12vAuto3to8

by cmaxwell.
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2 layer board of 1.96x2.02 inches (49.73x51.31 mm).
Shared on March 1st, 2016 19:26.

Binary converter for 12v car lights. Used to convert digital (‘ABC’ wires) output from GM transmission to directly power 12v dash lights (P,R,N,D,2,Low,…) in older cars.

IC1: CD4011BE

IC2-4: CD4023BE

R1-8: 1k

R9-11: 4k7

Q1-8: 2N2907

Headers are 5mm screw terminals (though it may be just as easy to solder wires directly in). J16: A/B/C (binary inputs). J17: power and ground. J18-20 power outputs.

Can use jumper J1 to pull inputs high (as I needed) or low.

Can use jumper J3 (and switch 2N2907 transistors to 2N2222) to make this a low-side output switch.

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