Flash Monotron Jun 2026

The Monotron range includes several specialized versions tailored for different installation needs:

A standard monotron drifts ~10 cents/°C. The Flash Monotron reduces this to <2 cents/°C using: flash monotron

The original monotron circuits are beloved for their raw, unstable analog character. However, pitch drift, limited envelope control, and lack of memory restrict their utility. The Flash Monotron addresses these issues by: The Flash Monotron addresses these issues by: Note:

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. Instead of a simple attack-release, we implement a

Instead of a simple attack-release, we implement a discrete ADSR using a dual OTA (LM13700 second section) and timing capacitors. Envelope times are controlled by: