MOSFET Amplifier Stage (CB26315E)

Found in a 1990s Popular Electronics, this circuit uses a small transformer matched to the impedance of the speaker being driven.

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EMP Detector (CB23889E)
Originally intended to detect EMPs produced by tests or atomic blasts, this interesting circuit...
Automatic plant sprinkler (CB20778E)
This circuit triggers a small water pump when the humidity detected by the sensor is reduced in a...
Remote power sensor amplifier (CB7444E)
This circuit was found in Maxim's documentation from the 90's. The configuration uses components...