# CM108

AI-generated

A family of cheap USB audio chips
(CM108, CM119 and compatibles)
whose spare GPIO pins can key a transmitter.
Many radio interfaces are built around one,
so a single USB connection gives both audio and [PTT](../ptt/index.html.md).

## References

* [CM108 compatible chips with GPIO](https://irongarment.wordpress.com/2011/03/29/cm108-compatible-chips-with-gpio/)