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.
Found in an Electronic Design from the 80s, this circuit generates a 500 Hz signal and can be used...
This circuit is from the 1972 RCA Linear Integrated Circuits Manual, but it can be made based on...
At each switch position, a diode is connected in series with the motor, thus causing a small...