Full Tester (T1316E)

This circuit of a complete benchtop tester was found on a September 1948 Radio Craft. Circuit includes oscillator, voltage meter, and other features.

Portable ultraviolet source (CB7188E)
This 1965 circuit consists of a small inverter for an ultraviolet lamp. The circuit is from a...
Low Power Wattmeter (CB3876E)
This circuit measures the RF power of oscillators and small transmitters in the range of 0.05 to...
Resistance Simple Bridge (CB5936E)
This simple Wheatstone bridge uses only passive components. We can calibrate R1 in terms of...