Using the LM3909 this circuit was found in the January 1992 issue of Radio Electronics magazine. Resistor R1 should be chosen according to the table given next to the diagram.
Found in a 73 magazine for radio amateurs of the 1980s, this circuit uses a dual-gate MOSFET. This...
This circuit is intended for communications receivers. We can find it in a documentation from the...
This traditional TTL configuration was obtained in a 1977 documentation. The supply must be made...