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Project Specific Discussions => Filters/Equalizers => Topic started by: jsteiger on December 28, 2013, 05:42:40 PM

Title: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on December 28, 2013, 05:42:40 PM
Since the kits are finally ready to ship, it's time for the support thread!  :)

**This is a pretty easy build. A touch harder than a VP25, VP26 or VP312 but easier than a VP28 or Love Child. I recommend reading completely thru the Assembly Aid before starting on anything. There are some points made in the doc that can save you much time and prevent crucial errors during the build.

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September 21st, 2015 Update:
All support docs for this project can be found on the recently added Support Docs (http://capi-gear.com/catalog/support_docs.php) page at www.capi-gear.com
--------------------------------------------------------------------------------------------------------


Some details can be found here http://capi-gear.com/catalog/product_info.php?cPath=22_117_119_170&products_id=417

(http://www.capi-gear.com/catalog/images/gallery/capi_temp/temp-553F.jpg)

Cheers, Jeff
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: New Soul Rebel on December 29, 2013, 05:50:09 AM
 :P

Cor!
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: gar381 on December 30, 2013, 03:28:53 AM
CH 9 & 10 EQs in my Sphere/API sidecar!! :) :) :)

Thanks Jeff !!

GARY
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: gar381 on January 13, 2014, 02:02:15 AM
Just got my CH9 and CH10 pair for my Sphere underway!!! :) :) :)

These are Really Nice well thought out EQs kits with great build docs!!

Thanks Jeff.  DIYING to hear these guys. 8)

GARY

 
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kante1603 on January 13, 2014, 11:52:35 AM
Another ultra-sexy tool I bet,congrats Jeff!

Udo ;)
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Marc Duchesne on January 15, 2014, 08:33:59 PM
Received mine also yesterday... Will start built this week-end. Very nice packaging and parts from Jeff as usual. He is consistent. :-)
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on January 15, 2014, 08:44:57 PM
Received mine also yesterday... Will start built this week-end. Very nice packaging and parts from Jeff as usual. He is consistent. :-)
Thanks Marc. Can you please make sure you have the 3 and 5 pin right angle headers for the 2 filter boards. They should be in with the main PCB components. I missed them on the first shipment of kits but I think yours had them.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Marc Duchesne on January 18, 2014, 10:08:35 AM
Thanks Marc. Can you please make sure you have the 3 and 5 pin right angle headers for the 2 filter boards. They should be in with the main PCB components. I missed them on the first shipment of kits but I think yours had them.

Yes Jeff, 1 X 3 pins right angle and 1 X 5 pins right angle header...

Thanks !
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: MM1100 on February 01, 2014, 04:45:29 PM
Jeff - great design and kit! I've used the API 553 in the past and adding the HPF is most useful in combination with the low EQ inductor (one cutting the other boosting). All I remembered from the original and then some!

Took me around 5hrs to complete - iPad with the assembly aid helped out greatly...

Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Marc Duchesne on February 01, 2014, 09:29:40 PM
My built... Very easy to built. Thanks Jeff.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: mdmitch2 on February 05, 2014, 09:40:07 PM
Recently finished a pair of these -- it was a fun build and not very difficult. Hardest part is the fiddly little screws and nuts...

A couple notes for anyone building one:

-I found that the resistors/caps/transistors on the discrete followers need to be installed flush to the board, and trimmed very closely as there's not much clearance between the two boards once installed.

-I almost forgot to solder the bourns pots once everything was fitted together and tested. (The instructions don't explicitly state to solder them, and I guess I was following along a little TOO closely).

These EQs sound great -- the three available bands are surprisingly versatile, and on most sources, can be pushed to extremes without sounding bad. LC53a's will be ordered soon for comparison.

Btw, I built these with gar2520's, but I'm going to order some gar1731's for comparison..... will report back.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kato on February 13, 2014, 08:12:08 PM
OK, that was a relaxing and enjoyable build. I'm not used to building things that are so well-documented. Thanks Jeff!

My pre-flight measurements came out OK, except one: On the A1 DOA, probes between "O" and "C" doesn't register anything on my DMM. Does this indicate a problem? There is no continuity between the two, but also no measurable resistance.  The A-2 DOA registers properly at 56.8Ω between O and C.

Actually, would 150MΩ be a problem? The DMM stays blank until I click up to the 200M range, and which point it reads 1.5.

What do you think?
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on February 13, 2014, 08:34:25 PM
You should be good to go.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kato on February 13, 2014, 10:41:49 PM
You should be good to go.

OK then! From postal box to boxed module in two leisurely weeknights. A nice change of pace from builds that have stretched on for months. I see more CAPI modules in my future...

(https://lh5.googleusercontent.com/-KfT3-s56l0s/Uv2MBkElejI/AAAAAAAACFU/f-EFcXtOQI8/s640/14%2520-%25201.jpg)

(https://lh4.googleusercontent.com/-XCEXrbMqPcE/Uv2MBnoArQI/AAAAAAAACFM/WRQ9cNCliGo/s800/14%2520-%25202.jpg)

Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Marc Duchesne on February 15, 2014, 10:51:57 AM
Here is a quick example of the 553F on acoustic guitar. Loving it so far. How musical this Eq is is very surprising. I will need another one for stereo operation. Great work Jeff !!!

https://www.dropbox.com/sh/1kzq1qioe1xsr7m/or4_0cs7a-
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kato on February 16, 2014, 07:14:50 PM

Calibration Q:

A 1k sine wave doesn't vary in volume at any point in the full 25T of the trimpot. Does that indicate a problem?
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on February 16, 2014, 07:28:54 PM
Are you using one of my Extension Test Jigs or a special XLR cable?
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kato on February 16, 2014, 08:40:37 PM
Are you using one of my Extension Test Jigs or a special XLR cable?

It's plugged straight into the rack.
EQ not engaged / bypassed.
Sine wave into the XLR jack unbalanced.
Output tapping off the clips identified in the help doc.

Is there something special about the test jig I need to emulate somehow? I saw it has a CMRR setting that needs to be "out."

Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kato on February 17, 2014, 07:20:16 PM

Thank you!  Cable built. Unit calibrated.

I cranked the sine wave through nearfields. It was nice to hear that tone disappear to complete silence as I turned the trimmer.  Thanks again for a great project.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: mdmitch2 on March 08, 2014, 04:44:57 PM
I made a crude recall sheet using one of the photos from the website... I'm sure someone could do better with 5 minutes and photoshop, but this will get the job done for me.

Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: spaceboss on March 31, 2014, 12:04:20 PM
Calibration questions

This is a really well put together kit, and has been an enjoyable build so far.

I'm getting close to the calibration step on my build. I've built the test jig, and looked for precise instructions on how to use it--without any luck.

I'm still not confident that I know what to do. I know how to send the appropriate test tone out of my daw and into the XLR input on the chassis.

Where I get fuzzy is the output. From the picture on step 5 of the Final adjustments, I see the two yellow alligator clips and I know where to put them.

My questions are:

1. Is it just one alligator cable that is jumpering the positive end of C2 to the resistor?
2. If not, where do the other ends (not pictured go)? To get the signal back to my DAW do I use the XLR out on my chassis, or do I take the output from somewhere else?

Thanks.

All the best,

James
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on March 31, 2014, 12:48:50 PM
James, the instructions for using the Extension Jig are written in the silk on the jig's PCB. As for monitoring the output, you will clip onto the points shown in the pic linked in the Assembly Guide. The output signal will be unbalanced and need to go directly to your convertors and into your DAW. The positive lead will clip to the cap shown and go to pin 2 of your convertor's XLR. The ground connection is being made by clipping onto the end of the R shown in the pic. That will go to pin 1 of your XLR. Pin 3 will float and have no connection.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kato on March 31, 2014, 12:49:15 PM
James, that's not a jumper. It's two separate test clips that both happen to be yellow.

http://www.classicapi.com/catalog/images/553F-build/553F_assy_aid_29.jpg

The one going to the electrolytic is the audio out + and the one on the resistor is the audio out -.

edit: whoops Jeff beat me to it.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: spaceboss on March 31, 2014, 01:02:31 PM
Thanks Kato and Jeff!

That is much more clear now.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: pitol678 on April 02, 2014, 03:39:44 PM
Hi, I am just wondering about how difficult and what equipment is needed in order to learn how to calibrate the 553 (and other kits). I'm fairly handy and Ive put together some of the simpler kits but I don't even know where to start to learn this skill. Maybe that's my answer?

Any resources anyone could point me to would be much appreciated, thanks!
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kato on April 02, 2014, 03:51:14 PM
Hi, I am just wondering about how difficult and what equipment is needed in order to learn how to calibrate the 553 (and other kits). I'm fairly handy and Ive put together some of the simpler kits but I don't even know where to start to learn this skill. Maybe that's my answer?

Any resources anyone could point me to would be much appreciated, thanks!

Needed: An XLR jack, two resistors, and some wire.  :)

Follow the instructions on making a "special cable" (page 2 of this PDF) (http://www.classicapi.com/catalog/images/gallery/LC53A/Build-docs/VC528-ST2-CMRR-Adjustment.pdf) - but not the rest of the instructions as it applies to a different module. But instead go back to the 553 build manual for how to calibrate.

I output the module straight to powered monitors and listened to the sine wave blaring in the room while adjusting the trim pot. Enjoy!
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: pitol678 on April 02, 2014, 03:58:00 PM
Thanks Kato, Really??!? that seems really simple unless I am misunderstanding. So I dont need a sine wave meter, just my ears?
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kato on April 02, 2014, 04:03:15 PM

You just turn the trimpot till the sinewave disappears. It's very obvious when you've hit the perfect spot because as you continue to turn it, it gets louder in either direction. It's the "common mode rejection" setting so it's bucking out noise that's equal in both lines - in other words, sound that's not supposed to be present in your audio signal but gets picked up the electromagnetic interference and other junk.

You don't even need a sinewave generator. I found a free sinewave generating app and output via miniplug from my laptop into my "special cable" into the 553F.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: spaceboss on April 02, 2014, 11:46:47 PM
Okay. My unit powers up, but will not pass audio, regardless of whether the eq is in or out. So likely there is a short somewhere maybe? I'm regretting not buying pre-made op-amps, so I could rule those out. Is it too late to do so once a kit has been purchased?

My pre-flight measurements all exceed the measurements that they should exceed. Some of them appear to substantially exceed them. I'd be happy to provide pictures, voltage measurements or anything else that could be useful. I have an unbalanced audio probe that I've used for de-bugging guitar pedals.

This was my third 500 series project, the other two fired right up--so I guess as a relative newb I was due for a trouble shooting adventure.

If anyone has any advice on where to start or what to check, I would genuinely appreciate it.

All the best,

James
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 03, 2014, 12:24:41 AM
Do you have other opamps from your other modules? That is always the first thing to rule out, after rack slot, associated cabling and converter settings.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kante1603 on April 03, 2014, 12:28:29 AM
Hello James,

welcome to the forum.
To rule the doas out tear them out and do the initial voltage checks.With your dmm set to dc put the black probe to a 0vdc point (the audio/psu ground) and check the voltages at the doas sockets.
What do you get?
Jeff has preassembeled doas at his shop btw.,if that helps.
I didn't get what you meant saying all measurements exceeded what was to be expected.Did mean supply voltages,right?

Let us know,

good luck,

Udo.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: spaceboss on April 03, 2014, 12:45:08 AM
Do you have other opamps from your other modules? That is always the first thing to rule out, after rack slot, associated cabling and converter settings.

Hi Jeff. My other units use 990s. Would those work as drop in replacements for 2520s? They have the same pin configuration. Rack slot and cabling have been ruled out.

Udo thanks for the welcome. In the build guide there are instructions for measuring resistance across the Op-amp sockets while the unit was unpowered. That's what I was referring to.  I'll post the exact resistance measurements in case anything sticks out. I'll also test the voltages at the sockets per your suggestions tomorrow after work.

