In SX Microcontrollers, SX/B Compiler and SX-Key Tool, pwillard wrote:

The 5 Volt wal warts are usualy designed to be used with Cell Phones and the like.  These do require a better supply voltage regulation, but be warned... I've seen a few of these for cell phones that claim 5 volts DC out that used capacitive coupling and a zener.  (No smps or transformer).

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