Digital accelerometer (CB21045E)

Found in Popular Electronics from the 90's, this circuit makes use of components from the time.

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Trigger noise suppressor (CB21459E)
Found in a 1968 Electronic Design, this circuit is intended for suppression of trigger noise in...
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This simple circuit tests general purpose and medium power PNP transistors. When the P1 cursor is...
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I found this circuit in a Popular Electronics from 1992. The circuit shows how we can use two...