Scratch filter (CB22152E)

This filter for scratched disc noise was found in an English documentation from 1989. The integrated circuits used are still common today.

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Phase Shift Oscillator (CB12065E)
In the figure we have the traditional configuration of a phase shift oscillator that produces a...
Buzzer (CB17504E)
This circuit produces an intermittent sound in a ceramic piezoelectric transducer, for example, a simple...
Adapter for Multimeter (CB1360E )
If you have a common analog multimeter, you can increase its input resistance in the measurement of...