Circuit - 24V DC Powered Beeper with 4 Separate Inputs

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Last Updated on: 06/19/2009 03:06:22 PM

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

May 17, 2007

24v DC is a very popular voltage used in industrial settings. The 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 the Drawing to view PDF