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lm2623 solar
I know this has been asked before.. but I never saw schematics or a follow up as to how it came out on some of the projects. So I was wondering how to go about making a solar panel battery charger for say a parallel of four 3.6-3.7 volt lithium ions. I know some say a...
Ok.. I got both the MAX1674 and LM2623, boy are they tiny.. I'm not even sure I'd be able to put them in a circuitboard...do I need a socket and where would I find one for such a little surface mount, any advice on this? Also.. I may need some help with the LM2623 and the capacitators and all I...
What about something like this **broken link removed**
that uses pulsed current for battery life? EDIT: Oh Wait, I do see where this is just used to control an external NPN transistor...it lost me after that
Or something else with a PWM.. or maybe like 4 or 3 ZXSC410/420's would be best.. with...
Ok.. that makes sense.. I thought they had a 1000ma badboy though now. I'm just curious as to battery effeciency with such a device and if it would be feasible to use say 2 1.2v NiMH to run them... Again, if there is a way to do this and build it myself, I will. I like the idea you had off the...
lm3578 leds
Ok, so if anyone had read my post about needing a buck or DC-DC converter to power some 20-40ma 3.6v LED's:
then they know my dilema... however, I figured I may be going about it all wrong and actually want to use a boost converter. The ones I've seen are the Badboy and the...
Ok, Thanks. Again, that circuit doesn't look too bad but I may need some help figuring out what ohm resistors/capacitators/whatever I would need to get it down to 3.8v's. I've tried to use Nationals workbench thingy but it does it for AC and sometimes it doesn't work. The LM2575T-ADJ says it...
Ok well I ordered 2 samples.. may I PM you if I need any help when they arrive? I appreciate the help you have given thus far. One question though.. the T package says it can only support 8 - 40v? Is that right, do I need another package to use say 6 or 7.2v?
Thanks.
Ok thank you very much. I would need to keep the output voltage higher than 3.6 though to be able to use resistors to get the correct current for the LED's correct? And when you say the rest of the circuit stays the same, you mean keep the capacitators also and just basically substitute the...
lm2575 constant current regulator
Hello all, I'm VERY green to electronics, but after reading some information on small circuits, I'm trying to design one that will power 20-30 3.6v 20ma LED's for around 9-12 hours. I'm orgininally was thinking about using 7.2v batteries with a LM137 circuit...
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