9V Air Raid Alarm Siren Kit

This product is obsolete/discontinued and no further stocks are available. Please see alternatives in the category links above.

Product Formats Available: Pre-Assembled Module (AS) or
Self-Assembly Electronic Kit ( Soldering Required)

A surprising loud siren for such a simple circuit. It uses a voltage controlled oscillator to drive the 1W loudspeaker provided. Makes an ideal internal siren for use in fire alarm, burglar alarm and other warning systems.

The alarm output builds in frequency and amplitude to a loud and effective alarm for such a simple circuit. If the On button is repeatedly held and released it sounds somewhat like a high pitch wartime air raid siren or 70's American patrol car. You could experiment with different component values to change the output.