555 light turn-off reminder circuit

Published:2011/5/16 6:17:00 Author:Christina | Keyword: light, turn-off, reminder | From:SeekIC

The 555 light turn-off reminder circuit is as shown. This circuit is composed of the monostable delay circuit, driver circuit, buzzer, LED.etc. And the monostable delay circuit's (composed of the 555 and R1, C3) output signal controls the rear circuit. Power supply of the direction light relay gets through the diode and adds to the pin-8 of 555, this makes the capacitor C3 to be charged through R1. Pin-6's voltage level increases by charging, when pin-6's voltage level gets to 2/3VDD (about 1-minute delay), 555 overturns, the low level voltage of pin-3 makes the BG to conduct. The corresponding LED turns on, and the buzzer starts working, the sound and light signals remind the driver to turn off the light.



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