4 Aspect Signal Driver
(4 Aspect Signal Driver Rev-b) This board is specifically designed to drive
simply wired 3-4 aspect position signals utilizing 3 yellow LED's in series
for each position by providing 9V to the internal dropping resistors.
Multiplexed outputs allow for direct drive of four 3 or 4 aspect signal heads
mounted along a single 10 wire cable. No extra hardware is required at each
signal head. Manual.
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