Trench Recordings

Re: EQN build thread
« Reply #600 on: July 13, 2014, 08:43:53 PM »
I emailed Peter. He has a few available now and another batch coming


fallout

Re: EQN build thread
« Reply #601 on: July 24, 2014, 12:32:07 AM »
I just put together my pair of EQN's.. One of them works fine and just needs to be calibrated. However, I'm having a problem with the 2nd one. The low freq switch doesn't have any effect on audio whatsoever. I've double checked the switch and looked for cold solder joints. I tested it with a meter to make sure the switch itself was working and I also swapped amp PCBs. Nothing made a difference! All other switches work fine.. Does anyone have a clue what my issue could be or other ideas on what i can check?

Thanks!

-jay

fallout

Re: EQN build thread
« Reply #602 on: July 24, 2014, 01:12:17 PM »
A good night sleep did the trick. Turned out that it was the jumper jrowell suggested to fix the LF response issue. Unsoldered the jumper and my LF switch worked. Re-soldered the jumper and all is still good! Although it looked fine to the naked eye, it clearly wasn't! ;)

-jay

Rob Flinn

Re: EQN build thread
« Reply #603 on: August 26, 2014, 04:08:57 PM »
On the droop fix, I understand that a wire needs to be connected in the green position.  What is the red wire on the photo ?  Is that something to ignore, or does a trace need cutting ?
regards Rob

duantro

Re: EQN build thread
« Reply #604 on: August 26, 2014, 04:33:16 PM »
On the droop fix, I understand that a wire needs to be connected in the green position.  What is the red wire on the photo ?  Is that something to ignore, or does a trace need cutting ?
The fix is to just jumper the green wire in the JRowell's photo a ways back. This is what I did and mine have been working great for a while.

Rob Flinn

Re: EQN build thread
« Reply #605 on: August 26, 2014, 04:45:24 PM »
Thanks
regards Rob

weiss

Re: EQN build thread
« Reply #606 on: September 06, 2014, 06:54:18 PM »
Got some in stock again?

Re: EQN build thread
« Reply #607 on: September 26, 2014, 02:54:10 PM »
http://www.lazpro.com
I reserve the right to not sell to idiots

Whoops

Re: EQN build thread
« Reply #608 on: January 30, 2015, 07:51:48 PM »
Hello Peter,
saw in your website that you are out of stock for EQN parcial Kits.

Would you make a new run if I run a Feelers list and have more than 30 orders in the list?

Thanks

Trench Recordings

Re: EQN build thread
« Reply #609 on: February 02, 2015, 03:27:14 PM »
Anyone know the part number for the 1MM pin sockets ? I'm missing 10 and need to order.

I tried some from CAPI but they are too large dia. to fit in the PCB.

Looks like i might a Harwin ? and not mil-max

Edit* - Thanks Peter
Newark/Farnell part numbers...
Pins 1336227
Skts 149-318 
« Last Edit: February 03, 2015, 01:20:32 PM by Trench Recordings »


Trench Recordings

Re: EQN build thread
« Reply #610 on: April 13, 2015, 07:16:11 PM »
I have a problem with one of my eqs. It works fine for about 4 or 5 hours then starts acting up. It starts to hum,  sometimes it starts as a slow pulsing hum and then becomes a constant hum.

Powering down for 15 mins seems to clear the problem and it will run clean for another 4/5 hours.

Ideas ? I going to start swapping opamps, DC/DC convertors and see if i can narrow it down

EDIT. I was the DC/DC convertor. Replaced it and all seems good
« Last Edit: August 21, 2015, 11:34:39 AM by Trench Recordings »

Whoops

Re: EQN build thread
« Reply #611 on: April 13, 2015, 08:01:21 PM »
Anyone know the part number for the 1MM pin sockets ? I'm missing 10 and need to order.

I tried some from CAPI but they are too large dia. to fit in the PCB.

Looks like i might a Harwin ? and not mil-max

Edit* - Thanks Peter
Newark/Farnell part numbers...
Pins 1336227
Skts 149-318

Can you enlarge a little bit the holes in the PCB to make them fit?

