We found this circuit in a 90s Linear Technology documentation. The circuit uses components from the time and the indicator is of the analog type.
This is a multi-component tester with visual indication by LED and polarity selection in the test....
This circuit is from the 80's component manual itself, but can be applied to more modern...
This amplifier uses a 1975 integrated circuit, which is uncommon today. The circuit has a gain of 30...