This 3-tube receiver is from a 1924 publication. The circuit has 3 supply voltages and a high-impedance headphone output.
Unlike the previous one, this circuit is intended for the reception of frequency modulated signals...
This modulated light transmitter was found in a 90s Popular Electronics. In place of the lamp with...
This circuit from the 90s, found in an Electronic Engineering can be used as a shield since its...