My diy overdrive pedal
A year or so ago I got a LM386 power amp chip from my dad and was wondering what to do with it so I started googling and found this guitar pedal schematic. It’s a clone of the Fuzzrocious “Ram the Manparts”, which is pretty much just a LM386 with a switch to max out it’s gain, causing it to clip the signal and a potentiometer that lets you limit the current going into it to make some cool glitchy sounds. I built it on stripboard without a stomp switch or DC jack just to try it out using a battery. I also didn’t have any logarithmic potentiometers so I subbed in a 5K linear for the starve and 100K linear for the volume. I put the circuit in a cardboard box with holes on the side for jacks and potentiometers and left it that way for a long time as I didn’t have a proper enclosure to put it in… until now that is.
There are still a few things missing though.
- There is no LED to show the effect is engaged and there are 2 empty holes on the front. I’ll need to find something that I can use to panel mount an LED to one or both of the holes.
- There is no battery. I probably won’t be adding one at all because I’m happy with just using a wallwart for power.
- Normally stereo jacks are used in the input to connect/disconnect power to the pedal so you don’t kill the battery while not using the pedal. I didn’t have any stereo jacks when building this so I used a mono one and instead connected the power through the third switch in the 3PDT stomp switch. Since I’ve decided not to add a battery at all I should just connect the power jack straight to the board without the switch instead.
- I also need something to cover the bottom so I don’t accidentally short out the pedal. I’ll probably cut a piece off a plastic laptop lid as I have a few of those laying around.
I’ll edit this page whenever I finish all of the above but for now I’m really happy with how this one turned out as it is my first proper guitar pedal build.