This circuit was found in an English publication from the 70s, an article that teaches how to calculate instruments. The circuit is still current and can be built with an analog indicator of 100 uA.
This circuit was found in a Delco 1965 publication. Transistors may be current equivalents according...
This circuit was found in documentation from the 1980s. The circuit uses several components of the...
This circuit provides an accurate measure of the internal resistance of an analog instrument. Just...