jsteiger

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #300 on: March 08, 2018, 08:54:32 PM »
R71 and R73 are good
R42 Not sure where to ground the O scope so using the ground point and no signal at R42
Post a quick pic of that part of the build.
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Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #301 on: March 08, 2018, 10:09:08 PM »
Post a quick pic of that part of the build.

jsteiger

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #302 on: March 08, 2018, 10:28:30 PM »
Did you check R42 closest to C17 or the other end?
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Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #303 on: March 08, 2018, 11:06:39 PM »
Did you check R42 closest to C17 or the other end?

Yes I did use the top of R42 closest to C17.

Using ground point for ground.
 
 
« Last Edit: March 09, 2018, 01:24:33 AM by 420troll »

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #304 on: March 09, 2018, 07:53:09 PM »
Waiting for a reply. Should i pull the transformer out and test?

jsteiger

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #305 on: March 10, 2018, 10:32:51 AM »
Waiting for a reply. Should i pull the transformer out and test?
Yes. You should measure the windings for DCR. That would be from pin-5 to 8, pin-1 to 3 and pin-2 to 4.
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Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #306 on: March 10, 2018, 02:33:19 PM »
Yes. You should measure the windings for DCR. That would be from pin-5 to 8, pin-1 to 3 and pin-2 to 4.

pin 5-8 = 1.698k
pin 1-3 =  64ohm . when testing here the meter jumps around at first for about 1 second then settles down. and measuring a few min later its 62.8ohms
pin 2-4 = 71 ohm

« Last Edit: March 10, 2018, 02:45:36 PM by 420troll »

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #307 on: March 10, 2018, 06:16:03 PM »
I put the transformer back in and tested everything again.
The signal good at R71 & R73.
No signal at R42 and ground.
 :P

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #308 on: March 10, 2018, 07:55:08 PM »
I put the transformer back in and tested everything again.
The signal good at R71 & R73.
No signal at R42 and ground.
 :P

With the transformer out I get 165.4ohms across pins 1 & 3 of the CA2622 location on the main PCB.

Transformer back in.

If I turn my O scope I can see this @ R42(yellow)
My noisy  sine on the  balanced input in blue @ 0.024vAC
This scope is not very accurate as far as voltages and frequencies.
Frequency & voltage  were measured with a true rms DMM

jsteiger

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #309 on: March 10, 2018, 08:58:50 PM »
The 2622 DCR looks correct.

Maybe you have the 2 transistors swapped immediately after the 2622?
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Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #310 on: March 10, 2018, 10:20:45 PM »
The 2622 DCR looks correct.

Maybe you have the 2 transistors swapped immediately after the 2622?

Q1 is a BC560
Q2 is a BC550

jsteiger

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #311 on: March 10, 2018, 10:24:51 PM »
Check DCV at the top of R36 and then R37. Check on the ends closest to R40.
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Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #312 on: March 11, 2018, 12:18:29 AM »
Check DCV at the top of R36 and then R37. Check on the ends closest to R40.

R37= -15.15vdc
R36= +15.13vdc

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #313 on: March 11, 2018, 01:35:10 AM »
Sorry I missed this.

Q1, BC560C:
C -15.43
B  -.588
E .046

Q2, BC550C:
C 15.14
B 0
E -.589


My values are very close

Q1, BC560C:
C -15.13
B  -.564
E .053

Q2, BC550C:
C 15.11
B 0
E -.564

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #314 on: March 11, 2018, 04:04:00 AM »
If I put in an AC sine1kHZ and  -6.1dbu or 0.380v than TP1 = -42.4dBu or appx 5.8mV AC
TP2 @ 0.161vAC
TP3 @  1.286vAC
output 2.57vAC  appx 10.4dbu
funny thing is in my DAW its -27db on its meter now
 :o
« Last Edit: March 11, 2018, 04:11:22 AM by 420troll »

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #315 on: March 12, 2018, 07:53:00 PM »
Whats the word O keeper of the schematics?  I have been waiting a couple of days to hear back what to do next.
 
