1. Mohamad Tarabah

    Thread Starter Member

    Jul 4, 2016
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    Hi everyone, I just built my first PWM controller circuit with a 555 timer and it worked ! I connected a mosfet and filtred the signal with a cap. Now my question is what isbthe resolution of this circuit ? And does it make a voltage drop with high current loads ? Does it even work with high currents like 10 amps ?
     
  2. johndeaton

    Member

    Sep 23, 2015
    63
    4
    Hi Mohamed,

    Congratulations! It is fulfilling when a circuit works as expected :). Can you post a schematic and part number of the MOSFET? It will be easier to answer your questions with that information.

    Thanks
     
  3. Mohamad Tarabah

    Thread Starter Member

    Jul 4, 2016
    54
    0
    [​IMG]It's the same exactly but I just didn't put a resistor to the gate and added a cap for filtering noise
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    4,750
    In principle a PWM controller is capable of Much higher than 10 amps, if needed.
    What do you mean 'Filtered the signal with a cap'?
    With a typical inductive load, the voltage represents a square wave, but the current usually consists of a saw tooth, the mean level of which depends on the load.
    Max.
     
  5. johndeaton

    Member

    Sep 23, 2015
    63
    4
    Also, in any electronic circuit, you can use the output of one stage to switch power to another stage with components rated for higher power.
     
  6. Mohamad Tarabah

    Thread Starter Member

    Jul 4, 2016
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    I meant I added a regular filter (resistor + capacitor )
     
  7. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    I can't see your circuit. Did you try posting it here using the 'Upload a file' button below the Reply box?
     
  8. Mohamad Tarabah

    Thread Starter Member

    Jul 4, 2016
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  9. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I don't see any series resistor for the LED?
    Also if using on 6v I would have used a Logic Mosfet.
    If just switching a LED a 2n7000 would do it.
    Max.
     
    atferrari likes this.
  10. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Yes. The IRF540 will drop about 0.8V when passing 10A.
     
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