Two-tube regenerative receiver (T1595E)

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

Water Pump Automatic Control (CB18626E)
This circuit was found in a 2006 publication. It uses discrete components and CMOS that are still...
10W Amplifier LM1875 (CB25523E)
We found this circuit in the November 1992 issue of Radio Electronics magazine. The circuit has...
Emergency Light (CB18036E)
This simple circuit, from a 2006 documentation, activates a 12 V lamp in the event of a power...