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.
This circuit uses a common multimeter on the voltage scale. The calibration of the scale should be...
This circuit can generate signals in the range from 1 to 20 kHz, depending on the crystal. The...
This configuration, found several times on this site and in other articles, can generate...