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Timer circuits. (Basic Circuitry).
- Article from:
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Poptronics
- Article date:
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June 1, 2002
- Author:
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Copyright informationCOPYRIGHT 2002 Poptronix, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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I've just started on a design project I that requires a number of timer circuits. These will entail a variety of semi-precision timers including on/off, delay-on, and delay-off circuits. Since this is a work in progress, I will share some of the circuit designs with you.
Time
The project requires a timer that repeats the on/off cycle as in an astable oscillator circuit; however, the on and off time period must be easily adjustable without one adjustment affecting the other. The timer must also maintain a good degree of accuracy.
The CMOS 4528 dual retriggerable monostable IC looked like a good candidate for the job. The IC costs less than a buck and is simple to ...
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