Monthly Archives: September 2012

USB Mobile Phone Charger Using the L7805 Voltage Regulator

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I have a really big problem: my phone needs to be on all day, or at least for 8-10 hours. I own a really old Android phone, and its battery only lasts a few hours at most now. You may be wondering why I don’t just get a new battery and solve all my problems. I have tried three times, and none of the so called “compatible” ones work, but I have another one on the way. In the meantime, I was left with no choice other than to come