Voice activated switch (CB8434E)

This sound or voice relay was found in a Popular Electronics. It includes an amplification stage and can be used as a shield.

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Dimmer (CB5270E)
This dimmer for incandescent lamps was obtained from an American 1990s documentation. The circuit...
sxzVoltage Sextuplicator (CB18620E)
This circuit can be used in physics experiments, in ionization and in several other applications. The...
1-Transistor MW Radio (CB11576E)
This experimental AM radio circuit was found in a 1979 English magazine. It can be fitted with a...