This circuit is from an American documentation from 1975. The circuit uses components of the time which can be replaced by modern equivalents. The coupler is homemade with a lamp and a photocell.
This second amplifier is based on the integrated LM108 and has a differential input. The resistor...
Found in a 90s Maxim's documentation, this circuit applies to almost any comparator. | Clique na...
This receiver, called Peace, was manufactured in the 1960s in Japan and was powered by a 9 V...