Two-tube regenerative receiver (T1595E)

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

Current limiter (CB12807E)
This circuit was obtained in a Texas Instruments 2012 documentation, which consists of a current...
Phase separator (CB8142E)
This circuit was found in a 1964 Electronic Design. It generates opposite phase signals from an...
TTL Logic Probe (CB5913E)
This circuit uses a 7-segment display to indicate the logic level of a test circuit. The power...