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

M

mark krawczuk

Jan 1, 1970
0
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
 
R

Rich Grise

Jan 1, 1970
0
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.

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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