Reverse engineering a counterfeit 7805 voltage regulator
Super informative post. Thanks for sharing.<p>One thing I didn't understand was the author's comment that "I bought the part off eBay, not from a reputable supplier, so it could have come from anywhere."<p>A 5-pack of quality 7805's can be found on Amazon for $5, including Prime shipping, (e.g. <a href="http://amzn.com/B00H7KTRO6" rel="nofollow">http://amzn.com/B00H7KTRO6</a>),  so what's the incentive to buy parts of unknown provenance on eBay or the like?<p>I ask not being a hardware guy myself, so genuinely curious, as I've heard stories like this before.<p>Again, fantastic overview of the chip, though. I learned a lot.<p>[Edit: spelling]