4 Aspect Signal Driver Rev-b

(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.