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USB PIC Programmer PICKit2 BC557 base resistor

Home › Forums › Project Discussions › USB PIC Programmer PICKit2 BC557 base resistor

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  • January 30, 2016 at 10:11 pm #12094
    Asoke Kumar
    Participant

    I have bought all the necessary parts and would start building the project shortly. However, I have some confusion on using BC557 in place of BS250 (unavailable here). Is the base resistor 1K as suggested or 100k? The latter value has been used in all other circuits that I have come across.
    Anticipating your expert advice,
    Asoke Kumar Bose.

    February 1, 2016 at 4:04 pm #12101
    Ligo George
    Keymaster

    Hi,

    It depends on the required current. You can use 10K, if your target has only the IC. If your target board required more current, you need to change the resistor or even transistor.

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