This 80's Hands On Electronics circuit automatically switches from high light to low light when an oncoming car illuminates the sensor. The circuit is powered by the car's own battery.
One of the problems with common 3-terminal regulators is that the internal reference, normally 1.25 V,...
This windshield wiper interval was found in old documentation. The NPN transistor is general...
This circuit was found in a Radio Escuela Gráfica magazine from Argentina published in the 70's....