100 kHz Oscillator (CB22379E)

This is the single-sourced version of the previous oscillator. Frequency can be changed by changing C1.

MA1026 Portable Digital Clock and Thermometer (CB24684E)
This is the battery-powered version of the previous circuit. The circuit is from the same Radio...
Elementary Radio (CB15084E)
This is the modern version of the Galena radio in which the detector is a germanium diode (which can...
Remote bell for telephone (CB5987E)
This circuit triggers a remote doorbell when the phone rings. The circuit is for the 110 V mains...