This commercial radio with 3 earphone listening transistors was manufactured in Japan in the 1960s. The medium-wave circuit uses germanium transistors and is powered by a 9 V battery.
Found in a 90s documentation, this switch that is also sensitive enough to operate capacitively uses...
This circuit was found in an integrated circuit manual from the 1980s. The circuit can be designed...
This powerful and sophisticated power supply was found in a 1998 publication. The circuit must...