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 circuit was found in a Popular Electronics of the 90s. The resistor R4 determines the load...
This circuit is intend to be used with low impedance transducers like magnetic pick-ups for...
This circuit functions as a variable capacitor controlled by a potentiometer, multiplying the...