This circuit is from a 1968 Electronic Design. The circuit uses transistors of the time that can be replaced with modern equivalents. More stages can be used to get higher tension.
We found this circuit in an American publication from 1977. The circuit drives two LEDs according to...
The Texas Instruments INA826S Instrumentation Amplifier Evaluation Module is available from Mouser...
This circuit is from 1972 but can be implemented with BC558 transistors. The adjustment pot can be...