Code Sidetone Generator (CB26323E)

This code practice circuit was found in a 1990s issue of Radio Amaterur Today magazine. It produces an audio tone with the 555.

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Automatic Doorbell (CB16652E)
This circuit was found in a 1992 publication. Its purpose is to time the activation of a doorbell...
Fuel Gauge (CB26016E)
This automotive circuit was found in the June 1997 issue of Electronis now magazine. The circuit uses...
Tuned Coil Hartley Oscillator (CB25940E)
This oscillator was found in the January 1996 issue of Electronics Now magazine. The frequency is given by...