Active three-tone filter (CB20808E)

This circuit was found in an American documentation and can be added to common amplifiers of any type. The transistor can be any general purpose.

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Economic Timer (CB16468E)
This timer uses common components today. It activates a relay after intervals that can be adjusted up...
AD7779 24-bit ADC Simultaneous Sampling (COM116E)
September 2016 - It can be obtained from Mouser Electronics the new ADC AD7779 from Analog Devices with...
Battery Saver (CB7134E)
Found in Popular Electronics from the 90s, this circuit consists of a timer that turns off the...