1944 Code Practice Oscillator

1944janradiocraftThis simple idea for a code practice oscillator appeared in the January 1944 issue of Radio Craft magazine.

No doubt inspired by wartime parts shortages, the audio feedback loop could be created with an old telephone receiver and microphone placed next to each other. The idea was sent in to the magazine by one Mr. Ivan H. Walker of Mt. Horeb, Wisconsin.

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