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12v variable 555 timer circuit with motor

Discussion in 'Sensors and Actuators' started by Harrison Redwood, Apr 5, 2016.

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  1. Harrison Redwood

    Harrison Redwood

    Apr 5, 2016
    I'm trying to make a variable timer circuit that is controlled by a 555 IC running from a 12v supply. I have a basic circuit but for some reason as soon as the circuit is turned on the motor starts spinning and doesn't stop until the power is cut, its like the potentiometer doesn't do anything.
    help would be much appreciated, cheers.
  2. Bluejets


    Oct 5, 2014
    You have threshold and discharge shorted (6 and 7)
  3. cjdelphi


    Oct 26, 2011
    The second issue is the 1M resistor with only a 10k potentiometer , that's going to be a very slow pulse with 220uf it might not even trigger the 555
    Bluejets likes this.
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