Stompbox FatBoost - ITS KILLING ME...

[Dr_J]

Hi everybody,

i thought that would be a quick build for a friend of mine, 11 components.
BUT... it's killing me :-[
I build it 2 times, same result - it's not really boosting. If i crank up Gain&Volume is give the same as in bypass...

I found out that when i put a link in as shown (red), it seems to work fine... tone, gain, volume...
What the heck do i miss here!?!?
I guess i don't see the wood for the trees....

A hint would be soooo great!!


Thanks & ROCK-ON!

 

[PRR]

> A hint would be soooo great!!

Transistor pin-outs (they are not all the same).

Transistor pin voltages (electricity is invisible so you are guessing in the dark).

 

[Dr_J]

Hi PRR,

thanks for the hint.

I checked it again.

I use 2N5457 TO92, pin-out is D/S/G. I checked this although. (I although tested different components of course)
To be sure i added the pin-out in schematic (first post).

... still fighting...

ROCK-ON!

 

[JohnRoberts]

check that the 3.3uF cap is connected where it is supposed to be. If not in place, the source of the top JFET will be a low impedance and kill the signal.

JR 

 

[Dr_J]

Thanks John for the hint.

I'll check that again.
I'm sure i did before, but you never know...
I have the 0.22uF under suspect... has far as with the FETs everything is right.

ROCK-ON!