proco rat vero clone noise issues with gain past 12 o clock

[GGBB]

Yes - that's right.

[snow123]

Um - no. I think you've just grounded the signal. You want the centre conductor connected normally between jack tip and switch input lug, and the shield connected at one end only the jack ground (or the ground lug on the switch). You should also use shielded wire from the switch to the board input connected the same way.

And this is how the wire should be?

[GGBB]

Bingo.

[snow123]

heres the wiring now

[snow123]

aannnd it still squeals

[r080]

Did it squeal before you put it in the enclosure?

[snow123]

Did it squeal before you put it in the enclosure?

i never tested it outside of the enclousure.

[r080]

Now might be a good time.

Especially with vero, the general rule is rock it before you box it.

[snow123]

Now might be a good time.

Especially with vero, the general rule is rock it before you box it.

can i just test it with everything except the pots outside of the enclousure?

[mdcmdcmdc]

Now might be a good time.

Especially with vero, the general rule is rock it before you box it.

can i just test it with everything except the pots outside of the enclousure?

If it's oscillating inside the enclosure, it's going to oscillate outside of the enclosure for sure.

This is a really common issue with rats. There isn't an easy fix as far as I know, as it happens on ProCo's PCBs as well as on vero builds.

If you've tried increasing the value of the 30pF compensation capacitor to 100pF or greater and are still getting oscillation, and swapping in a different opamp hasn't solved it, then it's probably just an unfortunate accumulation of parts tolerance and whatever stray capacitance is happening as a result of the crisscrossing that happens on a vero layout. A buffer at the input solves the problem in almost every instance.

[snow123]

and can i remove the shielded wire and replace it with stranded wire? its kinda annoying to work with lol.

[snow123]

increasing the compensation cap didnt help

[snow123]

and I accidentally put in a 330pf cap 'cause I didnt see the "1" and thought it was a 33pf...

[Phend]

and I accidentally put in a 330pf cap 'cause I didnt see the "1" and thought it was a 33pf

Oh Rats

[snow123]

i just put it some sockets to test different compensation caps.

[snow123]

and apparently the socket fixed the squealing.

[snow123]

it works now i think

[snow123]

i thought i could replace the shielded wire on the input jack and its squealing again lol

[snow123]

its working amazingly now! thanks guys!

[duck_arse]

and I accidentally put in a 330pf cap 'cause I didnt see the "1" and thought it was a 33pf...

we can't do the seeing for you. and we still want to see photos of completed AND WORKING builds.