Two-tube regenerative receiver (T1595E)

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

Universal 555 Triggering Pulse Generator (CB25506E)
We found this circuit in the September 1992 issue of Radio Electronics magazine. It can be...
Current to voltage converter (CB9337E)
This circuit adds an amplifying transistor that can supply loads of up to 250 mA. The circuit is...
Notch Filter 3 to 20 dB Bandwidth (CB6714E)
This circuit was found in a 1964 Electronic Design. The transistor may be a current equivalent of...