Connect with us

Time Delay circuit

Discussion in 'General Electronics Discussion' started by seeking001, Nov 11, 2012.

Scroll to continue with content
  1. seeking001

    seeking001

    2
    0
    Nov 11, 2012
    I would like to build a time delay circuit from a 555 chip. I want the circuit wired so that when the 'ON' button is pressed and held, the LED will not illuminate until 4 seconds after the button was pressed, following this the LED will remain illuminated until the ON button is released to the OFF position.

    Is this something simple, if so does anyone have a quick schematic?

    Thank you all!
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,585
    2,360
    Nov 17, 2011
    Use the pushbutton to turn on the power to a 555 based monoflop.
    Build a monoflop configuration that is edge-triggered by the turning-on of the power (e.g. connectthe trigger input to Vcc). Set the delay to 4 seconds. Drive an LED by the output of the monoflop.
    At turn-on the monoflop will be triggered and the LED is off. After the delay the monoflop resets and the LED will turn on until the pushbutton is released (loss of power to the circuit).

    Harald
     
  3. seeking001

    seeking001

    2
    0
    Nov 11, 2012
    Thanks Harold.

    Now...to find out what a 555 monoflop actually is :)
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    10,585
    2,360
    Nov 17, 2011
  5. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    What's the supply voltage? Is this a common 20mA LED?

    Chris
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-