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.
I found this circuit on a December 1976 Radio Elettronica. The Italian magazine no longer exists, but...
We found this circuit in the 1977 National Semiconductor Audio Handbook. The circuit produces a...
In the figure we have the basic configuration of a regulator for 12 V x 1 A suggested by Motorola in...