Source Follower (CB6153E)

This stage for JFETs was found in a 1965 US publication, but is valid for modern components.

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AC Amplifier MC34071 (CB14475E)
The operational amplifier used in this circuit is not common today, but it can be implemented with...
Triac Test (CB26105E)
This circuit is used to test triacs. It can be connected in series with a resistive load such as...
Transistor as temperature sensor (CB21381E)
In the figure we have the configuration of a transistor as a temperature sensor. The circuit is...