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.
We found this circuit in a 1968 Hughes publication. The components are from the era and can be...
The circuit presented is from the Linear Applications Handbook of the National Semiconductor of...
We found this electronic analog multimeter in a 1998 documentation. What sets it apart from...