Component Tester in a Keychain
Test any electronic component with this pocket tester
Component Tester in a Keychain launched on June 27, 2020 with 2 votes. The site was still online in September 2026, 6 years on.
What it does
Component Tester in a keychain is a universal testing device for electronic components. It can automatically detect the plugged-in component and measure the desired parameters without having the user to manually select the type, unlike the multimeter.
Thumb-drive sized Universal Component Tester
To make the experience fit your profile, pick a username and tell us what interests you. This project was created on 07/23/2020 and last updated 6 years ago. Being an electronics engineer, I always wanted to have a portable component tester, which could test every electronic component out there. In 2016, I built myself a  Component Tester  based on  AVR TransistorTester  by Markus F. and Karl-Heinz Kübbeler . Following that, I redesigned the Component Tester to size of a keychain . Since makers, engineers and hobbyists have a computer around our work-desk always. So I thought to myself why not build a component tester that could be used as a USB accessory…from hackaday.io
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