The purpose of this circuit is to measure the resistance of an antenna at the resonant frequency. The circuit is from an old American documentation for hams.
This 2-CK722 oscillator was found in a march 1961 Radio Electronics Magazine. The circuits need...
This PWM control was obtained in an English publication in 1989. Transistor Q2 can be the TIP42 for...
We obtained this circuit from a 1993 documentation. The circuit has current and voltage ranges that...