RunOffGroove Fetzer Valve Revisited. This circuit aims to emulate 12AX7 triode stage in Fender amps. It uses a J201 N channel J-FET. Carefully biased, it works pretty well, you get a neat, loud and full of harmonics sound, with a lot of gain (depends on the J201, it's better to sort and measure them with...
This schematic has a few functions to this circuit. This circuit takes voltages starting from 4V to a max. of 13V. It was an open source project I found online. I've redone this board's schematic. But when it came to de PCB design I kinda lost it. I got as close to sorting the components on the board, but I didn't know where to start connecting wires or how. I'm taking a little break, but if anyon...
WARNING Overvoltage-Reverse voltage protection with PTC and diode, Overcurrent Protection with PTC U2-U3.
Overdischarge protection with microcontoller.
Wrong setting may cause Injury or Overheating.
Overheating + Battery = Acidic gas + Fire + Expolosion. Only for indoor and well ventilated areas.
Produce at your Own Risk
12 to 15 volt step up converter,12V lead acid battery charger, output voltag...