This analog volt-ammeter was found in an Electronics World of 1968. It makes use of a 0-1 mA analog milliammeter. Accuracy depends on the components.
The circuit shown is from an old European publication. In it we have the way to activate a relay...
We found this circuit in a European publication from the 1990s. Transistors are still common types...
This circuit was found in an American documentation and can be added to common amplifiers of any...