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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Rhythmic Light (CB16411E)
I found this simple basic circuit of rhythmic light in a 1980 documentation. We warn you to be...
Fast Answer Game (CB10810E)
This circuit was obtained in the publication 101 Electronic Projects of 1979. The circuit can also...
Triac Motor Control (CB1312E)
This circuit has some differences from the conventional types of control in which the delay in the...