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Timer circuit diagrams
August 8, 2010
This timer was designed mainly to switch off a portable radio after some time: in this way, one can fall asleep on the sand or on a hammock, resting assured that the receiver will switch... [more]
June 22, 2010
By using the same circuit of the "Digital Stopwatch 0-99sec", we can add an AND gate, and transform the 0 – 99sec stopwatch to a 0 – 60sec stopwatch. [more]
June 22, 2010
A switched timer for intervals of 5 to 30 minutes incremented in 5 minute steps. [more]
June 22, 2010
This is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. [more]
June 22, 2010
This is a circuit intended to be used in basketball shot clock. [more]
June 22, 2010
These two circuits are multi-range timers offering periods of up to 24 hours and beyond. Both are essentially the same. The main difference is that when the time runs out, Version 1 energizes the relay... [more]
April 29, 2010
The clock circuit above uses seven ICs and 19 LEDs to indicate binary coded decimal time. The LEDs can be arranged (as shown in example above) so that each horizontal group of 3 or 4... [more]
April 29, 2010
This circuit uses the PIC16F628 microcontroller to provide 4 timed outputs that can be programmed from 1 minute to 1 week. An extra 8 bit shift register (74HC164) is used for the 4 timer outputs... [more]
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