Help with AION Aurora Compressor Build

[nedonnelly]

Hello masters of the DIY Stompbox world. I seem to be having some trouble getting my DIY aurora build up and running. This is only my third build so there is likely an easy answer. As of yet it hasn't presented itself to me, but it might present itself to the infinite intelligence of the internet 

Here is a picture of my work


Here is the checklist:
1. What does it do, not do, and sound like?
Effect (circuit) not working : Audio does work when effect is not engaged/bypassed

2. Name of the circuit => Aion Electronics Aurora 125b Dyna/Ross Compressor

3. Source of the circuit (URL of schematic or project) =
https://www.dropbox.com/s/2hd9ujnxndb9fe5/aurora_documentation.pdf?dl=1

4. Any modifications to the circuit? No

5. Any parts substitutions?
Electrolytic Capacitors (C3, C4, C7, C9, C14, C19) are tantalum capacitors
Film Capacitors (C1, C10, C11, C12) are polystyrene capacitors
RPD = 2.2M Yageo

6. Positive ground to negative ground conversion? No

7. What is the out of circuit battery voltage? => 9.43 v
Voltage at the circuit board end of the red battery lead => 9.36 v
Voltage at the circuit board end of the black battery lead => 0v

Q1
C = 7.12
B = 2.43
E=2.013

Q2
C= 6.87
B= 2.775
E= 2.25

Q3
C = 8.92
B = 0.221
E= 0.0

Q4
C= 8.90
B= 0.0
E= 0.0

Q5
C = 9.1
B = 8.92
E = 8.6

Q6
C = 6.88
B = 2.788
E = 2.254


IC1 (or U1)
P1 = 1.172
P2 = 0.053 (Begins to fall as the leads contact)
P3 = 4.725
P4 = 4.726
P5 = 2.792
P6 = 0.000
P7 = 0.005
P8 = 1.10 (Starts out here, but begins falling quickly as the lead contacts) Stops falling at 0.86
P9 = 6.12
P10 = 0.015
P11 = 9.06
P12 = 0.002
P13 = 0.000
P14 = 0.000
P15 = 0.000

D1
A = 9.33
K = 9.13

D2
A = 0.0
K = 0.0

D3
A = 0.0
K = 0.257

Thanks in advance for the help!

[nedonnelly]

Not sure if this will help illuminate any troubleshooting suggestions. I did happen to accidentally reverse the leads of battery when attempting to connect it. This happened to pop on the LED, which led me to triple check the wiring to the instructions. Everything as far as I can tell is wired as it should be. I then connected the effect to an amplifier and still no sound when the effect is engaged even when the LED is illuminated. Again thanks for the future help

[nedonnelly]

Might be talking to myself on this thread, but such is the world of troubleshooting. (Maybe this inner dialogue will be helpful to another person in the future)

Talked to the electronics guru I know and he quickly spotted the trouble with my LED. I reversed the polarity. Just resoldered that and now I must go searching for the error in the effect.

But at least now I know when the effect is on. Yay!

Onward and upward!

[DIY Bass]

It may not be a bad idea to audio probe the signal path and see where the signal is disappearing

[duck_arse]

and welcome to the forum.

of slight interest, both Q3 and Q4 base should read 0V00, or as close as. that means that both D2 and D3 Kathodes would read 0V00 as well. only, your Q3 base shows some milliVolts, while the diode connected to it, D2, shows 0V. and the D4 K shows volts, but the base it is connected to shows 0V. confusion in readings?