jubal81
Well-known member
I liked my design from Chuck's contest so much I got a PPCB Muffin board and got it all boxed up.
The schematic is in the link, but the general idea is it's pretty much a Big Muff made over with all JFET transistors - including using them for the clipping diodes. The tone control is modified to a simple treble cut instead of the typical scooped Muff sound, so it really cuts through.
I also added a switch to take the source bypass cap on the first stage out of the circuit to make a 'high gain/low gain' toggle.
Ended up using BF862 JFETs since I have a pretty good stash. The minimum IDSS on these is 10mA, so I dropped to a 2.7K resistor on the drain since I've got a lot of resistor values in stock below 1K. The source resistors ended up between 330R and 470R and the drain voltages around 5.5V.
The schematic is in the link, but the general idea is it's pretty much a Big Muff made over with all JFET transistors - including using them for the clipping diodes. The tone control is modified to a simple treble cut instead of the typical scooped Muff sound, so it really cuts through.
I also added a switch to take the source bypass cap on the first stage out of the circuit to make a 'high gain/low gain' toggle.
Ended up using BF862 JFETs since I have a pretty good stash. The minimum IDSS on these is 10mA, so I dropped to a 2.7K resistor on the drain since I've got a lot of resistor values in stock below 1K. The source resistors ended up between 330R and 470R and the drain voltages around 5.5V.