Picoammeter (CB6192E)

This circuit was found in a 1980s Intersil documentation. The integrated circuit used is not common today. The power supply must be symmetrical.

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Half step motor control (CB8768E)
We found this circuit in a 90's EDN. The circuit is based on a control integrated that is still...
Schmitt trigger (CB21475E)
In the figure we have the way to use the transistors of an old-paired pair as a trigger circuit. The...
500M-ohm JFET Amplifier (CB26253E)
This very high input impedance JFET circuit was found in the 1995 Encyclopedia of Electronic...