This receiver is from a 1924 Gernsback publication. The receiver has good efficiency when powered by the indicated voltages. Listening is through a high-impedance phone.
Molex is using the FFC / FPC Premo-Flex jumpers for inter-board and inter-plate interconnects...
This circuit was found in an American publication from 1968. The transistors are from the time,...
This circuit is from 1971 documentation. It generates a ramp given by the input signal. The FET...