Carl Martin Crush Zone

Here is a simple distortion pedal by Carl Martin.
Original FSB thread and schematic available here.

THAT Jam Compressor

Here is a DIY project similar to the Carl Martin Compressor Limiter.
There are 2 layouts: a large one that works at 9V and a smaller one where you need to decide a way to feed +/- 12V to the circuit (just a charge pump with regulators wouldn't work with this circuit).
You should read the original threads from FSB here and here before building this effect.
Good luck!

Carl Martin Rock Drive

The mellower little brother of CM Heavy Drive. Original units share the PCB with each other, but there are number of differences on the circuits.

Carl Martin Heavy Drive

Just noticed we didn't have any CM designs on the library yet. Demo vid i found isn't the greatest quality, but it has a Dinosaur Jr. riff, followed by some White Stripes, so i just had to post it. Made me feel like 25 all over again. Pedal seems like a nice distortion unit too. The low noise MC33097 quad opamp may be required for best results, but i see no reason why TL074 or LM324 wouldn't work here too.