One shot power

Discussion in 'The Projects Forum' started by rokz_2005, Jun 6, 2011.

  1. rokz_2005

    Thread Starter Member

    May 14, 2011
    Say I'm using a 6v battery and I wanted a short (300ms of power) via a switch.
    When you hold the switch for more then 300ms the power shouldn't still be able to run.
    How would I make that. Which components do I use? I know it can be done with a 555 timer but is there another way?
  2. #12


    Nov 30, 2010
    There are several ways from a capacitor and a transistor to a microprocessor. The 555 is famous for being the simplest way to get what you want and do it accurately.

    What method do you prefer?
  3. rokz_2005

    Thread Starter Member

    May 14, 2011
    Hi thanks for the prompt reply.
    I need this switch to reset a 555 timer.

    I've already got another thread on this.

    - I gotta hold down the switch for say 1s to activate power (via a capacitor)
    now in order to reset that 1min run I have to 0 volt or make PIN4 low which is usually HIGH. I want to use the same switch.
    Can I use either - SPDT relay to ground...
    - somehow connect a BJT .. I dno how (just a though)
    - a mosfet switch