This LED flasher was described in the Radio Electronics Experimenter magazine special issue of 1989. It was designed to be assembled with SMD components.
This is the normal configuration for the TDA2003 integrated circuit, an amplifier that can provide 10...
Found in an English publication from 1977, this circuit uses only 1 LED. Unlit means heads and lit...
In the figure we have the transmitter and the receiver for an optical audio link via infrared. The...