DON'T make an LED flashlight like this

Рет қаралды 5,283

Күн бұрын

I found a video supposedly showing how to make a bright LED flashlight, but it was full of things you shouldn't do. Since it has somehow gotten over 4M views, I decided to explain what should have been done better in that video. I also show an alternative circuit for a powerful LED flashlight using an LED driver.
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Пікірлер: 32

@camforman 3 ай бұрын

Great video. Im an electrical engineer and regularly see these things in commercial products. Leds are regularly connected in parallel with no balasting resistor and connected to a voltage source. While it does work but not for long and rejected peices because the LEDs came from mixed lots must really hurt their yeild.

@TheUnknownCatWarrior 3 ай бұрын

Some bottlenecks: 1. The LED needs more heatsink. 2. You should use a switch mode regulator instead of an analog regulator.

@MrHerhor67 3 ай бұрын

Yeah, SMPS with CV and CC modes. Or maybe even power limit, but that's more difficult to implement.

@edic2619 2 ай бұрын

Great video. Very easy to understand. Thanks.

@goury 3 ай бұрын

I sincerely thank you for this educational material. It was very useful and educative.

@glowytheglowbug Ай бұрын

a single resistor also helps to stop drawing max current (since its a diode not a bulb it draws as much current as it can)

@HammadAMansoori 2 ай бұрын

This is the information I was searching for a long time. Thanks brother👍

@chiwel 3 ай бұрын

thanks god, for this person made this video, i just bought some broken led for a dollar, so i want to change it, but what i know some video doesn't check how broke led without proper module. And I want to ask something what module for; strip cob led 5w(4 piece) with 3 battery? I use brand new laptop cells because I have. And thanks 🙏 for the answer.

@albertogregory9678 2 ай бұрын

Depends on the COB led forward voltage

@ManuKumar-yr4jw 2 ай бұрын

LeftyMarker in the another video you shown in this video has leds connected in parallel so they will waste a ton of amps and power so the first led will share the amps and power to the second one and it repeats like that so there will not be high amount of power and amps to burn down the led and 8 of them in parallel will form 8watt so there won't be enough power and amps to burn down the leds

@Sentinel-1 2 ай бұрын

02:43 One small correction: the current is limited by the total resistance of the wiring and the internal resistance of the battery. In the case of dividing the current into 8 high-power LEDs, this may be enough to limit the current to an acceptable level (although this is still a mistake from a circuit design and engineering point of view).

@Sentinel-1 2 ай бұрын

Oh, nevermind. You've mentioned it later @ 04:30. 👍🏻

@X4R2 3 ай бұрын

Great video, thank you! I got a high power LED a while ago, and now I have a project to try it in! I'm curious, I've heard the light intensity of LEDs is usually modulated by flashing them at a high frequency (like PWM?) since they don't function below a certain voltage. How dim can the LED get with current limiting?

@LeftyMaker 3 ай бұрын

Yes, you can use PWM to control the brightness of the LED. The datasheet for the chip in the driver says it supports it by feeding the PWM signal into the enable pin. They can get very dim with current limiting too, but the brightness is more difficult to control.

@sshutupurface8345 Ай бұрын

Im using a LM2596 off temu its set at 3.1v and no resistor I run 3 x 3w LED's in paralell 3.1v x 0.7A = 2.17W per led total 2.1A medium heat with heat sink

@kamui30 2 ай бұрын

Can we set this up with multiple configuration like low mid max output for the light?

@Jan-iq8ep 3 ай бұрын

Dobrý den, zda se mi to nebo podle vašeho přízvuku jste Čech? :)

@alexvas603 3 ай бұрын

could you please check CE disabled driver current? in specs CN5711 1 milliAmp. to much for emty battery...

@LeftyMaker 3 ай бұрын

yeah, I got 3.2 microamps. Maybe you mistook uA for mA?

@acche-rc 3 ай бұрын

What's a pull down resistor?

@TheSimoc 3 ай бұрын

It is a resistor that pulls the voltage down to ground potential on that pin when the switch is open. Otherwise, if left floating, the high-impedance sensitive enable input could get randomly activated by induced, leaking etc. voltages.

@LeftyMaker 3 ай бұрын

Yup. Without it, the LED may (and did, in my case) start flickering when it's supposed to be off. The opposite is a pull-up resistor.

@Sylvan_dB 3 ай бұрын

To add a bit to the prior answers, sometimes the power and ground connections are referred to as "rails." There is always a higher voltage rail and a lower voltage rail, even if that lower voltage is the common or reference rail. In a simple circuit like this, the higher rail is the battery positive and the lower rail is the battery negative. (More complex circuits can have multiple rails at different voltages.) A "pull down" resistor connects between a point and a lower rail, pulling that point down toward the lower rail. A "pull up" resistor connects between a point and a higher rail, pulling that point up toward the higher rail. If you connect equal value pull down and pull up resistors to the same point, that point will be centered at a voltage mid-way between the two rails. If one of the resistors has a lower value, it will "pull harder" toward that rail and the voltage of the point will be closer to that rail. The voltage of the point can be calculated using ohms law (amps = volts / ohms) multiple times with the total resistance to find the current, and individual resistance values to find the voltages across each resistor.

@Kaloyan-trains 3 ай бұрын

Супер, но този LED Driver има ли го някъде в България?

@LeftyMaker 3 ай бұрын

Не го виждам в Елимекс и др. Може би не

@user-mz1uh4ju1n 2 күн бұрын

Can I input a PWM signal on the enable pin of the led driver? Pls help

@LeftyMaker 2 күн бұрын

Yes, according to its specs

@user-mz1uh4ju1n 2 күн бұрын

@@LeftyMaker ok, thank you

@yanipro3978 3 ай бұрын

Супер си брат

@bertram-raven Ай бұрын

Doing it the right way = 4600 views. Total Nonsense = 4,000,000 views. Welcome to the internet.

@ardawanx Ай бұрын

nice, but the original video showed multiple LEDs while you demonstrated a single LED.

@LeftyMaker Ай бұрын

For multiple LEDs you can use multiple drivers in parallel. With a higher supply voltage you can run LEDs in series, but not with this driver. I will soon make a video about a different driver that can run long strings of LEDs