Time delay circuit

Thread Starter

llaadd

Joined Apr 27, 2007
3
hi,

I want to create a simple time delay circuit, I was thinking with a 555 timer or something similar.

The issue I have is that I am modifying an existing circuit which means it has some built in contraints:

Trigger Voltage: ~1V ( I don't know if this will be enough to trigger the timer)
Trigger Duration: 0.5 - 1 second
Circuit Voltage source: 4.5V (if need I can use a higher voltage source and use a pair of resisters to step down the voltage to the 4.5v part of the circuit.)
Output Duration: ~10-15 seconds

any advise would be great, thanks
 
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