Uproar... Noise on high freq

[gtangas]

Hi guys

I was playing yesterday with my uproar and something strange happen

With the mid boost engage it starts, sometimes, to break,noise, the distortion...

I used the values suggest by Brian.

It only happens with the switch on and on full gain

Any tips?

[gtangas]

Any one?

[gtangas]

...

[gtangas]

Come on guys....

[stecykmi]

is it the presence mod or the super-duper mid range booster mod?

[gtangas]

Is the super-duper mid range booster mod

I made the presence mod but didn't make much difference...

When I flip the switch position I hear a squil noise and with the mod on I hear sometimes the same noise...

Cap values?

[madbean]

Could be just too much gain causing some oscillation. It might get more prominent with the mid range boost on. Try cutting R5 down to 470k - 680k and see if that stops it.

[stecykmi]

dunno man, it could be lots of things. use an audio probe and try to find what gain stage the squealing starts.  being a high gain circuit, you need use either a battery or a high-quality power supply as it will be very prone to noise with an unreliable power supply.

[gtangas]

Ok I will try swap r5 and see what happens

Thx guys

[gtangas]

Changed the R5 to 470k and played for bit and can't hear the oscillation...


Hope it is solved

Love this animal