The Korg Monotron was deceptively simple. It was essentially a single-oscillator analog synthesizer stripped down to its barest components. It featured a sawtooth oscillator, an LFO (Low Frequency Oscillator), and—most importantly—the legendary MS-20 filter.
Note: This paper describes a design concept. All circuits should be prototyped on breadboard before PCB layout. Flash sample rate and resolution are minimal – higher fidelity is possible with external audio codec (e.g., WM8731) at higher cost. flash monotron