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Well you have to use a sense resistor which is just a resistor with a small value to detect current.I would rather use the other circuit that uses a transistor. Just Google simple diy led driver. It's on instructables too! Look at that one!
https://www.google.com/amp/www.instructables.com/id/Super-simple-high-power-LED-driver/%3Famp_page%3DtrueThis is a bit better and has a good explanation! I think you'll understand how this works afterwards too. ^_^
Yeah. I actually tried it on a breadboard ^_^ it does work if you replace the Resistor with your LED (or whatever you want to power with a constant current).not sure though, because I didn't have a logic level mosfet and used 12v for the op amp!the load+ mosfet works as a voltage divider afaik!
I don't see why not! just replace the resisto with your led! but I have to remind you I'm a noobie just like you c:
It has to be logic level. the Lm358 only outputs 5v. the datasheets says it allows 10A at 5v so I guess you're ok! Not sure though
Lol I doubt it :D
that's more expensive. not everyone has money c: and it does the same thing and it lacks the awesome usb ports c:
Ps my op amp in the LTC3780 gets very very hot. and my Current is very off. my voltage is pretty accurate though. anyone has any ideas ;c?
You only live once xD I doubt anything's gonna happen! I don't have a printer or wood or metal or anything. Specially patience :)
Doesn't the water get in :c?
How do you upload the code to it :c?
I have one which outputs stuff correctly. but the OP amp gets TOASTY! I used a tiny heatsink on the op amp (lm358).can anyone tell me if their's do that too? because litteraly the second Ibought it I accidentally smashed the circuit with my screw driver while adjusting those annoying pots :Dsadly the second one I bought had the same thing happen to it. only this time it made a giant spark on constant and now it gives me a constant 2.3v and the ltc3780 heats up very quickly
20$?! I bought a step down with current limiting for like 1$ it has no problems with 1a (I have a 10W LED)!
can't a thief just connect the lock to power?!and what on earth are you supposed to do if you run out of power while outside :D?
I would suggest buying a switching current limiter, you're paying that much pay a few more dollars (2$?! I found mine for around 2-3$) and mine didn't generate even the tiniest amount of heat while charging at 2A! (mine is 50F! charges my phone for 2 minutes :c)
oh, that's sad :cbut if I wanted to do something that is battery operated and don't want to waste energy or generate heat. what other options to I have? As far as I've found out my other option for current limiting is switching which I have a hard time understanding!
Awesome! Can I ask a unrelated Question?The Op-amp circuit you used in your charger, does it waste the unused current as heat like most other cheap limiters?the reason I'm asking this is because I need a current limited Constant voltage circuit (Charging a phone from a super capacitor) what can I do?
I don't understand. What's the difference between this and putting the potentiometer in place of the mosfet? Wouldn't the current go higher/lower if the led (power led for example) heated up?
Thanks a lot :) This sounds pretty good and reasonable for LEDs. I wonder why They sell the expensive controllers :? you can't change the voltage with them too. you can't control them with a mcu :S
Hah! Awesome xD but buying it is easier
If you have the money or if you Can use a 24inch phone you can make one :)
Don't resistors only limit current? And doesnt the - on the comparators change as battety voltage drops?Anyway to get more accurate readings to my arduino? I want to be able to tell percantage
Wouldn't it be annoying if you're in a cae and the sun keeps blocking it? A capacitor is not big enough and battery makes things complicated!aybe i could use 4 bulky ones :D in parallel
Doesnt the 3d printed part leak? I was thinking of doing thr same to my square bigger heatsink to turn it into a water block for my peltier!!
Does this eve cool the room for a single degree ?:DI currently use a bucket of ice, a hole in mid, fan to push air in in top ice in middlewater drops to the bottom. The air is 11 degrees but it's so small, Instead of a 80mm fan I might add a case fan but I'm too lazy to go buy a fan :D
I will take this to the paintball next time :) Just sit back in the cover and watch them scream!
I should make one in my room, but somehow it hsould now me, this way my brother won't get into my room again!
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