Hartley for 1 MHz (CB25588E)

This oscillator was found in the July 1993 Electronics Now magazine. The coil is wound with 28-wire in a 0.5 cm shape.

Sinusoidal Oscillator (CB9189E)
This circuit was found in an Elektor from the 90s. The circuit uses common components even today,...
Injector and Continuity Tester (CB4452E)
This useful instrument has dual function, operating both as signal injector and continuity tester. The...
Geiger Detector (CB4390E)
This circuit was found in a 1962 publication. At the time there were high voltage batteries like the...