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Timer circuits. (Basic Circuitry).

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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