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Attention!: I accuse none of the shown component sellers that they sell fake components. The tests were simply not enough so there is a chance that the shown components were all original. 

You can get the shown transistor tester here ;-) (Affiliate links):
Aliexpress: https://s.click.aliexpress.com/e/_AYQh7t
Amazon.com: https://amzn.to/3yRjgrv
Amazon.de: https://amzn.to/39KSoz7

In this video we will be having a closer look at electrical components because there is definitely a possibility that your components are fake/counterfeit. So I will show you why fake components exist, what their problems are and how you can spot them/test them. Let's get started!

Websites/Pictures which were shown/used in the video:
https://www.statista.com/chart/17410/counterfeit-and-pirated-products-by-category/
https://www.newport.com/n/semiconductor-manufacturing
https://en.wikipedia.org/wiki/Die_(integrated_circuit)#/media/File:SN7400_1965.jpg
https://en.wikipedia.org/wiki/Die_(integrated_circuit)
https://www.ti.com/lit/ds/symlink/lm358b.pdf?ts=1652792868118&ref_url=https%253A%252F%252Fwww.google.com%252F
https://www.infineon.com/dgdl/Infineon-IRLZ34N-DataSheet-v01_01-EN.pdf?fileId=5546d462533600a40153567206892720
https://www.infineon.com/dgdl/Infineon-IRF540N-DataSheet-v01_01-EN.pdf?fileId=5546d462533600a4015355e39f0d19a1

Thanks to Keysight for sponsoring this video.

0:00 Fake Components?
1:23 Intro
2:00 How Fake Components come to be
3:11 MOSFET Fake Testing
6:12 OpAmp Fake Testing
8:50 Verdict