Simple NiCad Charger (CB26201E)

This battery charger was found in the Electronics Experimenter Special Projects of 1983. The circuit uses an SCR as the control element.

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Stepper motor as encoder (CB21248E)
In the figure we have the way to use a stepper motor as an encoder. Operational amplifiers can be of...
Refrigerator Alar (CB1351E )
Placed inside the refrigerator, this circuit triggers an oscillator when the part is opened...
Smoke Alarm (CB13235E)
We found this circuit in an old documentation from the 70s, but it can be assembled with more...