pwm controller

Discussion in 'General Electronics Chat' started by bruno, Nov 25, 2004.

  1. bruno

    Thread Starter New Member

    Nov 25, 2004
    3
    0
    gentlemen,

    I am rather new in the electronics. I have build a scale model P51 mustang scale 1/144. I have added an electrical motor. This motor is coming from a GSM ( vibra motor). The motor is powered by a 1.5 volt AA battery.
    I would like to control the speed of the motor (to have a scale effect) the idea is to use a 555 ic as a base for a pwm control. Now my question: aal the scematisch I can find on the net uses electrical motor powered on 12 volts; (the powerscource for the motor and the ic is the same)
    voltage pulses on the schematic I have found is controlled by a MOSFET (BUZ11 or NTE2389).
    How can I control the speed of my 1.5 volt motor?
    I add my schematic

    Thank you

    Bruno Vanclee
     
  2. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    hi

    how much are you going to supply your control device. if am not mistaken the 555 can operate only as low as 3v. with 1.5v it wont function.

    you still have to add another device in order you can fully control the speed. :)
     
  3. bruno

    Thread Starter New Member

    Nov 25, 2004
    3
    0
    I KNOW, I would like to use a battery of 9V for the 555 and a battery of 1.5V for the engine.
    Can i replace the mostfet with an optocouple?

    Bruno
     
  4. mozikluv

    AAC Fanatic!

    Jan 22, 2004
    1,437
    1
    hi,

    yes you can or you can even use an ordinary TO-92 transistor as long as it can handle the current draw of your motor. :)
     
  5. bruno

    Thread Starter New Member

    Nov 25, 2004
    3
    0
    thanks I will try,

    Bruno
     
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