incredible diy idea using 12V transformer

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hello guys in this video i will show you how to make a led tester using 12v transformer
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▶ Wow !! DIY NPN & PNP transistor tester
▶ https://youtu.be/Wp5o6gsbcYE
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▶ WOW !! Amazing diy idea
▶ https://youtu.be/7g821GwbJbU
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▶ #DIY AMAZING DIGITAL VOLTMETER
▶ https://youtu.be/6ecIFJrIQAs
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▶ how to make an optocoupler tester
▶ https://youtu.be/Mei-Qt37qbg
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▶ https://youtu.be/xYowcQcg_4g
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▶ WOW !! DIY short circuit protection
▶ https://youtu.be/3lXGFom3WFs
#esdiy
#mextraf
#recycled_materials