Small/Cheap Galvanometer Needed

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SUMMARY

The discussion focuses on sourcing a small and affordable galvanometer for measuring small currents. Participants clarify the need for a device capable of detecting microamperes or milliamperes, emphasizing the importance of both size and measurement range. Recommendations include purchasing galvanometers from eBay, with links provided for specific models, including zero center panel meters as alternative options. The conversation highlights the distinction between the physical size of the instrument and the current measurement capabilities required.

PREREQUISITES
  • Understanding of galvanometer types, including ballistic and zero center panel meters.
  • Knowledge of current measurement units such as microamperes and milliamperes.
  • Familiarity with online marketplaces for electronic components, specifically eBay.
  • Basic electronics principles related to current detection and measurement.
NEXT STEPS
  • Research the specifications and applications of ballistic galvanometers.
  • Explore the functionality and use cases of zero center panel meters.
  • Investigate the differences between measuring microamperes and milliamperes in practical applications.
  • Learn about the calibration and setup of galvanometers for accurate current measurement.
USEFUL FOR

Electronics hobbyists, experimental physicists, and anyone involved in low-current measurements or seeking affordable galvanometer solutions.

Physicist
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Hello,

I'm doing an experiment and need a small and cheap galvanometer. Does anyone know where can I find it?

Regards
 
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What do you actually need to measure? A small current or a small voltage? What magnitude?

Does the instrument need to be a ballistic galvanometer, or would a short time constant be ok?
 
A need to detect small currents and indicating the direction of them.

Any galvanometer would be ok.
 
How small? A milliampere? A microampere? A nanoampere? A picoampere?
 
I meant small = small in size (not the range).
 
You said "A need to detect small currents and indicating the direction of them."

That's "small currents", which has nothing to do with the physical size of the instrument.

How small are the currents you need to detect?
 
microamps or even milliamps would be OK as I can vary the other components.
 

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