Phone noise canceler (CB9402E)

This circuit was found in a 1967 American documentation. The circuit uses components of the time, applying to analog lines.

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Milliammeter Scale Expander (CB4773E)
This circuit was found in a Popular Electronics of the 1990s. Its purpose is to expand the scale of...
Transistor Amplifier - TIP31 / 32 (CB1004E)
This circuit consists of a traditional version amplifier with complementary output transistors...
Analog to digital converter (CB20540E)
Indicated for applications with a PC, this circuit was obtained in an English publication in 1992....