Fuzz hisses and squeals when connected to a DPDT or 3PDT switch

[estch71]

I built the Amtron Fuzz using a schematic from tagboard effects:

http://tagboardeffects.blogspot.com/2013/01/amtron-uk854-fuzz-box.html

The problem I'm having is that when I connect the input and outputs straight to 1/4 inch jacks, the pedal sounds great.  When connected using any type of bypass switch, it squeals and hisses like crazy.  I'm wondering if there's something I'm missing.  I did omit the 470R pot in favor of a 470R resistor while also using a 10k trimmer instead of a 25K.  Could this be the issue or, as I'm also thinking, is it a grounding problem.  The ground on the layout goes (in my build) to the output jack's ring where the ground from the power is as well.  I'm also connecting the output ring to the input ring as a ground as well. 

[mistahead]

Did you connect the GND on the switch?

Actually lets jump ahead - what switching layout are you using (link pic)?

[estch71]

The difference with mine is that lug 4 is connected to the LED negative leg and 5 goes to ground.  Everything else is the same.

[estch71]

Even without connecting the LED, it still squeals.  It's a great sounding fuzz; gritty and growling at times.  Sounds amazing with a boost before it.

[mistahead]

Try using the layout with the diagonal - the effects GND one.

GGG layouts page has it (sorry at work and about to go on a call)

[mistahead]

Hang on - is it a Neg GND circuit?

[estch71]

Yes. It's able to be daisy chained with other negative ground pedals.

[mistahead]

Yeah then I'd recommend the GGG gnd in bypass neg gnd layout, see how it goes... its only around one wire difference (and the "best" layout in some of the guru eyes).