Chop Shop Q2 not biasing

[MrSage]

I've been struggling with getting my Chop Shop to work right.

I biased the J201s to about 6v using 20k trimmers, but it still didn't quite sound like everyone described it.

So I removed the old through-hold J201s I was using and swapped in some of the newer SMD ones.

Now Q1 is still biasing, but Q2 is hanging out right around 9V, with the slightest variation when I adjust the trimpot.

I checked a few of the adjacent components and swapped in a new C5 capacitor just to be safe, but nothing happened.

Any suggestions what to check next? Bad JFET? Would that have an impact?

 

[fig]

trimpot checks okay?

 

[MrSage]

trimpot checks okay?

Good question. I thought tested them before I put them in there, but now that I think about it, I can't remember if I tested the second one.

Definitely a good obvious place to start. Thanks!

 

[benny_profane]

How're you using the trimpots? Are you using one of the utility trimmit boards? The wiper has to be tied to one of the other legs.

 

[MrSage]

How're you using the trimpots? Are you using one of the utility trimmit boards? The wiper has to be tied to one of the other legs.

No trimmit board; just tied the wiper to one leg and soldered in directly.

 

[MrSage]