This circuit that has a response from 10 Hz to 700 kHz was found in Philips documentation from 1968. Dual transistors can be replaced by matched pairs.
This circuit is from an old American amateur radio manual. The circuit shows how to use a Varicap...
This simple charger was found in a 1980s documentation. The transistor may be the TIP42 with a...
This circuit split the voltage of a Power supply allowing it to be used as dual supply. The limit...