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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Symmetrical regulator (CB23782E)
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This complete video game circuit was found in the May 1978 issue of Radio Electronics magazine. The...
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This circuit sequentially drives loads connected to its outputs or even applies the signals to the...