This transmitter for the 3.5 and 7 MHz ham radio was found in a 1950s Japan publication. No information was given on the coils and the power supply.
This circuit is from a 1970 General Electric documentation. It can be found with variations on this...
This circuit was found in a General Electric documentation from 1970. It is used in an optical...
This circuit was found in a Signetics documentation from the 1980s. The integrated is a PLL and...