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Mach 1...No Sonic Boom

MightySmallElectrons

Active member
A2179A4A-C15A-4096-81D5-01F585D3DE4D.jpeg
Was feeling super confident with this one..alas no sound.
After I saw that I had forgotten to install the OpAmp I figured I had it solved.
Not so...no sound.
I accidentally substituted an A100k for the A500k because I soldered before I realized it was on the wrong side. I know that’s not ideal but I don’t think it’s my problem. I’ve got lights and pass through but no effect.
If you see anything obvious please let me know. May have some time tomorrow to troubleshoot.
 

Bobbyd67

Active member
Having said that your build is very clean and the jack thing is pretty hard to mess up on a pedalpcb board. Maybe try another opamp too that could help.
 
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MightySmallElectrons

Active member
One thing I noticed when I was checking continuity last night;
When I completed the circuit with my thumbs on the jacks...uh...I could hear faint signal and the pots were affecting the level of signal.
I’m guessing I have a bad solder joint somewhere. Maybe R5 where I had to remove some solder from accidentally filling that hole?
 

Bobbyd67

Active member
Might be :/ my personal troubleshooting checklist is check
- check wiring
-change ics
- reflow pots from the components side
- reflow resistors and diodes from components side
-swear a hole bunch
- take the hole thing out the enclosure and reflow everything from the bottom
- check components value... This is the part I hate the most but your build is pretty small so it shouldn't take to long
- after that I am usually stuck xD i know some people use a probe to check exactly were the signal loss is from but I ain't that good at pedal building yet !!
 

MightySmallElectrons

Active member
Are those Tayda jacks? I’ve had a few bad ones over the years. Build a test box! :)
Really? I’ve got continuity between the box and jacks. It seems an almost foolproof design...what do you think the problem was?
I’ve got some Lumberg jacks due in later this week. If I can’t sort it before then I’ll try those.
 

MightySmallElectrons

Active member
Did you sort this. Are R5 & R11 -3K3
Output Jack tip looks awful close to Enclosure Rib.
Did you try a 4558, TL072
Thanks music6000...I built another last night and it works great. I’m really liking this pedal as a light overdrive.
I was curious to compare to to my Barber Gain Changer which I love. It is definitely going to be useful.
 
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