This circuit was obtained from the February 1992 Radio Electronics magazine. In it, a bar of 4 LEDs flashes continuously at a speed given by C1 and the setting of R3.
This precision circuit was found in ancient American documentation. The most critical component is the...
Using an LDR, this Philips circuit directly activates a relay when light strikes the sensor. The...
This circuit can be used to obtain control signals from an infrared emitting source. The circuit is...