Continuity test (CB9328E)

This audible continuity test was obtained in a book from the 90's describing simple projects. The feeding is done with a single battery.

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Tuned amplifier (CB7445E)
Found in Maxim's documentation, this high frequency circuit uses period components. The graph...
LM390 Intercom (CB25310E)
This two-channel wired intercom was found in the April 1990 issue of Radio Electronics magazine....
XR2206 sinusoidal generator with modified range (CB24497E)
The figure shows how to use the XR2206 to generate sinusoidal signals in a different way. The...