Using the name of varactor this circuit was found in the Radio Electronics magazine of July 1982. Varicaps of any type can be used and the components selected according to the component.
This very low power amplifier is designed by Amperex for hearing aids. It is based on TAA370 which is...
The integrated circuit used in this configuration is uncommon today. The diodes are for general use...
This logic circuit that transfers the level from one gate to the next with each clock pulse was...