This circuit is from an 80's Electronic Engineering. The base is a common operating and 4 single integrated voltage comparators. The circuit directly drives 4 indicator LEDs.
This circuit is from an old publication, from the 80s, since in modern cars this type of circuit is...
The output transistors can be the TIP41 and the BD135 and BD136 drivers. TR1 can be a BC558 and...
We found this circuit in an American publication from the 80's translated into Portuguese. The...