This 50% active cycle TTL clock generates signals from 4 to 20 Hz. Its power must be supplied with 5 V and other frequencies can be generated with capacitor replacement.
This transmitter for the 40 meter or 7 MHz band was found in a magazine 73 for radio amateurs of...
This shortwave preselector was found in the July 1994 issue of Radio Electronics magazine. The...
This circuit was found in a 1967 RCA documentation. The components are of the time. The circuit...