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On/Off timer circuit ???

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theasus

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Hi,

Is it possible to design on/off timer with analog IC and components.

For example I want the output of circuit 10 seconds high and 30 seconds low.(Period 40seconds frequency=0,025Hz Duty cycle=%25) .

I know 555 and or some analog IC for PWM generator but I couldn't find any solution for long period like 40 seconds.

I know timer relay and microcontroller can do but I need analog circuit.

Could you propose anything?

Thanks.
 

Use a simple 555 circuit- ASTABLE OSCILLATOR CALCULATOR

R1=120k, R2=68k and C=220uF Theoretically results t1=29s/t=10s :grin:

**broken link removed**
 
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