M402 Photo Mod Clock

Summary

The M402 is an RC-coupled multivibrator module designed to generate standard 100-ns timing pulses for digital systems. It features an adjustable repetition rate ranging from 1 Hz to 500 kHz, split into two selectable frequency bands using internal capacitance jumpers (0.01 µF or 2.00 µF). Fine frequency tuning is achieved via an internal light-controlled mechanism triggered by a 0V to 5V input across pins L and M. The module includes a 2-input OR gate for start-stop pulse control, provides both positive and negative pulse outputs, and operates with a power requirement of 5V at 100 mA.