pulse motor and hall efffect circuit

Discussion in 'The Projects Forum' started by jasonspinmaster, Jun 12, 2008.

  1. jasonspinmaster

    Thread Starter Active Member

    Mar 1, 2008
    Hi all,
    i am building a pulse motor with six north facing magnets.
    i am using a hall effect switch as the trigger to fire the coil, but i am having some problems with the circuit.
    i connect up the circuit and i do not get a pulse. But when i remove the diode from the power transistor. the power transistor saturates, and stays on.
    if i remove the 1K resistor, again nothing happens to the circuit, but when i replace the resistor the transistor saturates. i have tried a few resistors but with no luck,
    my power transistor is a 2SD729H
    power supply is a 12 volt motor bike battery
    can any one help please.
  2. SgtWookie


    Jul 17, 2007
    Which Hall-effect switch are you using? (There are a LOT of different Hall-effect switches out there.) Link to the datasheet for it, please?

    You don't show the connection to +12v for the 1k resistor and the coil/diode combination. Didn't you mean to connect them?