Delayed On: Piezo Buzzer Circuit

Discussion in 'The Projects Forum' started by Q1217, Aug 11, 2010.

  1. Q1217

    Thread Starter New Member

    Aug 11, 2010
    Hi everyone. I was wondering if someone could point me in the right direction to figuring out a desired circuit. We're interested in putting together a simple 3-6V circuit that has a push button switch. When the button is first pressed, a momentary buzz sounds (1s) to let the operator know the device is on. After a pre-defined delay, say 20s, the buzzer then stays on until the button is pressed again. I've been trying to search around for exactly what needs to be done and am getting some confusion between 555 and 556 timers. Thanks for any help!