Siren disc - Seebeck
A disc is made with several concentric circles of uniformly spaced holes and is mounted on the axis of a shaft driven by a motor. Pressurized air is directed into the holes. Different musical notes are realized on different circles. The motor speed may also be varied to change the frequency.
|Siren disc mounted on a DC motor||021-17C|
|DC power supply||021-16B|
|flexible plastic tube with a metal nozzle.||021-7C|