Transistor gain meter (CB20522E)

This circuit was found in a publication in the 1950s, mainly applying to germanium transistors of the time.

Variable Frequency Oscillator with Crystal (CB4046E)
This circuit generates signals that can be adjusted in a small range around the frequency of the...
Temperature transmitter (CB9392E)
This circuit is a wireless temperature transmitter for RF signals in the range of 0.2 to 2 MHz...
Guitar Distortion Generator (CB18130E)
The circuit shown works by the action of a foot switch and must be inserted between the guitar and the...