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Discussion in 'Electronic Basics' started by kell, Jul 25, 2006.

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  1. kell

    kell Guest

    billymc:

    Here's the diagram that wouldn't display correctly on the fieldlines
    discussion board:

    Batt+
    |
    |
    +--------------+------------------------+---,
    | | | |
    | | relay ) -
    / / coil ) ^ 1N400X
    \ \ ) |
    / / ,--/\/\/\--, +---'
    \ \ | | |
    / | | |\ | |D
    \ <--/\/\/\/\-------+---|+\ | |--
    / | | >---+-----|| n-channel
    \ +--------|-/ |-- mosfet
    / | |/ |S
    | | |
    | / gnd
    gnd /_ 5.6 v zener
    |
    gnd

    Use the contacts of the relay (not shown) to connect the battery to a
    dump load.
    This way you won't have any heating of transistors and such.
    Note that hysteresis (the feedback resistor to the op-amp pos input) is
    necessary with this circuit
    to prevent chattering of the relay.
    The dump load will turn on at a certain voltage and hold on until the
    battery
    drops to a certain lower voltage, determined by the values of the
    resistors on the input of the op-amp.
    You can look up op-amp hysteresis or similar terms in Google, and you
    will find the formula
    to calculate resistor values that will give you the exact voltage
    window you want.
     
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