Charger D ripple

Mobile charger has become one of the most popular accessories/consumables for smart-phone (thanks to Apple’s non-removable battery design). Being a heavy mobile internet user, I have accumulated several mobile chargers, ranging from top-of-the-line Energizer “Energi To Go”series, to homebrew single 18650 lithium battery¬†adaptor. All of them have proved to charge mobile phone well. But are they good enough to power testing circuits for lab use? I cannot have good confidence until I tear them apart and measure their performances. Continue reading