Headlight circuit

When the lights of an on-coming car are sensed by photo-transistor Ql, things get going. Sensitivity is set by the 22-megohm resistor, R5, to about half a foot-candle. The relay used has a 12-volt, 0.3A coil.
Headlight circuit - schematic

The L14C1 is complete with a lens that has a diameter of one inch for a 10° viewing angle.

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