Out of about  60 DIY kits from effects to synths including the ARP 2600 clone, samplers, drum machines this is the most painful support, at this rate I guess i will have a 500$(Canadian dollars the cost for me )distortion unit. I have never had a project I could not get going even faulty circuit designs i have help provide insight into what could be going wrong why do you make this so hard for me? Some hi res pictures and a schematic I am guessing I could tell you where the problem is.

 :-\

jsteiger

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #316 on: March 12, 2018, 08:16:58 PM »
Whats the word O keeper of the schematics?  I have been waiting a couple of days to hear back what to do next.
 
Out of about  60 DIY kits from effects to synths including the ARP 2600 clone, samplers, drum machines this is the most painful support, at this rate I guess i will have a 500$(Canadian dollars the cost for me )distortion unit. I have never had a project I could not get going even faulty circuit designs i have help provide insight into what could be going wrong why do you make this so hard for me? Some hi res pictures and a schematic I am guessing I could tell you where the problem is.

 :-\
I do not publish the schematic for this project. I never have. I am honestly lost as to where you are and what your problems are. I got the impression from your last post that something dramatically changed when you put it all back together. I do not have all of the test point data memorized so it would be helpful if you could post what you have vs what it should be.
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Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #317 on: March 12, 2018, 10:52:26 PM »
What test points would you like? all of them? I am stuck at TP.1= 0volts AC


BUT


If I put in an AC sine1kHZ and  -6.1dbu or 0.380v

My test TP1 = -42.4dBu or appx 5.8mV AC
MY TP2 @ 0.161vAC
MY TP3 @  1.286vAC
MY Output 2.57vAC  appx 10.4dbu

Your notes that tell me to "Apply a 1kHz sine wave @ -30dBu to the input."

So instead of  -30dbu i am putting  -6.1dbu thru to get the signal to TP.1




Your calibration notes
**Audio Path**
TP1 Immediately follows the balanced receiver opamp, just before the RV6 input pot. Signal
here should be 12.4dB lower than the balanced signal level at the input of the module.
TP2 Immediately follows the signal preamp opamp, just before the RV5 output pot.
TP3 Immediately follows the output opamp, just before the T1 output transformer. Signal level
here will be approximately 6dB lower than the module’s balanced output.
Audio Path Test: With the VVR FET fully out of conductive range (RV2 fully CW), turn both
input and output pots wide open or fully CW.

Apply a 1kHz sine wave @ -30dBu to the input. 

Why not include the volts AC above??

You should have the following:
TP1 = -42.4dBu or appx 5.8mV AC
TP2 = -16.3dBu or appx 117.7mV AC
TP3 = +1.73dBu or appx 939mV AC
Module’s Output = +7.75dBu

Basically it seems as all switches and knobs work meter responds but the sound is very thin unit seems to boost to the high frequencies and cut to the low frequencies on spectrum analyzer with white noise, triangle waves come out as squares on O scope
« Last Edit: March 12, 2018, 11:22:49 PM by 420troll »

jsteiger

Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #318 on: March 13, 2018, 10:49:27 AM »
You can monitor any of the 3 audio Test Points by listening or scope or whatever. If you have issues at TP1, the following audio TP's do not matter as it won't magically come back. I thought you said something changed but it seems that is when you put a higher level signal to the input which is not suggested anywhere. If your levels look fine at the input of the 2622 (R71, R732) and nothing at R42, then it still points to the 2622, which is odd. I have not had a bad one yet from this winder. Are you sure its orientated right? The outside mu-can ground wire should be facing the opamps.

You will have to pull it again and see if there is any shorting between windings. Also check from the signal pins to the outside mu-metal can. So make sure pin-1 only has DCR to 3 and not to 2, 4, 5 or 8 and also not to the outside of the can, rinse and repeat for all signal pins.
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Re: [BUILD] CAPI FC526~500 Series~FET Limiter Kit~Official Support Thread
« Reply #319 on: March 13, 2018, 08:41:47 PM »
Everything checks out with the 2622. After your tests  I also put a sine wave thru pins 1&2 together as + and  3&4 as - and it amplified and put the signal out on pins 5&8 fine

What about a picture of a working unit? Or I can send you more of mine besides the one in Reply #301