Intermittent power for solenoid

Discussion in 'The Projects Forum' started by Laura1, Feb 21, 2015.

  1. Laura1

    Thread Starter New Member

    Feb 21, 2015
    Hello People,

    I was wondering if you guys might have an idea for a project I'm working on. I've made a solenoid that attracts a thumbnail when powered with a DC battery. But I want the thumbnail to oscillate, so to go back and forward. Is there an easy way to automatically switch the current on and off? Preferably not too big or expansive? (The coil requires 0,65A).

    Thank you for your help in advance.
  2. shortbus

    AAC Fanatic!

    Sep 30, 2009
  3. Laura1

    Thread Starter New Member

    Feb 21, 2015
    Thank you for the response. Yes, that might work. Guess I'll try that one.
  4. Reloadron

    Well-Known Member

    Jan 15, 2015
    If you want the plunger to cycle at a slower rate you would pulse the coil. As it is now when your current is applied the plunger pulls into the coil and will remain there as long as current is applied. When the current is removed the magnetic field of the coil collapses and the action of the spring returns the coil to where it started from. If we "pulse" the coil at a given rate then the coil will pull in, HOLD, release and the cycle will repeat, all determined by the pulse rate or pulse timing. The coil could be On for 1 second and Off for 1 second and repeat or On for 1 second and off for 2 seconds and repeat. Doing it this way will require some external electronics. So there we have another option.

  5. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    have a leaf spring contact in the travel path of the object you want to attract. When it moves toward the electromagnet, it will contact the leaf and break contact. This de-energizes the magnet and the object returns to its starting point. The leaf spring then closes and the cycle repeats