We found this sensitive high input impedance voltage amplifier in the November 1970 Radio Electronics magazine. The circuit is powered by 18 V power source.
Found in a 1970s RCA documentation, this circuit generates signals according to the component...
This oscillator using a 455 kHz ceramic filter was found in the May 1970 issue of Radio...
Found in a 90's EDN, this circuit can be used as a shield. The components depend on the MOSFETs...