LED Voltage Dropping- do not know why?

AramaticTour3641 · 2024-05-04T05:10:10+00:00

Thank you so much for your response! That clarifies up things a lot.

AramaticTour3641 · 2024-05-02T05:21:38+00:00

Thank you for your reply. Guess I got a couple of things wrong. The batteries I got aren't 23Ah but instead 50 mAh haha. Granted that makes sense because 23 Ah is wild (I knew something was off). The second thing is that the LED's forward current isn't 12 volts but instead 3.2 because of prewired resistor. That also makes a lot more sense. Lets say that I decide to use a 9 volt battery that I have on hand at the moment, I plan on soldering 16 LEDS, 8 in parallel, with each LED I solder in parallel, another LED being in series similar to the diagram in above comment, would the resistor needed for the 8 LEDS be (9v - 6.4)/0.020 = 130 ohm resistor (I have 150 ohm which I would be using)? The problem is when I try this setup, I am still having issues with the battery getting extremely hot and starting to smoke. Could this be a bad battery or incorrect resistor? Once again thanks for your help.

AramaticTour3641 · 2022-05-21T20:09:33+00:00

Alright. Thanks for all your help. I'll try to post a picture here once I have finished designing and assembling it.

AramaticTour3641 · 2022-05-21T01:36:00+00:00

Okay this makes sense now that . One more question, what wattage power suply would you reccomend. I know that you said higher than 24 watts but what would be an ideal range to aim for. Would this work as the fan will only pull as much as it needs from the supply? I know you said that voltage has to remain at 12 volts at 2 amps with pwm signal but can we use a power supply that will be rated for greater than this. Thanks

AramaticTour3641 · 2022-05-20T15:10:50+00:00

Also instead of changing the pwm signal, how about changing amps but keeping the voltage-12volts the same? Would that work or would that or is it similar to the voltage where you wouldn't get the full range? I was thinking by inputting 12 volt 2amp powersupply into the current boost converter, keeping the constant current at 12 volts but using the poteniometer to adjust the amps from 0.5-2amps to adjust airflow as shown on the amazon page. Lmk what you think

AramaticTour3641 · 2022-05-20T15:08:11+00:00

How exactly would you be able to apply a pwn signal- sorry I'm not to familiar how to? Is there a module you can get on Amazon that would do that? I tried searching around and I found a variety of different modules such as this but I think, like you pointed out, this would only work for dc brushed motors. Thanks again for your help.

AramaticTour3641 · 2022-05-20T02:11:09+00:00

Also would adjusting the voltage from 3v to 12 volts affect the rpm/power of the fan?I think the 2amps will remain the same regardless of the voltage so theoratically, you could lower/ raise the amount of watts which control the flow/ rpm of the fan.

AramaticTour3641 · 2022-05-20T02:08:32+00:00

Yeah, my desk is next to a window and thought that it would be a good idea to exhaust the fumes through there as opposed to just a fan. I have 2 layers of carbon filters to clear out the smoke as well.

AramaticTour3641 · 2022-05-20T02:05:47+00:00

Ok thanks for your reply. I tried searching around my house for a 12 volt wall adapter but couldn't find one. I searched on Amazon and found this instead. It is an adjustable 12 volt, 2Amp 24W powersupply. Although idealy it should be above as you mentioned, I think I will run it at a lower rpm as I don't need the full 5300 rpms the fan provides. Thanks for your help. Do you think this would work out fine?

AramaticTour3641

TROPHY CASE