This circuit was found in a 90s Popular Electronics. It is possible to analyze the voltages of an automotive battery. The integrated voltage comparator circuit admits equivalent.
This circuit is from an old Mullard transistor manual. The diodes are made of germanium and the...
Similar circuits can be found on this site. This is from an 80's American documentation. The...
We found this circuit in an old American documentation. The table gives the values of the...