MXR Dynacomp debug (Help, please)

Started by divanorosso, March 04, 2019, 03:10:04 PM

Previous topic - Next topic

divanorosso

Hello,
I kindly ask for your help.

1.What does it do, not do, and sound like?  Good output when effect is in bypass. Extremely low output when effect is on.

2.Name of the circuit = MXR Dynacomp

3.Source of the circuit (URL of schematic or project) = https://effectslayouts.blogspot.com/2015/04/mxr-dynacomp.html

4.Any modifications to the circuit? No

5.Any parts substitutions?
a) 26k resistors instead of 27k
b) All diodes are 1n4148 (instead of two 1n4148 and one 5817)

6.Positive ground to negative ground conversion? Center negative

IC  3080 bought on Banzai
1 = 0
2 = 4.15
3 = 4.15
4 = 0
5 = 0.65
6 = 2.45
7 = 8.5
8 = 0

Transistors are 2n3904

Q1  E=1.36      B=1.87      C=8.48

Q2  E=1.82      B=2.40      C=6.62

Q3  E=0          B=0.04       C= Sometimes fixed at 8.16. Sometimes grows gradually at 5v and then returns gradually to 7.45v

Q4  E=0          B=0.01      C=8.15

Q5  E=7.65     B=8.18      C=8.47

D1=0.03 
D2=0.03
D3 (5817 on schematic, 1n4148 my sub) IN at 9.09. OUT at 8.47

The 3pdt is "two-led" type

Excluding the connections of the potentiometers, the rest has been wired as in the picture

Please, help me before my wife divorces because I have been talking with Dynacomp for two days and not with her.

Thank you