# Human chain - body conductivity

**URL:** <https://forum.arduino.cc/t/human-chain-body-conductivity/634793>\
**Category:** General Electronics\
**Created:** [February 4, 2020, 4:06am UTC](https://forum.arduino.cc/t/human-chain-body-conductivity/634793 "2020-02-04T04:06:06Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![zoomkat](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/zoomkat/32/1190177_2.png) [@zoomkat](https://forum.arduino.cc/u/zoomkat)\
**Post date:** [February 4, 2020, 7:03am UTC](https://forum.arduino.cc/t/human-chain-body-conductivity/634793/5 "2020-02-04T07:03:50Z")

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The below MPSA13 transistors are very sensitive (MPSA14 even more so). I used one to make a coffee can ion chamber to detect Thorium in lantern mantles. You might also look into capacitive touch sensors for a touch switch.

> **[(5) National Semi MPSA13 NPN Darlington Transistor, TO-92, Tape/Reel | eBay](https://www.ebay.com/itm/5-National-Semi-MPSA13-NPN-Darlington-Transistor-TO-92-Tape-Reel/182357246192?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649)**
>
> Find many great new & used options and get the best deals for (5) National Semi MPSA13 NPN Darlington Transistor, TO-92, Tape/Reel at the best online prices at eBay! Free shipping for many products!

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