Alternator monitor (CB8955E)

This circuit for automotive use was found in 90s American documentation. It is possible to monitor the functioning of a car alternator.

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Isolated control (CB9274E)
The 1: 1 transformer on this circuit found in a 1967 Electronics World can be wrapped around a...
Simple Amplifier Stage (CB232E)
This simple stage can operate with low frequency signals (audio), driving a small lodspeaker....
750 Hz Sixth Order Bandpass Filter (CB13566E)
This circuit has a gain of 6 and a Q factor of 8.63. Operational amplifiers are common, like the...