Two-tube regenerative receiver (T1595E)

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

Self-biasing JFET stage (CB25566E)
This circuit was found in Electronics Now magazine and can be applied to any JFET. The circuit has high...
Operational Constant Current Source (CB13407E)
This circuit is from a 1977 National Semiconductor integrated circuits manual. The circuit admits...
Commercial 4-Transistor Radio (CB18321E)
This is a commercial radio circuit for 1967 AM. It was found in Japanese documentation. The...