Battery Condition Test (CB4969E)

We found this car battery status monitor circuit in an American 80s manual. The circuit has its trimpot trigger setting by driving an LED indicator.

Temperature Bridge (CB4523E)
This Wheatstone bridge has a thermistor or NTC sensor, allowing the measurement of temperatures by...
Temperature Control (CB4666E)
This circuit was originally designed to maintain the temperature of a brooder at 41º C. However,...
Basic Unijunction Oscillators (CB934E)
The figure shows the basic configurations for unijunction oscillators. They are relaxation...