I appreciate both of your responses, I know your time is valuable.

James
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 03, 2014, 09:55:57 AM
Yes you can swap in 990's. They will run fine in both spots of the 553F.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: spaceboss on April 03, 2014, 08:02:47 PM
Well it was definitely an opamp. It works fine with the 990s.  ;D I did manage, to break off a millimax pin on a good opamp though.  :o It's a good thing I'm not a brain surgeon.

On the plus side I know which opamp was funky, I'm going to reflow the solder and see if that helps.

Thanks for the help!
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 09, 2014, 03:45:07 PM
I just modified the instructions.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: spaceboss on April 10, 2014, 12:17:57 PM
I got mine up and running last week.

This a beautiful sounding Eq. The high-pass, low-pass and subtle wide band bumps are great for tracking. Just the right amount of knobs for quick-good decision-making.

My op-amp mistake was one that I can put in the long--make this mistake only once file.  8)

While putting together a hybrid amp to act as a place holder for the 2520--it dawned on me that the voltage regulators are not the same part and are not interchangeable.  ;D (It would have occurred to me earlier with a more thorough read of the BOM.)

So after some fun times with a desoldering pump and braid, I was able to set things right. It's good to know my soldering skills weren't the culprit--only my ability to carefully follow directions.  :o

Thanks for the fantastic kit and Eq!
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 15, 2014, 12:20:33 AM
Hello,

Long time builder (destroyer) -first time poster!

I hoping someone can help me with this - Just got done with a 553F (awesome build!) and was preparing to calibrate. (The *Pre-Flight Measurements* checked good,  all V+/V- were 150kOhms+- and C>O on A2  was 55ohms...)

Installed the OpAmps (2 SL red dots), plugged in the jig, (CMRR switch off- EQ out)

Anyhow, I had the 553F in the powered-up jig for maybe  a minute or so as I was looking for a BNC>alligator to hook to a freq gen when I noticed that the transistors on the A2 red dot were *really* cooking! I know they sometimes can feel a little warm but in this case I could barely touch them without permanently branding a SOT-package profile on my thumb.

I switched the SL's with some known-to-work GAR2520's- same deal.

Specifically it's the MJE172 (reddot) and the BD140 (gar2520) that are really baking.

Obviously -I've unplugged the whole thing and haven't continued the calibration...

This can't be normal? Just for the sake of comparison- I've just fired up some VP28's and a LC - and the transistors in those are a little warm but *nothing* remotely close to this & frankly I don't wanna go any further and discover I've just deep fried some DOA's!

Anybody know what this could be?

!Thank you in advance for any guidance or advice!

Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kante1603 on April 15, 2014, 12:43:46 AM
Hello and welcome to the forum.

With no Doas installed I'd check the dc voltages at the sockets first,maybe the psu ground is gone for some reason?
Also are the voltages on the test jig o.k.?

Best regards,

Udo.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 15, 2014, 01:10:26 AM
With no Doas installed I'd check the dc voltages at the sockets first,maybe the psu ground is gone for some reason?
Also are the voltages on the test jig o.k.?

Thanks Udo,

The DOA sockets show +/- 15.4vdc at V+/V- both A1 & A2.

Jig seems ok - tests identical to the actual card edge connector

I've had the 553F mounted directly in a BAE rack-...(A2)DOA  still really *hot*

?

Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 15, 2014, 09:57:20 AM
Can you desolder all of the leads for the 2503 and measure the DCR of each winding? Set your DMM to a range of less then 100 ohms.

That would be:
red to brown
orange to yellow
green to blue
violet to gray
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 15, 2014, 12:18:16 PM
Can you desolder all of the leads for the 2503 and measure the DCR of each winding? Set your DMM to a range of less then 100 ohms.

red to brown= 8.5ohms
orange to yellow= 8.5ohms
green to blue= 8.5-  8.6ohms
violet to gray= 8.5 - 8.6ohms

I do have several 2503's around- just checked a couple for comparison- it would appear that the tranny in question is fine. Same DCR as the other 2503's...


Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 15, 2014, 12:27:54 PM
Yes this is correct.

Can you measure the DC offset around the opamp in question? The red probe to the positive end of C11 and black probe to a solid ground reference. DMM set to measure DC voltage.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 15, 2014, 12:35:14 PM
Thanks Jeff,
Should I re-solder the 2503 before doing this?
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 15, 2014, 12:46:36 PM
Yes. What load is coming after the EQ? At the output?
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 15, 2014, 04:00:37 PM
Yes this is correct.

Can you measure the DC offset around the opamp in question? The red probe to the positive end of C11 and black probe to a solid ground reference. DMM set to measure DC voltage.

Am I doing this with the op amps installed? With the jig attached/powered-up?

You'll have to forgive all my dullard questions...(however, what I lack in troubleshooting know-how- I make up for in test equipment)



Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 15, 2014, 04:30:29 PM
Yes, opamps installed, unit under power. Set the jig for normal conditions so CMRR switch out.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 15, 2014, 04:49:03 PM
...assuming that I'm doing this correctly

The + side of C11 is -5.4vdc ( it's fluctuating up to -5.5vdc and back)


Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 15, 2014, 05:39:17 PM
OK that is a pretty big problem. It should not be more than a few mV typically less than 100mV. I would check all of the components around this opamp. Something might have gotten misplaced in the audio path.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 15, 2014, 08:56:05 PM
I just went over the whole thing 3 times, re-tinned all solder joints,  (*all* of the passive components on the main PCB are identical to the BOM/overlays... I can't find anything wrong?)-

I then  pulled all the resistors and caps surrounding the DOA, checked them (all well within range) and put them back in the circuit. (sheesh!...after pulling the 2503 & the passive components this PCB is beginning look a little sorry...)

Anyhow, I put it  back in the jig...same thing.... **way hot op amp**!   :'(

I did (very quickly) shoot a test tone thru it- it's not passing audio at all (a little "tic" when engaging the EQ-in button, but that's it)

Anybody have any other suggestions? I do have a scope, etc. here. ANYTHING?

