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 circuit can produce signals up to 100 kHz depending on C1 and R1 adjustment. The output has a...
Found in Radio Electronics this circuit uses a fotodiac to drive a triac. The circuit can use...
This circuit was obtained in an American documentation translated in the 80's. The circuit can be...