This circuit is from a 1968 Electronic Design. The components are from the era and the operating frequency is 60 MHz. No data on the coils is provided.
This circuit was obtained from 1967 documentation. It uses a sensor to determine the trigger...
Found in a 1980s publication, this circuit uses an operational amplifier from that time. The...
Found in an old American publication, this circuit indicates the direction the antenna is pointing in...