Negative Feedback Stage (CB6131E)

This circuit is from a 1967 US publication. The configuration can serve as a basis for designs with modern components.

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Limit comparator (CB9591E)
This is the traditional configuration for a limit comparator or window comparator, using two...
Metronome using operational (CB22060E)
We found this circuit in an English publication. The transistor can be BC549, and the power supply...
General Purpose Preamplifier (CB925E)
This simple preamplifier with two transistors may be used in a wide range of applications. The...