OpenSprinkler Forums Hardware Questions OpenSprinkler Bee (OSBee) OSBee Schematic Question

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  • #41589

    iowabaldguy
    Participant

    In the schematic diagram, the symbol for QA1 is a FET type transistor similar to QA4 an AO3400. However, it is labeled as 2N3904 which is an NPN BJT type transistor.
    Should I use the 2N3904 or the AO3400?

    #41601

    Ray
    Keymaster

    Either is fine. 2N3904 (which is a very common BJT transistor) is cheaper than the AO3400 MOSFET, but if you are building a small number of boards it makes sense to consolidate the component type.

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OpenSprinkler Forums Hardware Questions OpenSprinkler Bee (OSBee) OSBee Schematic Question