Closed Circuit Booster - No Sound when Activated

[Third Age Amps]

Hello All,

I recently finished the CC Booster and am curious if the type of Opto matters? I used a VTL5C1 rather than the NSL-32. Regardless, bypass works, but very low to no sound when activated.

Thanks all!

 

[Nostradoomus]

Is that a 100N or 100pf cap at C101?

 

[Third Age Amps]

That is a 100n, I just opted to use an MLCC.

 

[Third Age Amps]

Bump! Any ideas, anyone?

 

[okstateblues]

Do you have an audio probe? If so you can follow the signal path of the audio based on the schematic to see the exact point where the signal significantly drops.

 

[Nostradoomus]

Yeah an audio probe is your best bet. Did your vactrol have any polarity markings on it?

 

[Third Age Amps]

I don’t have an audio probe, but I’ll look into them.

yes, the Opto was marked and I installed it + to “A” and - to “K”.

 

[okstateblues]

Just Google audio probe and it will come up with tons of options. They can be made with spare parts you probably already have or can get fairly easily along with a guitar cord you don't mind sacrificing. Its a pretty useful tool if you are going to continue building pedals.

 

[Third Age Amps]

Ok, found a cold solder joint in one of the chip sockets. All fixed and working.

does anyone know how the limiter control is supposed to change the sound? If anything, it’s subtle from what I’m hearing.