Posted on Wednesday, May 4, 2011 • Category: Timer Circuits
Here is a 60 minute countdown timer that can be used as an exposure timer for UV light boxes, photography, egg timer, and many other projects where counting or delay is necessary. The heart of the countdown timer is PIC16F84A chip and 4 digit character LED display. The relay is energized after the count down timer goes down from specified minute and second until zero, and can both turn devices on or off. See the link for details and schematic. 1 min - 2 hours Timer with Buzzer and Optocoupler 60 Minute Countdown Timer
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