Any components to determine the charges?

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Discussion Overview

The discussion revolves around the design of an electronic electroscope that can determine the polarity of electric charges. Participants explore various components and circuit designs that could enhance the device's functionality, focusing on both theoretical and practical aspects.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that a circuit could indicate charge polarity by drawing more current for positive voltage and less for negative voltage.
  • Another participant shares their experience with a similar circuit using a meter instead of an LED, noting that the FET used was prone to damage.
  • A request is made for recommendations on FETs with built-in static protection, as the participant has difficulty finding suitable models locally.
  • Another participant asks for suggestions on substitute components that could be used in the electroscope design to determine charges.

Areas of Agreement / Disagreement

There is no clear consensus on the best components to use, as participants propose different ideas and seek further suggestions, indicating that multiple competing views remain.

Contextual Notes

Participants express uncertainty regarding the availability of specific components and the reliability of suggested designs, highlighting potential limitations in sourcing materials and the durability of components.

Who May Find This Useful

Individuals interested in electronics, particularly those working on projects involving charge detection or electroscope design, may find this discussion relevant.

oem7110
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I would like to make an electronic electroscopes based on following concept, but its design cannot determine whether the charges are positive or negative.
Does anyone have any suggestions what kind of components I can add into this device to determine the charges?
Thanks in advance for any suggestions

http://amasci.com/emotor/chargdet.html
 
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That circuit will draw more current if the voltage is positive and less if it is negative, so you can easily tell which is which.

I built something similar years ago, with a meter instead of the LED, and it worked, but the FET tended to get destroyed fairly easily.

I suppose you could hunt for FETs with built-in static protection.
 
vk6kro said:
That circuit will draw more current if the voltage is positive and less if it is negative, so you can easily tell which is which.

I built something similar years ago, with a meter instead of the LED, and it worked, but the FET tended to get destroyed fairly easily.

I suppose you could hunt for FETs with built-in static protection.

Do you have any suggested model for FETs with built-in static protection?
The store only provide service within US, and I cannot find this model in my local area. MPF102 Field Effect Transistor (FET)

Do you have any suggestions?
Thanks you very much for any suggestions
 
Does anyone have any suggestions on any substituted components I can use into this device to determine the charges?
Thanks everyone very much for any suggestions
 

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