 I'm just not sure how safe it is to leave the thing powered up while testing it? I'd rather not cook the DOA's (or anything else!)

Thanks Jeff for all the help!

 
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 16, 2014, 12:49:07 AM
Hi,

I quickly just put a 400hz tone thru the jig>553F and speed-probed it with a scope, the last points I can pick up a 400hz signal is R9/C8 & the +/- & o pins on the A1-DOA.

Dunno if this helps?


Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 16, 2014, 09:58:11 AM
I will create a test points PDF but it will take me a day or 2. I have more open orders than I can get packed on today's agenda. I will post it ASAP though.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 16, 2014, 10:51:03 AM
What opamp is this? Was it built from a kit? These symptoms point towards the opamp. Is it installed correctly? http://classicapi.com/catalog/DOA_Install.php (http://classicapi.com/catalog/DOA_Install.php)
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 16, 2014, 02:37:03 PM
Hi Jeff,

2 SL Red Dots.   

I've also swapped out a bunch of other known-to-work GAR 2520's and 1731's from 4 different VP28's that have been humming along perfectly for a year or so....

That's what so moderately haunting about this...it really should be something somewhat obvious ( and seriously- I've gone over the PCB more times than I can count at this point...retinned 2X, bla,bla,bla)

I'm starting to feel like Gene Hackman at the end of "The Conversation" (forgive the ref )


Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 16, 2014, 03:01:41 PM
Hmm yeah it is odd.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 16, 2014, 04:17:39 PM
Mishegas, can you please post a few pics of the component side of the 553F PCB in question?
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 16, 2014, 05:59:07 PM
Here are some pics, sorry if it looks a bit messy (I pulled all the A2 surrounding components and tranny to test o.o.c.) I also tried to show it who's boss with some rosin/flux remover last night...

!!also!! I was checking the resistance on the sockets per your "pre-flight" instructions (for the 10th time) - I just happened to have the continuity "beep" on.
Are C and O sockets on A-2 supposed to be connected?...(55ohms) cuz they beeped!

Hope these are ok
 
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 16, 2014, 06:00:56 PM
and another
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 16, 2014, 06:02:51 PM
finally
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 16, 2014, 06:43:18 PM
Well, nothing is jumping out at me. Yes 55 ohms between C and O is correct. I am still thinking it may be 2503 related. Since it is all soldered in, please measure DCR between gold fingers #2 and #4 with the EQ not in a rack. It should be appx 25 ohms.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 16, 2014, 07:19:36 PM
24.8 ohms on #2 and #4

I'm not sure if the pads are gonna take another tranny pull, but do you think I should just clip the leads and wire in another tranny? (w/heatshrink...PITA but, oh well...)
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 16, 2014, 07:51:16 PM
No don't pull it yet. It was just a thought. I'll get back to you hopefully tomorrow with test points thru the circuit.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 16, 2014, 08:41:15 PM
Thanks so much Jeff!

Please get some sleep!
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 16, 2014, 09:58:26 PM
You did say it was A2 getting hot right?

Measure DCR from gold finger #2 to gold finger #5. It should read open with no measurable resistance.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 16, 2014, 10:21:46 PM


Yes A2....and more specifically it's the MJE172 (reddot) and the BD140 (gar2520) that are really hot.

According to Fluke

PIN#2  to PIN#4 = 24.8 ohms
PIN#2  to PIN#5 = OL (open)
PIN#1  to PIN#5 - 10 ohms
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 16, 2014, 11:10:11 PM
OK this is all good.

I will dig in tomorrow and work on the test points.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 16, 2014, 11:53:46 PM
Thanks  so much, Jeff

I've got some family/holiday stuff starting tomorrow so no rush. I really won't be back at the bench in earnest until Sunday. I'll be darned if I can't stop thinking about it though!
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 17, 2014, 01:18:27 PM
I have just added a Test Points pdf to the first post of this thread at the bottom of all the support doc downloads.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: michaeltgatto on April 18, 2014, 08:08:56 PM
This site helped me figure out capacitor values.

http://www.electronics2000.co.uk/calc/capacitor-code-calculator.php
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 22, 2014, 12:40:32 AM
Hey Jeff,

First, thanks for the test points PDF....

Second, I hooked the 553F to the jig w/ test tone and started probing...

#1 600mV
#2 600mV
#3 ...here's where my continuing 553F nightmare gets a little worse - ( I'm still a bit groggy from a red-eye flight last night...shoulda waited til tomorrow...) - I managed to fry something while probing + on C19 - I think the probe hit a resistor on the A3 follower... heard a little *tic* and smelled that smell. In any case the Fluke started @ 14V and ranges down to 1.1V. God knows what blew? no sign of a frying....?

needless to say I tested thru to #5... same deal as #3

I pulled A3 and A4, which *looked* ok, pulled & tested the 5087 and TIS97 from A3 which didn't show any shorts on a Peak Atlas (as well as pulling and testing c19 which came up fine)

Thought I'd post B4 I bust out another puck of solderwick...

I'm open to ANY suggestions....

OY!
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: sharpeleven on April 28, 2014, 11:26:59 AM
Just finished building two of these beauties! Great sounding EQs!

Everything works and sounds as expected EXCEPT that one of the units has a considerably lower output than it should (a difference of 19.3dB when measured from the DAW compared to the other). With a 4dBu (*) 400Hz sine wave  at the input the unit in question will only put out 0.134V.

Here the actual test point values:
TP1: 600 mV
TP2: 600 mV
TP3: 597 mV
TP4: 594 mV
TP5: 591 mV
TP6: 241 mV
TP7: 403 mV

here are Jeffs published target values:
600mV (after A1 receiver)
600mV (after HPF PCB)
596mV (after A3 follower)
594mV (after LPF PCB)
591mV (after A4 follower)
243mV (before A2)
413mV (after A2)

So it all seems very much in the zone, with TP7 being just 10mV lower than Jeffs on this unit. Not sure if that would account for the significant loss of signal? If no, wouldn't the only possible fault be somewhere around the output transformer? Maybe I have a faulty transformer? Any advice is highly appreciated!

