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Do you have a source for those cheap little 9v to 5v/3v3 pcbs? I have only found them on kits from amazon.
I wouldn't call them cheap, but for $0.71, pretty inexpensive ;) https://www.aliexpress.com/item/33044576815.html?spm=a2g0s.9042318.104.22.168684c4dCMgTOg
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