How TINY Can I go? The BEST Power Board is here!

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WE-MAIA SMT Power Inductors (shown in this video):
Design Kits:
Würth Elektronik Design Software:
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Shown AliExpress video:

Have a look at my PCB Design Files here:

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In this project I will try to remake an AliExpress PCB. It is a very handy voltage converter that can take a varying battery voltage and convert it into 3.3V or 5V while only requiring very little current (25uA) on the input. Sounds awesome, but the board is way too huge. That is why I try to push the size limits in this video to the minimum. Will I succeed?? Let's find out!

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Thanks to the Würth Elektronik for supporting this video.

0:00 This Board is TOO BIG!
1:31 Intro
2:15 What Components to use?
5:02 Making DIY Version 1
7:08 Testing Version 1
8:35 AliExpress Board Comparison
9:10 Making/Testing Version 2
9:58 Making/Testing Version 3 (Tiny)
11:04 Verdict