auto reverse polarity switch

Discussion in 'General Electronics Chat' started by flathead, Dec 28, 2012.

  1. flathead

    Thread Starter New Member

    Oct 10, 2011
    Hi, I'm looking for a auto reverse polarity switch or circuit (small) to be used
    with a on /off switch(mom on), replacing the original forward/reverse switch
    (on-off-on). The original switch operates a battery powered screwdriver gun, 4 to 9 volts dc. It is a low RPM,high torque screwdriver gun.
    The new switch or circuit needs a cycle time of 1 to 2 seconds in each direction (forward then reverse ) continuously when the on button/switch is pressed. Due to space,a mechanical solution isn't practical. I'm all thumbs in electronics. Any help is welcomed and greatly appreciated. thanks
  2. antonv

    Active Member

    Nov 27, 2012
    It would help to know how much current the motor draws especially when it works hard.

    Are you able to measure that?
  3. ScottWang


    Aug 23, 2012
    Switch → NE555 Mono astable → NE555 Toggle Switch → Relay → reverse polarity

    Search on google : NE555 Mono astable
    Search on google : NE555 Toggle Switch