Fuzzy Joe v1.1
Manufacturers and product names are mentioned solely for circuit identification, and where applicable their trademarks are the
property of their respective owners who are in no way associated or affiliated with the author. No cooperation or endorsement
is implied.
9
Biasing
The transistors need to be biased. The best way to do this is by using the bias pots
VR2
and
VR3
.
Start by using the following settings:
VR1
: all the way to the left (or switch
SW1
to -9V = connect left and middle pad)
VR2
: all the way to the right
VR3
: all the way to the left
Fuzz
: max
Volume
: max
Now move
VR2
and
VR3
more to 12 o’clock and test it with different fuzz levels by turning the fuzz
pot. Stop when you found your sweet spot. Remember that germanium transistors are very sensitive
to temperature changes and will need to be re-biased every now and again.
Fixed resistors
If you have trouble biasing or just do not want it, you can replace
R3
with a 33k resistor and
R5
with a
8k2 resistor and leave out
VR2
and
VR3
. You will then also need to short pad 1 and 2 on
VR2
and pad
2 and 3 on
VR3
.
Transistors and resistors
As you might have concluded from the schematic, the effect is a basic positive ground Fuzz Face with
some small changes. You can adjust any value resistor you want to make it sound any way you like.
You can also use any type of PNP transistors instead of the ones mentioned in the components list.
