This circuit was found in a 1980s American documentation. The data circuit has a low speed, according to the components used. Transistors support modern equivalents.
This simple charger for AA, C and D batteries was found in Elementary Electronics from 1977. The...
This analog video fader circuit smoothly transitions between two signals. It was found in the...
This circuit is based on an operational amplifier that is uncommon today, but that can reach the...