This circuit was obtained from a 1980's QST magazine. The circuit can generate 1 to 15 MHz signals with 1 Vpp at 50 ohms load. Used transistors are still common today.
This circuit converts inductances on two scales into voltages. The circuit was obtained from a...
Placed in the vicinity of a telegraphic transmitter (CW), this circuit produces an audible signal on...
This circuit was found in a 1967 RCA documentation. The components are of the time. The circuit...