When 3.3v isn't actually 3.3v: USB to Serial adapters

I picked up a couple of USB to serial adapters recently, both of which claimed to switch 5v to 3.3v. It turns out that everything is not a cut and dry as it seems.

Here are the ones I would recommend - 2PCS CH340G RS232 Upgrade to USB TTL Auto Converter Adapter STC Brush Module - http://ebay.eu/2fMPrO2

Here is the other one - http://ebay.eu/2g87fUJ

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