This circuit was found in an American 1990s documentation. It can directly trigger a triac when light is detected by the sensor. The integrated circuit is common, like the 741.
This circuit produces a warning signal with the programmed current that can reach 4 A. The circuit is...
Found in an old American documentation this FM modulator makes use of a varactor diode. The...
This circuit was obtained in Motorola documentation from 1969. The transistors are from the time...