Explorer for all ranges (T1098E)

This circuit was found in a Radio Craft from October 1946. Power supply not shown, and tubes are 1.5V filament types.

LM3600 Amplifier with AGC (CB25149E)
This circuit with automatic gain control was found in the July 1988 issue of Radio Electronics magazine....
Square Signal Phase Detector (CB6670E)
This detector was found in an old Electronic Design using transistors of the time. The circuit can be...
Simple relay drive with transistor (CB25631E)
In the figure we have a simple shield of 1 transistor. The supply voltage depends on the relay. The...