This circuit comes from a Gernsback Publications of the 90s. The circuit uses a general-purpose transistor as a sensor. The power supply must be symmetrical.
This circuit controls loads powered by the power grid, remembering that it is a half wave...
This circuit was found in an old Electronic Design. It makes use of sidacs and operational not very...
In the figure we have the way to compensate an operational amplifier. The circuit is valid for...