[2627] Increase Fuzz Face Output

Date: October 16th, 2019 | Comments : [1] | Categories: DIY.

This is the basic schematic of a PNP germanium fuzz face. Some players find that the output volume is too low, but there is a simple mod to fix it.

The R3 and R4 resistors are a voltage divider that is reducing the signal level going to the output. The sum of their values is also contributing to the operating bias for Q2, which can be measured as the voltage on the collector of the transistor. A simple way to increase the output volume is to exchange the values of R3 and R4 as shown in the schematic below. The bias on Q2 stays the same since the same two resistors are being used and there will be little or no change in the tone produced by the fuzz – it is just louder!

The same trick works for silicon fuzz face pedals as well, and NPN or PNP versions, though the values of the two collector resistors of Q2 may be different.


One Response to “Increase Fuzz Face Output”

[786994] Constantin Says: 6:46 am, November 7th, 2019

Brilliant. Like everything else you’ve taught us, Jack.

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