This Hughes circuit is from 1968. Equivalent modern components can be used. The input impedance is 1000 M ohm.
This circuit converts signals from the longwave band of 350 kHz to 500 kHz to 4.35 to 5MHz. The...
This circuit is from a 1980s documentation, but the configuration can be applied to most modern...
This very low current circuit with the ICM7860 was found in the April 1995 Electronics Now...