Burst generator (CB21067E)

Found in American documentation from the 90s, this circuit generates sound bursts according to the digital control.

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Permanent magnet detector (CB22463E)
We found this circuit in Popular Electronics from 1992. Transistors admit equivalents....
Automatic Polarity Switching Voltmeter (CB14856E)
This circuit automatically inverts the test leads connection according to the polarity of the...
Half Wave Fast Rectifier (CB15806E)
This is a rectifier for small intensity signals, and equivalent operational amplifiers can be...