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basic optocoupler switcher schematic for eprom needed.....

Discussion in 'Electronic Design' started by mark krawczuk, Mar 7, 2007.

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  1. hi, would anybody be able to supply me a link/schematic to build a
    optocoupler switcher for a eprom ? (4n25 opto ???)
    i want to be able to switch banks in a 27c128 etc eprom via long wires
    connected to a mechanical switch.

    thanks,
    mark k
     
  2. Rich Grise

    Rich Grise Guest

    There's nothing to it. Take a battery, a switch, a twisted pair, and
    a resistor (probablly one at each end of the wire, totaling the correct
    current-limiter value) to the LED, and run a pullup resistor from the
    optotransistor's output to +Vcc, and drive the address line with that.
    You might want to buffer it a little, and do some debouncing, but they're
    easy to look up.

    Have Fun!
    Rich
     
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