This interesting reflex receiver used a different component, which at the time was showing up. The receiver is from a 1924 documentation and used a sodion tube.
This application of the RCA integrated circuit released at the time was found in the August 1970...
This circuit indicates the logical level of a CMOS circuit, extracting the power from the circuit...
In this amplifier, the supply voltage is 35 V and the input resistance is 2k2. Equivalent...