The idea of this circuit found in a Radio Electronics from January 1966. The idea of the circuit is to improve the reception of audio signals, mainly telegraphy, working as a filter.
This low-power transistorized amplifier was found in documentation from the 90s. The circuit uses...
This circuit is from Popular Electronics from March 1991. It can still be assembled with the...
The voltage of this symmetrical power supply depends on the regulating integrated circuits, which...