Logic Level Change Indicator (CB21026E)

This circuit was found in NASA documentation from the 1990s. The monostable multivibrator admits an equivalent.

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Simple Alarm with Reed Switch (CB3864E)
This circuit emits a sound when a magnetic field, of a magnet, for example, approaches the sensor....
Zero Crossing Detector LM139 (CB15251E)
This circuit is from the 1993 Motorola Linear Interface Circuits. The source does not have to be...
8 MHz crystal oscillator (CB8049E)
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