Everything else works great, no noise, boost/cut identical to the other unit, sounds just a good as the other correctly working unit, just a lot softer at the output. I've triple and quadruple checked all wiring at the transformer and all looks correct. I did sucessfully calibrate the unit according to the instructions.

(*) actually 2.219V, which is as close as I can get my plugin based signal generator to output 4dBu (should be 2.227V)...
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 28, 2014, 11:50:52 AM
Sharpeleven, scroll back a few posts and you will see some tips on how to check the 2503.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: sharpeleven on April 28, 2014, 02:49:43 PM
Can you desolder all of the leads for the 2503 and measure the DCR of each winding? Set your DMM to a range of less then 100 ohms.

That would be:
red to brown
orange to yellow
green to blue
violet to gray

red to brown: 8.4 Ω
orange to yellow: 8.3 Ω
green to blue. 8.3 Ω
violet to gray 8.3 Ω

thanks!!
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 28, 2014, 03:34:30 PM
Those are right so far. Measure from one lead from each winding to the other windings to make sure there are no internal shorts anywhere. The only combinations that should have measurable DCR are the winding pairs in the quote you copied.

BTW, have you tried swapping rack slots and checking all cabling and convertor settings?
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: sharpeleven on April 28, 2014, 04:16:37 PM
Thanks for your help, Jeff!

Yes, equal conditions for both units as I'm just swapping them using one of your jigs here at the bench.

Following your directions I do measure the following additional resistances:

yellow to violet: 8.4 Ω
grey to orange: 8.4 Ω
grey to yellow: 16,7 Ω
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 28, 2014, 07:24:42 PM
Well, the best thing is to start from scratch measuring DCR of the 2503. The 16.7 ohms could mean something is shorted or 2 other leads were touching.

So, measure each and every lead to all other leads and write down the results. Make sure that none of the leads are touching each other. Only report back with any color combos that have resistance.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: sharpeleven on April 29, 2014, 08:10:22 AM
ok, latest results are in confirming prior measurements. I checked again all possible combinations as you requested, same procedure as first time. It's a pretty straight forward operation, so I'm pretty confident we can rule out any user error on my side. Sure never hurts though to think twice before sending iron across the atlantic...  ;)

I actually found one additional resistance between orange & violet (of just 0.01 Ω) that I must have missed the first time. Prob. meaningless - just mentioning it for sake of completeness.

List of all measurable resistances:
brown - red: 8.3 Ω
orange - yellow: 8.3 Ω
orange - violet: 0.01 Ω
orange - grey: 8.3 Ω
green - blue: 8.3 Ω
violet - grey: 8.3 Ω
violet - yellow: 8.3 Ω
yellow - grey: 16.7 Ω

all other combinations do not produce any measurable resistance.
thanks!
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 29, 2014, 09:47:53 AM
Well there is the problem. Orange and violet are shorted internally causing the 16.7 reading from yellow to grey. None should have measured 16.7 since that indicates 2 windings in series. That told me that either two other leads were touching during that measurement or there was an internal short. I did not doubt your abilities  ;)

Can you email me with your real name and I'll send you a 2503 today. jsteiger1965 at yahoo

Glad we found it and sorry for the trouble  :-[
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: sharpeleven on April 29, 2014, 01:51:43 PM
Thanks for your effort and time! Will email you shortly...

No offense taken anywhere whatsoever - I'm a complete noob and know nothing, trust me! ;D  just trying to be verbose enough to try'n compensate for my complete lack of precise tech-lingo and help the process to best of my abilities. Hope I didn't waste anyone's time by taking up all that bandwith.  8)
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 30, 2014, 12:55:21 AM
Greetings!

Whatever the hell I shorted while probing the test points seems to have led to a solution to my previous problem (for quick reference, my 553F was NOT passing audio as well as overheating the A2 DOA)

I pulled both discrete followers, pulled all DF components, resisitors and caps tested fine, BOTH 2N5087's were fried, as well as a TIS97* being shorted, so I replaced ALL transistors in both DF's and put it all back together, clamped on the test jig, and *bingo*! Passing audio! And no roasting OpAmps!

Not being in possession of a proper schematic- I'm incredibly curious if the DF transistors could have been causing THAT much mayhem?

Anyhow, I haven't hooked up the sig gen and shot a 400hz through it yet....but I'm feeling somewhat lucky that this somehow (and apparently inadvertently) solved this problem! However I'm also a bit upset that I really can't be sure what the initial problem was!, and exactly what fixed it?...(again, I haven't tested/calibrated yet...)

*my girlfreind's minimoog is FULL of 'em!  ;)



Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kante1603 on April 30, 2014, 01:58:11 AM
Slaughtering a minimoog..........you sir are a monster.....
Glad the issue is solved.

Udo.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 30, 2014, 11:56:17 AM
TIS97*
*my girlfreind's minimoog is FULL of 'em!  ;)


Slaughtering a minimoog..........you sir are a monster....

Udo,

 I was just joking about my girlfriend's minimoog...

.....the truth is; I don't have a girlfriend.
 :( ;)
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kante1603 on April 30, 2014, 04:52:41 PM
Udo,

 I was just joking about my girlfriend's minimoog...

.....the truth is; I don't have a girlfriend.
 :( ;)
;D
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Mishegas on April 30, 2014, 10:04:18 PM
Just did the calibration and the test points....

It would appear that I'm in the ballpark?...I believe my 400Hz signal is a wee bit hot. -602mV at the card edge connector-so.....

........Jeff's.......................................Mine               
-------------------------------------------------------
#1, 600mV (after A1 receiver)...........602mV
#2, 600mV (after HPF PCB)...............602mV
#3, 596mV (after A3 follower)...........599mV
#4, 594mV (after LPF PCB)...............595mV
#5, 591mV (after A4 follower)...........592mV
#6, 243mV (before A2)....................243.2mV
#7, 413mV (after A2).......................413.7mV

considering the slightly hotter signal, do these look proportionally ok?

