Two-tube regenerative receiver (T1595E)

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

Timed Sequential Controller (CB4453E)
This circuit found in a 1988 documentation consists of a timer or sequential timer controller. The...
Motorcycle Alarm (CB6487E)
We found this circuit in a Popular Electronics of the 90s. The MOSFET can be of any type,...
Missing Pulse Detector (CB13046E)
The circuit shown in the figure is quite interesting in control and alarm applications. This...