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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Harmonic distortion meter (CB7942E)
This 1 kHz circuit was found in American documentation from the 90s. The original operational...
Remote bell for telephone (CB5987E)
This circuit triggers a remote doorbell when the phone rings. The circuit is for the 110 V mains...
Balanced Microphone Preamplifier II (CB4944E)
This circuit was obtained from an American publication of the 80's. The integrated circuit is of the...