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CP5176 FET compressor / CP 5176 no output

« on: December 02, 2023, 02:48:09 AM »

I was done with assembling the cp5176 I had a good feeling about it, but unfortunately it didn't work as excpected.

I followed the setup guide

0V with V+ was 15.61
0V with V- was -15.61

0V with TP 7 was -5.41

i got no output when measured the 1khz sine through the XLR output, i thought i was doing something wrong.
Eventually i plugged in my MP573 and set all the MP573 settings low. On the XLR ouput i saw that the voltage in MVAC  was coming through like it supposed to be... When turning down DAW-output level the AC voltage turned down aswell.

I checked  Topic: In case your CP5176 doesn't work as expected

I've got no forgotten solder, i reflowed every joint, no reversed components or flipped ic's and everything is trimmed enough so i doesn't touch the board or ground.

I did measurement DC voltage A till G:
A=   0.0
B= -0.39
C=  0.0
D=  0.0
E=  0.0
F= -0.39
G=  0.0

ofcourse this is not how it should be.

Maybe a defective component?
Is there a short early in the circuit?
What to test?

PS. the DIY package was incomplete..  i miss one of the control knobs (on the outside of the module for:  attack, relase, ratio, input, output) i received 4 from the 5.

2

MP573 Microphone preamplifier / MP573 No input after assembling

« on: October 09, 2023, 05:00:24 PM »

I recently finished my MP573 unfortunately without succes.

After testing (TP2 with V+) I measured 23.9V (on 200V scale)

The same 23.9V was also measured with output transformer connected.

I thought it would be close enough to test the module, unfortunately no input signal.

When I went through the troubleshoot checklist i measured the points
A till L

The points were all good except the following points:
D= 12.83V (within 10% range but still)
H=1.71V
I= couldn't measure within power supply
J =couldn't measure within power supply
K= don't know how to measure
L=0.0

What can i do to fix it?
Does this mean i have some weak or missed solders?
Does this mean some components are not placed correctly?

I hope you can help me out!