Thanks everybody for all the help and kind attention!
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on April 30, 2014, 11:15:07 PM
Yes those seem fine.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: MPCNYC on May 05, 2014, 01:16:00 PM
Hey Jeff,

Just finished the first of two 55F kits and all went well.....my usual process of having to fiddle a bit with the metal work to get things to line up, but that wasn't bad at all. Thanks again for a wonderful product! Insanely cool tone shaping EQ. I've built upwards of 25 of you kits to date and they are all running just perfect. The mid band is super sweet sounding!

I'd love to hear from you or anyone else with experience with 553F with regard to opamps. I had some GAR1731's around so that's what I put in the unit. Just wondering what people's preferences were and what the character of the Liebers, GAR2520, etc, imparts on the the sound of the 553F!?

Thanks again!

Michael
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: pitol678 on June 06, 2014, 11:23:01 AM
Super stoked! finished this build today and it was my first unit that I had to calibrate which I had been so intimidated by. However, I got the Extension jig from CAPI and it simple and everything worked right out of the gate. Thanks Jeff, cant wait to start using this!
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Matt D on July 16, 2014, 03:05:03 AM
I finished a pair of these recently and have been using them for tracking EQ's.  The bands are nicely voiced so if I'm thinking "I'd like a little more high end out of that acoustic guitar" and I bump the HF knob up a little bit and it sounds like what hear in my head only better. Same goes for the bass and mids. Easy build and great documentation.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: turk sanchez on November 23, 2014, 09:04:42 PM
...hey guys, just starting a build here (doing a pair of these 553f EQ's) ~ just finished the high pass filters, low pass filters and discrete followers. Just thought I'd share a pic. Build is a breeze and having fun so far:)

Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: turk sanchez on November 25, 2014, 08:34:05 PM
...another pic. I just have to do final assembly on the other one and then calibrate them. Really nice kit.

I had a little trouble getting a few of the sockets for the DOA's to heat up and flow, so per Jeff's advice, I turned up the heat to over 800 (I went to 850) and that helped. Some of the pads are pretty small (especially on the discrete followers) but there is a good deal of room between pads so it was actually pretty smooth. Really excellent BOM (printed in "stuffing order"). I can't wait to hear this.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: turk sanchez on November 26, 2014, 03:40:38 PM
I LOVE 'em!!! Just finished. They sound incredible. THANK YOU, Jeff! Amazing kits.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Flukes on June 26, 2015, 09:29:17 AM
Hi guys,

At the first stage of calibrating this bad boy, the unit is passing signal but it's super quiet.

Where would you suggest to start with troubleshooting?

Best.
Mat
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on June 26, 2015, 10:07:39 AM
So is the CMRR trimmer calibrated or not? The first stage is a -6dB receiver so under normal (not CMRR test/cal) conditions, whatever balanced signal is applied to the input, at the output of the first opamp should be appx 6dB lower.

As always, what opamps are you using and who built them? Possible bad opamp builds are the FIRST thing to rule out.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Flukes on June 27, 2015, 05:48:36 AM
Hey Jeff,

I'm using pre-built red dots bought from you so I've ruled those out.

Could you explain the CMRR trimmer calibration further?

I should also mention I'm using one of your 51 test jigs for the calibration.

Best.
Mat
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on June 27, 2015, 10:21:16 AM
Basically you are inject the exact same signal into the inverting and non-inverting inputs of the receiver opamp. Because they are of opposite polarities, in a perfect scenario they would cancel out fully within the opamp and the output of the opamp would be nothing. Since perfect is not achievable we look for the lowest possible output from the opamp. The trimmer is on the input side of the amp and ever so slightly adjusting the signal going to the non-inverting input for as close to possible perfect null within the opamp.

Once this adjustment has been made, you can disengage the CMRR test switch on the Extension Jig. The level measured at the output of the opamp (same spot we monitor for CMRR) should be approximately 6.1dB lower than the signal level at the card's input.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Flukes on June 30, 2015, 04:50:02 AM
Hi Jeff,

Are you talking about the tiny knob at position RV1? Adjusting this knob is doing zero to the output level.

The output is reduced by 20dB when fed through the 553F.

Also, I've used your extension jig with a DIY RE Colour and the output only changes slightly.

What else would you suggest?

 
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on June 30, 2015, 06:36:34 PM
Hi Jeff,

Are you talking about the tiny knob at position RV1? Adjusting this knob is doing zero to the output level.
Yes but they will not change the output level of the entire module by very much when in standard operating mode. The RV1 trimmer is ONLY turned when you are adjusting for CMRR as described on the side of the Extension Jig.

Quote
The output is reduced by 20dB when fed through the 553F.

What else would you suggest?
Swap opamps around first. If they are pre-built they should be fine. It could be an issue with one of the discrete followers. You could also have some R's swapped around and in the wrong places. Cold solder joints are also a likely cause.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Flukes on July 05, 2015, 09:13:40 AM
Cheers Jeff,

Before I get stuck into checking all of the components, I just double checked the pre-flight measurements and for both A1 and A2 (between  +V/-V and C) the resistance is less than 100k.

Also, interestingly the resistance of A2 (between O and C) is 55k but A1 is less than 100k.

Does this ring any alarm bells for you?

Best.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on July 05, 2015, 10:52:34 AM
No bells. These are all fine. We are basically looking for direct shorts when checking the voltage rails.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Flukes on July 05, 2015, 08:08:10 PM
Ok good, how do I do that?
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on July 05, 2015, 08:53:21 PM
Ok good, how do I do that?
Sounds like you did it above by measuring DCR between the opamp V pins and ground.
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Flukes on July 05, 2015, 11:22:53 PM
So the incorrect pre-flight measurements I'm getting from my 553F have nothing to do with the reduced output?
Title: Re: [BUILD] Classic 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on July 06, 2015, 10:47:03 AM
If you mean the DCR from the opamp voltage pins to ground, then no. We are mainly looking for a direct short or close to it in that measurement. Reduced output can be from a bad opamp build, problem on discrete follower(s), resistor(s) placed incorrectly or bad solder joint(s) somewhere throughout the build.
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: NoahShain on October 09, 2015, 11:07:51 AM
I've noticed there's a spot on the main pcb for hi-z/low-z jumpers but none are included in my kit or in the assembly aid.

