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More  Beeper Circuits

24V DC Powered Beeper with 4 Separate Inputs
May 17, 2007
designed by David A. Johnson, P.E.

24v DC is a very popular voltage used in industrial settings.  This hobby circuit below was designed to accept four different 24v DC alarm input signals, which are then used to drive a single low power beeper. 
The beeper is a magnetic type with its own oscillator/driver.  The four diodes form an “OR” gate so any one of the four inputs will cause the beeper to make noise.  A CMOS version of the popular 555 timer is used to strobe the beeper on and off at about 1Hz.

Click on Drawing Below to view PDF version of Schematic

Circuit 24V DC Powered Beeper with 4 Separate Inputs, designed by David Johnson

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