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.
This timer, like the previous circuits, uses a currently uncommon integrated circuit. The time is...
This circuit indicates the polarity of a voltage applied to the input. The circuit can make use of...
The circuit shown below was found in the National Semiconductor Linear Applications Handbook...