add this electronic circuit to your multimeter and get an amazing option

Hello Geniuses in this video i'm gonna show you how you can test the zener diode , and lcd - tv led backlight using old bulb
Led Tv Back Light Tester Led Tester Tool Tv Led Backlight Tester , You Can Make At Home its very Simple

Hope you enjoy this Simple innovation

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🔥 WARNING!
If you copy anything you see in these videos, you do so entirely at your own risk and thank you .

#Backlight_Tester
#mextraf
#inventions

[larylary]

It is a miracle that the inventor is still alive !!! 🧐 🤪 😇

[gonzalomeabe]

THIS VIDEO IS DANGEROUS. DON'T DO THIS AT HOME.
You SHOULD warn about the risk of working with high voltage. You're using a non isolated power supply, and messing around with it without any safety precaution. The only reason you're not getting shocked when touching the leads, is because of the 39 kOhm resistor, but it doesn't guarantee you any safety at all. Any begginer that's willing to learn and comes across this kind of video, could get seriously hurt. You should be more responsible and warn about the risks of this project, and specify that only instructed people can carry it out.

[featheredskeptic]

Keep in mind that these LED lamp drivers are not galvanically isolated. It's just a rectifier with a switch mode DC to DC constant current regulator. You can get an electric shock out of that because all that stands between you and the live wire could be just a diode (depending on how you connect this to the mains).

[giwiijeck]

Никогда не повторяйте это дома. Драйвер от LED лампы не имеет гальванической развязки от розетки. И провода за которые этот чудик так энергично хватается руками, находятся под напряжением.

[Anatoli-y]

Тем кто захотел повторить это: На данной схеме нет гальванической развязки. Это потенциально опасно для жизни! Как вариант, использовать с трансформатором 220-220.

[acmefixer]

Besides being a shock hazard, this 'tester' puts an excessive voltage on anything it is used on. They showed a test of a LED, and it lit up. But if it was connected in the opposite polarity, the voltage would be much more than the LED's reverse breakdown voltage, and would damage the LED. The DMM he used has a continuity range for testing with only a few volts maximum, which is safe for most parts. But this tester has too high voltage and is *not* safe! It could also be a fire and safety hazard.

[Manu-nryt]

That's why missing downvote count is an issue... Don't do this at home. Especially not in countries with 230V mains voltage. No proper isolation!

[vovchjkvovchik]

Лайк заслуженный. Вещь нужная. Продолжай в том же духе. Удачи тебе и творческих успехов!!!

[Athanasius_Kircher]

Отличный реквизит для потенциального лауреата премии Дарвина.

[mahmoodmirza]

Thanks a lot dear!
Exactly this tester has been badly needed by me.

[juntendo]

Just use the diode tester that comes with an multimeter. Decent multimeter will have atleast 3V for testing which is enough to light up most LEDs. For series LEDs, just measure one and multiply with how many in series. Not worth risking ur life for with this stupid non-isolated garbage

[timmytard]

the circuit seems silly, but you're my hero for showing me that a UK plug fits my multimeter probe jacks :D

[tookitogo]

This is lunacy. People, don't build this. An LED lamp is a very unreliable source for a constant-current driver (because different lamps are built very differently), and it's entirely possible for the lamp you choose to be completely unsafe to touch.

[serg-III]

ЖИРНЫЙ ПЛЮС! Автор красавец. 👍
Удобный и необходимый гаджет в хозяйстве. Рассказал и показал так, что любая домохозяйка, умеющая держать в руках паяльник, сделает.
РЕСПЕКТ!👍👍👍

[herbaden]

Man, why not doing it the other way round?? Wire it so that you plug the wall wart into the socket and have some 4mm banana jacks into the multimeter?
Would be at least a little safer by avoiding that someone puts it into a socket.
But overall it's quite dangerous anyway as some posters here pointed out already.

[qpubbtz]

Интересная приспособа. Главное, что бы при неизвестной полярности она не прошивала детали обратным напряжением.

[Kuiperbelt-]

Нет гальванической развязки.Не все как я могут держать руками фазу 380.

[Sentinel-]

It's a typical buck converter in current mode. Instead of connecting load via high power resistor, you should have limited the current using controller's current sense pin and replacing the current shunt resistor with a higher value one.

Also there is a much safer option: MT3608 module + flyback transformer (from cheap USB charger). This can be powered from double AAs or one 18650.

[ocayaro]

The design variability in loading devices makes this extremely dangerous, never mind that the short-circuit output current is around 5 mA. Unbelievable that the video does not post any warnings.

[hereiam]

Pro tip 1: don't do this.
Pro tip 2: DON'T DO THIS!!
Pro tip 3: If you have to do this, use two 40k resistors, one each tab. That way you'd have at least 40kohm between you and live wires.