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Li-ion Battery Charger
LED Bangle using CD4049
Pepsi Bottle RC boat
DIY Electric PCB Drill Machine
Table tennis ball machine
Hey nice to see that you did. Maybe you could also add the links to the modules you used in the instructable.
I just did in quite a bit of hurry...
NP...We all are!
Book Case for Tablets
It is quite unnecessary to build your own charger this way. I recommend that you hook up a ready made switching power supply with a lithium protection circuit (for battery banks) with charging funneled through a thermostat. The voltage of the power supply would be 4.2 multipled by the number of batteries in the bank. The charging current should be about the same as the AH capacity of the battery. PS is $10, protection and thermostat are $3 each. For $16 you could construct a charger that is worth $85 or more in the market. If anyone needs help implementing this idea do let me know. If I get enough requests, I will post detailed instructions.
I have never seen someone write 1V = 1A so let me be more explicit...what ****snail means that if a 1 ohm resistor has 1V across it, it is letting 1A through it.
The age is of modular technology so unless you are an electronic hobbyist this project not for you. Even if you need a cheap / safe functional charger, this project is not for you especially if you do not have a pre-existing power supply of the right voltage. I am also not a big fan of making my own PCBs and usually get away using the general purpose ones when absolutely necessary. The only time I have made PCBs is when I am mass producing electronics. My quick suggestion would be therefore to buy a 2A switching supply ($8), a lithium protection module ($2) and a thermostat ($2) on ebay. You will then merely need to sequence them one after the other and bingo!... you just made myself an intelligent ultra fast charger that costs $75 in the market. Some of these circuits on eBay have fancy LCD display (of course at an extra cost) that will display the progress of charging. So go ahead and knock yourself out... P.S.: I am willing to post details if there are enough requests.
When I do my calculations, your design seems to be outright dangerous to me. When the lithium battery is full discharged, it has a voltage is about 3.4-3.5 volts. With a 1 ohm current limiter, you will allow at least 4A current (since you are recommending a 12V power supply) to flow into the battery. For batteries that have a capacity lower then 1AH, this current will cause an explosion!!
I'm not getting any extra current draw when adding the battery in and I set the open circuit voltage drop to 4.1 V. Any ideas?
i tried this. but in my case i can't change the voltage using that trimmer.why is that..? HELP ME
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