Novel Buzzer

Posted on Mar 8, 2013

This novel buzzer circuit uses a relay in series with a small audio transformer and speaker. When the switch is pressed, the relay will operate via the transformer primary and closed relay contact. As soon as the relay operates the normally closed contact will open, removing power from the relay, the contacts close and the sequence repeats, all very quickly...

Novel Buzzer
Click here to download the full size of the above Circuit. fast that the pulse of current causes fluctuations in the transformer primary, and hence secondary. The speakers tone is thus proportional to relay operating frequency. The capacitor C can be used to "tune" the note. The nominal value is 0.

Leave Comment

characters left:

New Circuits



Popular Circuits

Dimmer circuit
Simple Capacitive Touch Sensor
Analogue Inputs to MIDI Out
RC Audio Oscillator
Light that screen!
Digital circuit strain with MAX1494
Six a start and stop intermittent cycle control circuits
Electronic devices yell LM386 PT-8830