Acetylene 2nd Try

[ALK2MT]

Hi there. This is my 2nd attempt at this build and I feel like it generally went better until final checks. I pre checked and tested all components to spec before installing.

The pedal only lights up the boost side, LED is bright, clicks off and on. No sound on bypass and no LED on and off from main foot switch.

I’m starting with jacks, then moving to foot switch as potential issue to see if I can at least get bypass signal. I’ve also tested all grounds and they appear to be functioning.

What is the best way to retest a component after it’s soldered on?

Would love some other ideas on troubleshooting this.

Thank you.

 

[temol]

Spots marked in yellow - measure voltages.
Spots marked in red - check for the signal with audio probe.

 

[ALK2MT]

here are the voltages I measured for yellow dots. Seems like a drop happens at Q1 also across the IC1. I need to build an audio probe to measure signal at red dots.

For Q1 that should be at 4.7 V on the collector correct?

 

[Brett]

No sound on bypass

How certain are you that your jacks are connected to the correct lugs?

Your input jack appears to be stereo, if that's the case, you have your tip (+) connection going to the incorrect (switched) lug. That's one part of the problem.

 

[Brett]

For clarity, you have your input connected to lug #2 when it should be connected to lug #3:


As it's currently wired, you're disconnecting the input as soon as you insert your cable.

 

[ALK2MT]

How certain are you that your jacks are connected to the correct lugs?

Your input jack appears to be stereo, if that's the case, you have your tip (+) connection going to the incorrect (switched) lug. That's one part of the problem.

I will rewire with a mono jack.

 

[Brett]

I will rewire with a mono jack.

No harm in just moving the wire. Alternatively, you could just solder a jumper wire between pins 2 and 3 of the input jack that's currently installed.

 

[ALK2MT]

Added a jumper wire, no changes to Voltages or sound.

 

[Brett]

Added a jumper wire, no changes to Voltages or sound.

Can you take an updated pic for us?

 

[ALK2MT]

Can you take an updated pic for us?

 

[ALK2MT]

Ok I ran the audio probe.
1 = Silent
2 = Silent
3 = faint but signal distorted
4 = loud, buzzy, strong signal
5 = not as loud but signal there
6 = not as loud but signal there
7 = not as loud but signal there
8 = not as loud but signal there
9 = not as loud but signal there
10= not as loud but signal there
11 = sporadic signal, LED went off and on.

I clicked foot switch on and off but LED stayed off. I could not get it to turn back on.

Boost LED still works.