Ignore?
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on October 09, 2015, 11:34:45 AM
I've noticed there's a spot on the main pcb for hi-z/low-z jumpers but none are included in my kit or in the assembly aid.

Ignore?
Yes ignore. Same goes for the 2 related R's. I have them listed in the BOM as such.
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: NoahShain on October 26, 2015, 10:16:27 PM
So I have my special cable built.
Probes Are in the right spots.  Moving rv1 trimmer creates no change at all.
Tell me it's something simple...
Signal generator to special cable to input...
+probe at the + terminal of C2 to pin 2 of the xlr
- probe at R11 is connected to pin 1 of the xlr
Pin 3 is floating
Xlr to patch bay DAW input.

Is this right?
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: NoahShain on October 26, 2015, 11:04:38 PM
I just checked and re-checked everything. All 4 of the 553fs I built are not responding to the cmrr cal. Turning the rv1 trimmer does nothing.
I rebuilt my monitoring cable so that pin 1 is ground, pin 2 is + and pin 3 is - 
On the probe end of the cable I have red (+) on pin 2 and - and ground both on black (-) probe.

Am I making some newbie blunder?

Total newb here and stumped.
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on October 27, 2015, 12:57:53 PM
Hi Noah, sorry you are having trouble. If you are using my Extension Jig, you do not need a "special cable". The Extension Jig takes care of that. All you need to do is engage the pushbutton switch during CMRR adjustment. The instructions printed on the silkscreen of the Extension Jig PCB should get you there. If you are using the jig AND a special cable, that could be your trouble?
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: NoahShain on October 28, 2015, 04:00:08 AM
Hi Noah, sorry you are having trouble. If you are using my Extension Jig, you do not need a "special cable". The Extension Jig takes care of that. All you need to do is engage the pushbutton switch during CMRR adjustment. The instructions printed on the silkscreen of the Extension Jig PCB should get you there. If you are using the jig AND a special cable, that could be your trouble?
Thanks for the reply Jeff. I bought an extension jig but I botched the build! I broke the ribbon cable connectors trying to clamp down on the ribbon cable. I was gonna order a new one last night but the store was closed so I just made everything.
It's entirely possible I have made other mistakes...
*facepalm*
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: NoahShain on November 02, 2015, 10:02:49 AM
Thanks for the help Jeff. So assuming my test cable is correctly built, is my test procedure correct?
 Does it sound as if my test cable must be incorrectly made?
Ugh
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on November 02, 2015, 10:24:31 AM
You should be able to measure with your DMM at the output end of the special cable to make sure it is functioning properly. I mention this in the doc about building the cable. You should be able to adjust the output of your sig generator to give you appx 1V AC at both pins 2 and 3 of the output XLR.
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: NoahShain on November 05, 2015, 02:14:27 PM
You should be able to measure with your DMM at the output end of the special cable to make sure it is functioning properly. I mention this in the doc about building the cable. You should be able to adjust the output of your sig generator to give you appx 1V AC at both pins 2 and 3 of the output XLR.
Yep! The cable is measuring correctly. Got 1v at the output.
Rv1 still doesn't affect the signal.
I built the xlr with alligator clips so I could clip in as described in the doc and feed directly to my daw. Am I supposed to be taking the output from the 500 series chassis instead? The normal output xlr jack?
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: andycallison on November 08, 2015, 11:03:54 AM
a friend has just handed me one of these bad boys, i've had nothing to do with the build.. i plug her in and she works and eq sounds great, but there is a huge loss in volume when in line.. where do i start trying to fault find this bad boy.. cheers
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: andycallison on November 20, 2015, 12:07:57 AM
I've read what jeff is saying to Flukes and this is giving me little idea of where to start.. to be honest my knowledge is very limited.. it all sounds like gobelygook! any help very much welcome.. cheers
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: andycallison on November 25, 2015, 04:22:59 AM
so i have tested all the resisters that are on the pcb.. there seem to be a few issues

R2 should be 130k and its 11.75K
R3 should be 13k and it's 11.75K
R10 should be 14.3K and it's 4.1K
R14 should be 10K and it's 4.83K
R15 should be 10K and it's 4.11L
R20 should be 2M2 and it's 5.92K
R26 should be 220K and it's 199R

i also did the test points...

1.  5.7Mv
2.  5.6Mv
3.  53.5Mv
4.  2.6Mv
5.  56Mv
6.  .6Mv
7.  .2Mv

so none of those seem to match either!! any advice would be greatly appreciated

cheers

Andy
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on November 25, 2015, 05:29:56 PM
so i have tested all the resisters that are on the pcb.. there seem to be a few issues

R2 should be 130k and its 11.75K
R3 should be 13k and it's 11.75K
R10 should be 14.3K and it's 4.1K
R14 should be 10K and it's 4.83K
R15 should be 10K and it's 4.11L
R20 should be 2M2 and it's 5.92K
R26 should be 220K and it's 199R

i also did the test points...

1.  5.7Mv
2.  5.6Mv
3.  53.5Mv
4.  2.6Mv
5.  56Mv
6.  .6Mv
7.  .2Mv

so none of those seem to match either!! any advice would be greatly appreciated

cheers

Andy
Andy, resistors cannot be accurately measured when they are soldered in circuit. The results will vary. If you are really questioning their values, either use the color codes or one end must be desoldered and lifted from the PCB before measuring.

