Two-tube regenerative receiver (T1595E)

This circuit is from a Radio Electronics from 1949. The circuit is battery powered and has high impedance listening.

Capacitor Test (CB12270E)
We found this circuit in a 1978 publication. The diodes can be 1N4002 or 1N4004 and the secondary of...
Gain 5 Operational Amplifier (CB14035E)
This inverter amplifier is suggested by a technical documentation from Texas Instruments. The RF...
FSK Circuit (CB25781E)
This frequency shift modulation circuit was found in the November 1994 issue of Electronics Now...