Time delay circuit

Discussion in 'General Electronics Chat' started by llaadd, Jul 19, 2010.

  1. llaadd

    Thread Starter New Member

    Apr 27, 2007

    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