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[...] plz guide me step by step or a circuit diagram will be most welcome as i am a newbie with only a little knowledge.
Quote from: shyamgenious on March 22, 2011, 06:46:29 AM[...] plz guide me step by step or a circuit diagram will be most welcome as i am a newbie with only a little knowledge. (emphasis mine)Don't even try to charge lithium based chemistries until you have a thorough grounding in both how the batteries themselves work and the circuits required to charge them properly. Your life is worth quite a bit more than the ~$20.00 it takes to buy a lithium-ion charger - be well aware that if mishandled, overcharged, overdischarged, or even looked at wrong, lithium batteries might explode - and the lithium inside them is highly flammable. Even more so, working with mains electricity is something that is in itself highly dangerous - accidentally touching live wires will leave you in the hospital for weeks. I hope that you will redirect your efforts to save your own life =).
Quote from: rbtying on March 22, 2011, 08:24:24 AMQuote from: shyamgenious on March 22, 2011, 06:46:29 AM[...] plz guide me step by step or a circuit diagram will be most welcome as i am a newbie with only a little knowledge. (emphasis mine)Don't even try to charge lithium based chemistries until you have a thorough grounding in both how the batteries themselves work and the circuits required to charge them properly. Your life is worth quite a bit more than the ~$20.00 it takes to buy a lithium-ion charger - be well aware that if mishandled, overcharged, overdischarged, or even looked at wrong, lithium batteries might explode - and the lithium inside them is highly flammable. Even more so, working with mains electricity is something that is in itself highly dangerous - accidentally touching live wires will leave you in the hospital for weeks. I hope that you will redirect your efforts to save your own life =). im not that stupid and i correct-i have considerable knowledge about electronics and have made many sophisticated things like a rc boat and automating my lab .i have also built a low cost less energy consuming air conditionor made from...(its a secret) .i am trying my hand in robotics just recently and have researched a lot on the subject.forget about the li-polymer batteries,just simply tell me how to convert ac to dc (is it the reverse?? ) to fuel my electronic appliances which usually need voltage below 5v.
but i have wall warts with adaptors meant only for their specific devices.how can i modify them??i dont even know if a laptop charger is a wall wart.i jus read up the definition in wiki.
How to modify a wall-wart:1) Find a wall wart with an output rating of something like this: Voltage: (anywhere from 9v to 16v) Current: (more than 500mA, otherwise it's practically useless)2) Buy a cheap regulator (linear or switching, probably linear for the first time)3) cut off the ending on the wall wart and use a multimeter to find which one is ground4) solder the bare wires into a protoboard or use a screw terminal for them5) Hook up the regulator as required (here's instructions for a 7805: http://www.afreeland.com/node/16)6) Use the regulated output and have fun.
even the chemical smell from a shorted battery can make you pass out instantly and DIE!!!