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OpenSprinkler › Forums › Hardware Questions › Clarifying the type of transistor used for the relay output

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  • January 11, 2015 at 9:43 pm #35191

    Richard
    Participant

    Hi there

    I’m building a customised variation of the opensprinkler hardware for a Raspberry PI.  On the various schematics there is a transistor that drives the relay output, with a part number of 2N7002.  On the schematic the symbol used is for a standard NPN transistor, yet the specifications for a 2N7002 is for a N-Channel Enhancement Mode Field Effect Transistor.  Using a standard transistor is more common practice and I was going to substitute a suitable model in, but I thought I’d check to see if there was a specific reason a FET was specified?

    Thanks

    Richard

     

    January 14, 2015 at 6:37 pm #35210

    Ray
    Keymaster

    Both NPN transistors and N-channel MOSFETs are fine. They work similarly.

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OpenSprinkler › Forums › Hardware Questions › Clarifying the type of transistor used for the relay output