Mosfets and RC

Discussion in 'The Projects Forum' started by clarkey.21, Apr 30, 2012.

  1. clarkey.21

    Thread Starter New Member

    Apr 30, 2012
    1
    0
    Hi,
    I am building a mechanical mole for a university project, but i am needing to build a remote control rotating base station. I have an idea to use Mosfets to allow me to use the 3V RC circuit i have built, as the motor i need to use to rotate the base station is a 12Vdc 5RPM motor as i need the torque that the motor provides. Any help with this would be great.
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,087
    3,027
    Whoa, how could anyone help without schematics and other details? We can't read your mind.
     
  3. crutschow

    Expert

    Mar 14, 2008
    12,977
    3,220
    Find a logic-level MOSFET that fully turns on with 3V and has the required voltage and current rating that the motors require.

    Alternately you can use a standard level MOSFET (10V for full on) and use a BJT level shifter to drive it from the 3V.
     
  4. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    I get the first part but the second paragraph eludes me. Doesn't he still need 10Vcc?
     
  5. russpatterson

    Member

    Feb 1, 2010
    351
    16
    I'm interested what the circuit looks like that uses a BJT to 'shift' 3V to 10V. What is this magic you speak of?
     
  6. crutschow

    Expert

    Mar 14, 2008
    12,977
    3,220
    No magic of course. I assume you are taking issue with my use of the term "shifter". ;)

    I was referring to a simple NPN common-emitter inverter stage that is controlled by the 3V signal and switches a higher voltage, such as from the 12V motor supply, to control the MOSFET gate.
     
  7. CDRIVE

    Senior Member

    Jul 1, 2008
    2,223
    99
    And there you have it. I missed that before !!
     
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