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0-30S astable with LM555

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fjpompeo

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Hi all
I need a astable multivibrator to drive a two camera monitor. The switching time must be adjustable bewtween 0(no output pulse) and 30s. That way I can monitor only one camera or automaticaly time delayed two ones.

If possible this circuit must be build around a LM555 or similar timer or even usig the classic two NPN transistors adjustable oscilator.

Regards,

Fernando
 

LM555 does not suits your needs. Better go for microcontroller if you need precise timing

Nandhu
 

You should be able to get 30 seconds out of the LMC555. You need to be very careful in your choice of capacitor otherwise leakage could stop it working.

Keith
 

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