PMWs, MOSFet H-Bridges, and potentiometers

Discussion in 'Homework Help' started by Tesladisciple, Dec 6, 2010.

  1. Tesladisciple

    Thread Starter New Member

    Dec 6, 2010
    3
    0
    Hello everyone, I am in need of some lab help.

    My dilemma is that I have to combine a PWM signal produced by an SG3524 chip and potentiometer with an H-Bridge using 1N4148 diodes,VN0104 MOSFET, VP0104 MOSFET, two switches and a 7404N chip in order to control the speed and direction of a 5V motor.

    I have had no problem constructing either circuit and both work wounderfully on their own accord.I am just very unsure of a good design that will not distort the already weak PWM signal.

    As mentioned before hand I a doing this in a lab so I will have access to a wide array of resistors and capacitors.

    However,I have to mention that I am not allowed to use a PIC to help control the motor.

    Any ideas or schematics would be a big help.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    It probably would help a lot if you produced a schematic. H bridges are common critters to find examples of. Since you have made "either" circuit, it should be a snap.

    Are you sure about those 1N4148's. You might want to look at a data sheet.
     
  3. Tesladisciple

    Thread Starter New Member

    Dec 6, 2010
    3
    0
    [​IMG][​IMG]I'd be more than happy to provide some schematics, and the instructor was very specific on the 1N14148 diode.

    I'll put up the H-bridge up first since I'm going to have to make a schematic for the PWM circuit.
     
  4. Tesladisciple

    Thread Starter New Member

    Dec 6, 2010
    3
    0
    Last but not least the crudely made schematic of the PWM circuit.
     
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