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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WWV Converter (CB9329E)
With this converter it is possible to tune the signals of the 15 MHz WWV.in AM receiver. WWV is...
100V Negative power supply (CB21182E)
This negative voltage source was found in a Popular Electronics from the 90's. The transformer has 120V...
Acoustic Pickup Preamplifier (CB13838E)
This circuit is from the Audio Handbook of the National Semiconductor of 1977. Its purpose is to...