Active Integrator (CB24390E)

This circuit from July 1975 Radio Electronics uses any operating system with a symmetrical source. The waveform is shown on the side of the diagram.

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Audio Oscillator (CB15834E)
This article was written by A. Fanzeres in the 1970s. We kept the original text. With the circuit we...
3-Transistor Amplifier (CB18837E)
This amplifier can be used for public-address or other applications. Three transistors of the time...
50 MHz Converter (CB20254E)
With this circuit it is possible to tune the signals in the 50 MHz band in a common AM receiver around...