Minimize battery consumption on a 18F2550


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  1. #1
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    Default Re: Minimize battery consumption on a 18F2550

    I changed my mind and I will not use the PICstart board anymore, I will do all on a protoboard.

  2. #2
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    Default Re: Minimize battery consumption on a 18F2550

    The schematic almost works, but I had to change the D and S on the P channel FET. (see the attachment)
    Can someone explain for me how the D and S should be connected for a N and P channel FET?

    The P channel FET is a BS250P and the N channel is a 2N7000.
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  3. #3
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    Default Re: Minimize battery consumption on a 18F2550

    N Fet- Source to ground
    If gate is on higher potential then source, transistor is turned on.
    0V or negative voltage on gate, then transistor is off.
    P Fet -Sourse to positive supply.
    If gate and source are on same potential, then transistor is off. If gate is on lower potential than source then transistor is turned on.

  4. #4
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    Default Re: Minimize battery consumption on a 18F2550

    So a N-channel FET should always have the S connected to the ground and the P-channel should always have the S connected to the positive supply?

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    Default Re: Minimize battery consumption on a 18F2550

    Yes, you are right.

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