A-440 Kit
A-440 Kit

Tune a piano, not a fish

The A440 Kit produces a reference sine wave at 440 Hz, or middle A.
The frequency is crystal controlled and the sine wave is very clean.
This stand-alone board can be mounted anywhere and be wired to
any kind of jack or other circuit.

The kit uses a standard 10 pin Eurorack power connector, or power
can be wired directly to the board.