Korg has published a reference schematic for their excellent Monotron analog synth. Folks in the circuit bending community have been hacking this thing since it came out, but now we have a schemo to follow. Yet another tool in the quest for a fat, tasty bassline!
I can’t find this schematic on the North American site, but it is available on the Japanese site (scroll down to the bottom) or click here to get the PDF (monotron_sch).
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.
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Well I’ll tell you one thing, the filter isn’t even remotely an MS-20 clone. It’s very very similar to the Gakken SX150 though. The main difference is the FET F3, which is necessary because the LM324 opamp has a relatively low input impedance. Strangely enough, the SX-150 doesn’t have this even though the NJM2902 is roughly equivalent to the LM324.