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
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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