Two-tube regenerative receiver (T1595E)

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

Transformerless Power Supply (CB16592E)
Here is a simple source without a transformer for currents up to 50 mA. The voltage depends on the...
Thermostatic relay (CB21285E)
We found this circuit in an old QST magazine. The circuit is powered according to the thermostatic relay...
Field Strength Meter (CB22329E)
This simple field strength meter is from a transistor book from the 60's. The transistor is made...