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 VCO circuit was obtained in the 1972 RCA linear circuits manual. The integrated comparator is CMOS and...
I found this circuit in a 1992 Electronics Experimenter Handbook. The circuit can be easily...
This audio amplifier circuit is from Ibrape's technical documentation from the 70's. The BC177 can be...