I use a small drill tool to enlarge the holes in PCB's, Works great.


late

Re: EQN build thread
« Reply #612 on: January 29, 2016, 05:29:30 AM »
Hi

Anyone knows where to get good looking knobs? Would like to get bit original look.


KDE

Re: EQN build thread
« Reply #614 on: August 31, 2016, 04:42:30 AM »
Looking for 1 more kit if anyone has a spare  :'(
Some things are best left unsaid

mysticmerlin

Re: EQN build thread
« Reply #615 on: November 01, 2016, 04:28:13 AM »
The website for lazpro has gone down and I was just about to finish 4 eqn's . Would anyone have a schematic or something similar (build notes/ calibration guide / Bom) to help me finish?
Thanks

qmp audio

Re: EQN build thread
« Reply #616 on: November 02, 2016, 02:36:07 PM »
The website for lazpro has gone down and I was just about to finish 4 eqn's . Would anyone have a schematic or something similar (build notes/ calibration guide / Bom) to help me finish?
Thanks

https://www.dropbox.com/s/b2gktw9aqvzltjr/lazeqn.zip?dl=0

wave

Re: EQN build thread
« Reply #617 on: October 15, 2018, 01:33:09 PM »
Does anyone know that the voltage should be on the DC convertor pins 2, 3 and 5, 6, 7 when it's working correctly?
Also, should the case of the DC convertor be set in a pin as well? I haven't seen those pins installed in any of the built module pics...


Thanks,
Dave

Re: EQN build thread
« Reply #618 on: April 28, 2019, 11:51:38 AM »
Hello,

I'm sorry for resurrecting an old build thread but I've just finished building a pair of EQNs and am having the same problem with both. I'm able to properly bias them with my scope but at the point of equal clipping, I'm getting low frequency oscillating and motorboating that changes with the location of RV5. By turning it CCW or CW the pitch of the oscillation changes. I'm able to get rid of this oscillation and noise if I turn RV5 CCW, but when I do so, the bias is all wrong and I get unequal clipping of a sine wave thru the unit. I'm in a Radial 500 series rackmount and when I unplug all other units, I still get the same problem.

All the controls of the EQ work great besides this unwanted noise and oscillation. I've double checked my transformer wiring and the resistor values around the output stage on the main boards and all seems well.

I would greatly appreciate any direction, thank you!

Potato Cakes

Re: EQN build thread
« Reply #619 on: May 05, 2019, 08:47:33 PM »
Hello,

I'm sorry for resurrecting an old build thread but I've just finished building a pair of EQNs and am having the same problem with both. I'm able to properly bias them with my scope but at the point of equal clipping, I'm getting low frequency oscillating and motorboating that changes with the location of RV5. By turning it CCW or CW the pitch of the oscillation changes. I'm able to get rid of this oscillation and noise if I turn RV5 CCW, but when I do so, the bias is all wrong and I get unequal clipping of a sine wave thru the unit. I'm in a Radial 500 series rackmount and when I unplug all other units, I still get the same problem.

All the controls of the EQ work great besides this unwanted noise and oscillation. I've double checked my transformer wiring and the resistor values around the output stage on the main boards and all seems well.

I would greatly appreciate any direction, thank you!

If the wiper for RV5 is too far to one side (CW?) you will get oscillation. Put RV5 in the middle of it's range and do the same for RV4. Read some of the posts on this thread about how the input trim affects the bias and then proceed accordingly.

Thanks!

Paul


 

Related Topics

  Subject / Started by Replies Last post
76 Replies
25260 Views
Last post November 03, 2010, 01:51:16 PM
by pH
64 Replies
9655 Views
Last post May 04, 2011, 12:44:32 PM
by peter purpose
11 Replies
4313 Views
Last post January 23, 2012, 08:48:55 AM
by peter purpose
9 Replies
3578 Views
Last post October 24, 2012, 01:26:04 AM
by haima