How to add momentary feedback switch on a fuzz pedal?

[Se7en_Costanza]

I've recently made a fuzz, which is essecially just a more beefy bass fuzz circuit with some mods, and want to add a momentary switch that can trigger sudden bursts of insane feedbacking fuzz, like on those fuzzrocious pedals. Could anyone help with like a schematic or explaination on how to do that? Thanks.

[stonerbox]

Just add connections to the input capacitor + side and the outputs capacitor + side (or Q1's emitter) with a momentary switch in the middle. However, I would highly recommend you to experiment with filtering (low passing) the feedback signal for a more pleasant sound. Good luck!

[Se7en_Costanza]

Cheers ill give that a go today, how would i low passing it btw? I'm still a bit of a newbie with pedal building.

[stonerbox]

how would i low passing it btw?

Add a resistor (the signal is supposed to pass through it back to the start of the pedal for i.g. the input capacitor) before of after the momentary switch, it does not matter. Then add a capacitor (not electrolytic) and connect it to ground and you're done!
1k + 0.1uF will result in a cutoff at around 1.5 Khz, which could be a good start but experiment! If you want to take things one step future replace the resistor for a potentiometer and you'll be able to control the cut off frequency.



Here is a very easy and good calculator to help you choose component values.
http://www.muzique.com/schem/filter.htm

[antonis]

Maybe we need a drawing of your feedback circuit..

Probably you refer on a fuzz with at least two transistors, so you have to identify what kind of feddback you use (i.e. series-shunt or shunt -shunt) because adding feedback is remarkably altering first transistor's bias.