Voice activated intercom (CB7828E)

This one-channel circuit was found in a 90s Popular Electronics, functioning as a vox. Components are common today.

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Wind Indicator (CB23981E)
This electronic “windsock” is operated by a magnetic switching system. It was found in a Radio...
Automatic TV turn off (CB10090E)
This old circuit from a documentation from the 70s disconnects a TV from a signal obtained on the...
Ceramic Resonator Clock (CB16002E)
The circuit in the figure is suggested by Murata for an uPD75380 microprocessor and is based on a...