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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Scale Expander for Multimeters (CB3912E)
The purpose of this circuit is to add millivolt scales to a common multimeter. Used transistors are...
Parallel Port Interface for PC (NI021E)
This application is not modern since few computers have parallel ports. But you can use this...
Dynamic Microphone Amplifier (CB4729E)
This is a circuit that appears several times in this section and in articles. It is a preamplifier for...