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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Modulated Siren 555 (CB13190E)
We found this circuit in an American publication from the 1970s. The MC1555 is the version of the...
Common gate stage (CB7470E)
This circuit for FET was obtained from a 1977 Radio Handbook. The input impedance is 150 ohm. The...
Ultrasonic Alarm Receiver (CB13979E)
This is the receiver circuit for the CB13978B, found in the same 1977 Elettronica Prática...