60's crystal radio (CB22171E)

Found in an English publication from the 1960s, this circuit uses period components, including the commercial grade coil.

RF Sensor (CB4117E)
This circuit is a kind of Hertz Loop that can be used to check the operation of transmitters and...
Headphone Amplifier (CB26277E)
This high-impedance headphone circuit was found in a 1990s William Sheets. The power is low, but...
Ramp generator for stepper motors (CB21604E)
Based on the 555, this circuit was obtained from Internet documentation, serving to generate a...