Autocutoff and restore

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Pitamber Kaushik

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I need (edit) an analog circuit that upon switching on, after a few seconds, deactivates for a constant time (of the order of few hours), during which subsequent presses don't turn on my load (an LED). After the passage of that duration of a few hours, the circuit again becomes active for a single press and so on. Please help.
 
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Use a micro-controller, and program it to do the job - it will require very few components, and fairly simple software.
 
Pitamber Kaushik said:
Thanks. I was eyeing an Analog Circuit. The time duration is too high for Capacitors to be practical. Is there some other way?
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There's always 'another way', but it will be much more complicated, much more expensive, and probably much less accurate.

One 8 pin PIC, an odd resistor and capacitor, and that's the lot for a micro-controller.
 
The easiest approach for such a long period, other than a uc, is to use a CD4060 counter/oscillator, such as shown here.
 
crutschow said:
The easiest approach for such a long period, other than a uc, is to use a CD4060 counter/oscillator, such as shown here.
Click to expand...

Which is still pretty inaccurate as it uses a crude free running oscillator, and considerably more parts than a PIC version would - where the internal oscillator would be many times more accurate, even though it's not a crystal.
 
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