Did you eliminate opamps? From what you posted, your signal is not getting past the receiver stage so no need to test further. Who built the opamps? Have they been tested in something other than this build? Also, make sure your DMM is set for ACV when measuring audio.
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: andycallison on November 25, 2015, 11:18:22 PM
defo not the opamps.. they are red dot's bought built.. they work great in my vp28.. whats the reciever stage? that will help me know where i'm looking for faults.. cheers
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on November 26, 2015, 11:05:11 AM
The receiver stage is comprised of the A1 opamp and most of the components surrounding it all the way over to C2. If this stage is not operating in a -6dB capacity, (since it won't be the red dot) it will either be misplaced components or shoddy solder joints. The biggest nemesis of DIY projects by folks just starting out are bad solder joints. I would start with checking component placement and a good reflow of the solder joints. I just saw a project where a guy just starting out trimmed the leads so close to the PCB that he shaved the bottom of the pads and a few traces clean off the board. Just when I thought I had seen it all.....
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: NoahShain on February 09, 2016, 02:12:55 AM
Just finished my first LC53 build.
 :-\
Not passing signal at all...just a buzz. Like a nice loud 60 cycle hum.
Any tips where to start diagnosis? My instinct says the little op amps or followers...they're tough!

Thanks all
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: kante1603 on February 09, 2016, 06:16:23 AM
Just finished my first LC53 build.
 :-\
Not passing signal at all...just a buzz. Like a nice loud 60 cycle hum.
Any tips where to start diagnosis? My instinct says the little op amps or followers...they're tough!

Thanks all
Wrong thread.....
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: NoahShain on May 29, 2016, 12:25:00 PM
Jeff
Curious if it's possible to change the frequency points of a 553?
I love the sound of them and I'd like to customize a couple for specific jobs.
Would it be a matter of R values or something relatively simple or more complex than that?
Thanks
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on May 29, 2016, 08:09:09 PM
Jeff
Curious if it's possible to change the frequency points of a 553?
I love the sound of them and I'd like to customize a couple for specific jobs.
Would it be a matter of R values or something relatively simple or more complex than that?
Thanks
Changing the caps that are in series with the inductors will change the resonate frequency. It is very hard to lower the low band though. I assume you are after altering the mid band? The bandwidth will change since you are only changing the C. I would not go too far from what it is. YMMV.
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jasonallenh on September 22, 2016, 10:16:24 AM
Jeff,

The site is showing a quantity of zero... is there an ETA for these?
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on September 22, 2016, 11:46:13 AM
Jeff,

The site is showing a quantity of zero... is there an ETA for these?
I am still debating on if I am gonna restock. If I do, it will be after I launch the 3 new EQ's that are in the pipeline.
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jasonallenh on September 23, 2016, 02:54:35 PM
GASP! I was ready to pull the trigger on a pair... :'(
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jasonallenh on September 29, 2016, 09:02:54 AM
If I do, it will be after I launch the 3 new EQ's that are in the pipeline.

...and is there an ETA on this?

Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on September 29, 2016, 11:16:53 AM
...and is there an ETA on this?
I am right at the tail end of the build pics for the LC25 & LC40. Hope to have those listed at the store over the next few days. The BT50 will be a month or 2 behind. I need to get the parts sorted for those and complete the build guide pictorial.
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jasonallenh on March 24, 2017, 10:34:23 AM
Mr. Steiger!

I'm following up now that the BT is complete (which looks awesome, btw!!). Will we see the 553F returning?
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on March 24, 2017, 11:11:48 AM
Mr. Steiger!

I'm following up now that the BT is complete (which looks awesome, btw!!). Will we see the 553F returning?
Yes I am leaning towards it. I have been very preoccupied with DAWtomation as well as the new version of the FC526 comp. As soon as I get some breathing room there I will get the missing bits in for the 553F's. Hard to put a date on it though at this time.
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: k.steeze on September 07, 2017, 02:12:48 PM
Hey Jeff!  It's been a few months, casually checking in on the 553F.  I've been patiently waiting to get my hands on a pair  :)  I hope Dawtomation is coming along smoothly! 
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: jsteiger on August 26, 2018, 06:53:22 PM
Hey folks, just wanted to give an update that the new Rev B 553F kits are in stock at the CAPI store.

http://capi-gear.com/catalog/index.php?cPath=22_117_119_170
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: Maggot Brain on October 09, 2018, 07:09:15 PM
Working on my build and going great so far.

Quick question, re: installing the op amp sockets... it says in the build guide to install from the bottom...

Anyone using Louder Than Liftoff Rogue 5's in their builds?

I'm wondering if there will be enough clearance btwn the components and the PCB (the components are on the bottom (pin) side of the DOA), or would it be safer to install the sockets from the top instead?

Thanks in advance.

EDIT: For anyone interested, I took the chance and soldered the pins as instructed... Rogues Fives fit just fine.
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: artifactaudio on February 11, 2019, 01:25:20 AM
Hey all! New 553f user, long time builder/DIY'er

Curiously, I'm running into a wild problem on my first 553f Rev B build; PR6, the 10 ohm resistor on that (I believe) sits on the positive  keeps frying! I've replaced it, switch opamps to a known working one, and up in flames again! I'm hesitant to keep trying as I don't want to damage anything else, but I'm at a bit of a loss! Diodes+Caps on the PSU rails are fine, Transistors on the followers/DT07 are oriented properly,  I'm at a loss! Any help would be appreciated <3
Title: Re: [BUILD] CAPI 553F~500 Series~LC Equalizer~Official Support Thread
Post by: artifactaudio on February 11, 2019, 11:12:15 PM
Hey all! New 553f user, long time builder/DIY'er

Curiously, I'm running into a wild problem on my first 553f Rev B build; PR6, the 10 ohm resistor on that (I believe) sits on the positive  keeps frying! I've replaced it, switch opamps to a known working one, and up in flames again! I'm hesitant to keep trying as I don't want to damage anything else, but I'm at a bit of a loss! Diodes+Caps on the PSU rails are fine, Transistors on the followers/DT07 are oriented properly,  I'm at a loss! Any help would be appreciated <3

HAH, turns out the bottom of the voltage follower was too close to the body of the 2503 and shorting to ground. Got both 553f's working now, they sound incredible! Great job Jeff!