Auto-Bias Fuzz Face
The Fuzz Face boards are finished and on their way!
A few things to note about the design. First off, the transistor pads are spaced so I can solder in the nice Mill Max transistor sockets, so anyone who wants to experiment with transistors can do it easily.
Second, if you'll notice, C1 and C5 are set up for big axial capacitors. I have a pretty big stash of old-school axial caps for the turret builds and I thought the mojo would be nice for these.
C2 and C3 are for trimmer capacitors (25-120 pF), so the high end response of each transistor can be tailored to suit the player's tastes.
R5 is the Vactrol controlling the auto-bias circuit. I have high hopes for this. This pedal should never drift out of bias due to room temperature, which has always been a problem with germanium circuits. You set that, "Bias" potentiometer and it's going to keep the transistors at that level of current consumption no matter how they drift operationally.
If you'll notice, there are jumpers in the bottom right area to switch from PNP to NPN and there's a socket for a voltage inverter, so this can be built for either polarity of transistors.
I'd like to imagine that this is the Fuzz Face that solves all the issues people have ever had with Fuzz Face pedals. Time will tell.
Auto-Bias Fuzz Face
The Fuzz Face boards are finished and on their way!
A few things to note about the design. First off, the transistor pads are spaced so I can solder in the nice Mill Max transistor sockets, so anyone who wants to experiment with transistors can do it easily.
Second, if you'll notice, C1 and C5 are set up for big axial capacitors. I have a pretty big stash of old-school axial caps for the turret builds and I thought the mojo would be nice for these.
C2 and C3 are for trimmer capacitors (25-120 pF), so the high end response of each transistor can be tailored to suit the player's tastes.
R5 is the Vactrol controlling the auto-bias circuit. I have high hopes for this. This pedal should never drift out of bias due to room temperature, which has always been a problem with germanium circuits. You set that, "Bias" potentiometer and it's going to keep the transistors at that level of current consumption no matter how they drift operationally.
If you'll notice, there are jumpers in the bottom right area to switch from PNP to NPN and there's a socket for a voltage inverter, so this can be built for either polarity of transistors.
I'd like to imagine that this is the Fuzz Face that solves all the issues people have ever had with Fuzz Face pedals. Time will tell.