Audio Controlled Switch (CB21262E)

This sonic relay or vox was found in a Popular Electronics from the 90's. The power MOSFET can be of any type determining the controlled load.

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DC to DC Converter (CB6580E)
This circuit was found in an American documentation from 1970. We can increase the number of...
Automatic Faucet (CB18147E)
The presented circuit allows to control the valve of a tap. The positioning of the emitter and the...
Operational Amplifier Test (CB11246E)
I found this circuit in an old British magazine from 1976. It is possible to test operational...