There's my 'circuit' as I don't know what kind of values I'm looking for. Just getting my feet wet in electronics, and am looking to make a solar powered do it all charger. So I am thinking, I am going to get some of these http://www.goldmine-elec-products.com/prodinfo.asp?number=G16075 http://www.goldmine-elec-products.com/prodinfo.asp?number=G15684 or those, my maximum voltage I am thinking will be 9VDC, I see no reason to get 12 VDC in it. So for the thinger, It's going to be solar powered, but I am thinking of being able to turn off the solar power and input a 9vdc wall wart power supply as well (night time no sun ya know). I would need to put a diode on both the + for the SP and the + for the wall wart correct? What kind of diode would I need to use, or will any do? As I'm going to be recharging some rechargeable batteries, I think I will use some LiIon AAA batteries, as I'm hopefully going to be putting this in an altoids tin, I think 6 AAA would fit, but 6 AA wouldn't. I am also possibly looking for a combo of phone batteries to get up to 9v, as they are more compact and have more ?life? (that's what i'm thinking anyway) (or do they keep their voltage longer?) What kind of "safety" mechanism could I use to make sure the batteries don't become overcharged and blow up (that'd be bad). I would like to be able to output 9v, 5v, and 3.7v (my cell phone). I was thinking of using a 1/2 circuit board, and put 3 different sets of wires into it (really bad diagram on the schematic), then put different resistors inline with the 3 different sets of wires, and bring them down to the respectable voltages, but I need a switching mechanism, what kind of switch would be good for this type of application - 3 inputs, one desired output? At the end of the wire I will jump them all across so I only need one set going to each of my ports, I was thinking Mini USB, normal USB, and onr for my cell phone. What do you guys think? EDIT:http://www.goldmine-elec-products.com/prodinfo.asp?number=G15853 would that be what kind of switch i'm looking for? EDIT: one more thing, although it's for adifferent top secret project. I have a vibration switch that says it maxes out at 0.1mA, but supposedly a 30mA LED worked, if I were to have 8 LEDs going in a chaser, would I be bogged down to use blues, or could I go all out with reds and greens? http://www.goldmine-elec-products.com/prodinfo.asp?number=G16165 there's the switch. So as I don't really know what factors affect what I'm trying to do, will I be able to drop from a 9v to a 3.7v, and supply different amounts of power? I will just need to put a different resistor inline with the 9v-3.7/5/9v correct? or will there be more to it, depending on how much power is being used and so on?
i think that is quite possibly the worst circuit diagram i've ever seen. perhaps you can get your 1st grade brother to do better? oh boy. i laugh every time i look at your circuit. try looking up voltage regulators to drop your voltage to the voltage needed. i just read the blue leds vs the green/red leds. someone please help this kid before i rip on him for not even attempting to look anything up....
Well theres a constructive response to a first post if ever i saw one, congratulations on making the guy feel welcome. Im not exactly sure what your diagram is trying to show but there are a couple of things to point out. Im not sure ive ever seen LiIon AA batteries or any kind of standardized LiIon battery, the reason for this is that theyre incompatible with normal batteries, a normal AA battery is 1.5v while a LiIon cell is 3.7v (approx). Also, as youve mentioned, you have to be careful charging them or it all goes horribly wrong but you also have to be careful discharging them as they can be killed by over discharging them. Your description of what you want isnt very clear and its pretty obvious that you have very little experience of electronics, in which case i would strongly suggest you do more research and some simpler projects before tackling something like a LiIon charger. Welcome to the forums. Moriquendi
Why would you "rip me a new one" you were knew at circuits once too. The diagram was just supposed to show you guys what I was looking for, I'll admit it didn't do a good job. I don't know what I need in it, and was hoping you could maybe help me out, or at least point me in the right direction with a couple links, but i guess I was wrong. For the red and the blue, i did look it up http://www.lumex.com/images/pdf/SSL-LX5093USBC.pdf http://www.lumex.com/images/pdf/SSL-LX5093HD.pdf Maybe my point wasn't clear, but as blues will have less of a drain, they would indeed be less likely to damage the switch correct? Well sorry for wasting your guys' time, happy moddin'.
Hey, don't listen to any negativity my friend, I once was a newbie, and the learning curve is steep. Not neccessarily. If you ensure the polarity is correct and disconnect the solar cell with a switch before plugging in PSU, it will be fine. You certainly should NOT do this. The least you can do is put normal power diodes in series as each diode drops the voltage by about 0.5-0.7V. Argueably, you would go one step better and use 3 LM317 adjustable regulators. For now, stay clear of lithium based batteries. If you are pondering why, Li-poly batteries are the most eager of all to start a fire internally if you get things wrong. As for your vibration sensor, I would use a buffer. This can consist of a transistor voltage follower, or an OP-AMP voltage follower. There are probably more unanswered questions. Make it easier and post them in a list form?
i apologize, didn't realize it was your first post. sorry for being a jerk, i was way to harsh. back to your question... i'm not exactly sure what your trying to do... different types of batteries require different types of charging circuits. they make some IC's for different type of batteries that will prevent overcharge. i was thinking about using one to charge a lead acid battery. again, i'm sorry, and welcome to the forums
Hey no worries. Alright, I'll scrap the LiIons until later then. Say, What if I were to disassemble an in the wall battery charger? That would have the overcharge circuit for normal rechargeable batteries correct, and although it would only support a max of 4, I could do without the 9v output. http://www.mouser.com/search/ProductDetail.aspx?R=LM317MTvirtualkey51210000virtualkey512-LM317MT Is that the adjustable regulator I'm looking for? Also, although I will wait until I further my electronical knowledge, anyone looking for the necessary elements to protect a LiIon battery http://www.cfht.hawaii.edu/~robotics/club/viewtopic.php?t=101&sid=5205fa2f2c3c666eccd005b41fa88b0c http://www.batteryspace.com/index.asp?PageAction=VIEWPROD&ProdID=2721 That thing will protect the LiIon batteries against all the hazards correct, or should I still wait to learn more? I don't know for sure, but I think this thing would be fairly easy to build with the voltage regulator, and the battery protector, just strap on a solar panel and the sockets and we're ready to go.
what, exactly, are the types of batteries you are trying to charge? just LiIon or LiPoly, etc? as far as the wall battery charger, all you would have to do would be to scrap the ac-dc converter, throw a voltage regulator in there instead, and then hook up the solar panel (at least in theory). if you have an volt meter you can measure the output of the ac-dc conversion, the set your regulator to that level.
Saw this: http://www.dimensionengineering.com/AnyVolt.htm the other day. I don't know much about it (or about electronics) but it's what your post made me think of.
That's a very nice looking little power supply there... Anyone got a schematic for something like that?
looks neat but the 100mv typical, 200mv peak noise on it makes me kinda shudder when I think of what could be happening on a digital logic circuit, or an amplifier circuit, or anything noise sensitve
