This circuit was found in a 1969 Mullard publication. The transistor may be the modern equivalent of BC548. Observe the relatively high supply voltage.
Suggested by General Electric this circuit has 3 control positions for one load. The diode is...
This good gain antenna up to 30 MHz was found in an American 1990s documentation. The circuit can be...
This circuit was found in Motorola documentation from the 1980s. The components are of the time,...