Home Made LED and Diode Tester Auto Voltage / Simple and Useful..

This circuit is one of the simplest and cheapest circuits to test LED, TV backlight, and diode test.
don't forget that there is a risk of electric shock.
when using this circuit, so be careful not to harm yourself and others.
This circuit is just an LED tester, not a driver for🔥 LEDs🔥
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⚡️⛔️DANGER⛔️⚡️
⚠️⚡️Risk of electric shock⚡️⚠️
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[@sploders1019]

THIS IS NOT SAFE! This circuit is just a rectifier with a couple resistors. You can’t simply run a pulsing signal at wall voltage through an led. I’ve fried LEDs and almost started a fire with a fraction of what this circuit runs. Some LEDs may be able to handle it. Most can’t. This circuit is a valid part of an LED power supply, but there are several others missing. Please don’t try this at home!

[@SP_ELECTRON1384]

Hello, dear friend, yes, I agree with you, this device is not safe because I got electricity with this device, but this is the simplest and cheapest idea that I taught you, and I will teach you professional ideas later.👋🏻🌹

[@Bianchi77]

Creative video, thanks :)

[@SP_ELECTRON1384]

We are glad you enjoyed our video..⚘️😊

[@lubomirwinter2628]

It's not a bad idea. Just a current source of about 10 - 20 mA. But...
For safety reasons, it's only usable in an isolated network or through an isolation transformer. If the mains is with phase and zero, it's life-threatening!
It's probably designing for a 115V network. Then there is about 0.66W of power on those resistors, while they are only rated for 0.5W (2x 1/4W). With short term measurements, it can be sustained. However, in a 230V network, that power is about 2.65W and the resistors are more than 5x overloaded. Even with a short measurement, smoke will rise from them and they will break down very quickly.
And one more tricky thing - the allowed closing voltage of the LEDs. If I don't know the correct connection of the LED pins and I test one direction and the other, I will most likely destroy the tested LED in the moment I connect this tester to the diode in the opposite direction.

[@SP_ELECTRON1384]

Hello dear friend, your explanation was very brief and useful
But remember that this idea is cheap and you won't find it anywhere easier
We tested with this LED light device many times but it never got hot
And if two poles are connected, nothing special happens
And it's not very dangerous, electrocution is very mild

[@lubomirwinter2628]

Yes, it's cheap and easy. But is that a greater advantage than endangering human life and possibility of destroying the parts being tested?
You are probably working with an isolated 115V mains (common in the USA for example). Here in Europe we have 230V and phase and zero (zero is grounded and there is always a life-threatening voltage against ground on phase). You have to take into account that your idea can be copied by anyone all over the globe and it is not always as safe as you believe.
I also test boards for LED bulbs, but for that purpose I got a low power DC-DC Boost Converter 8-32V to 45-390V High Voltage at Ali and I have a 300 kohm resistor at the output, current about 1 mA (that's enough, otherwise the LEDs shine too intensely in my eyes). It's safe and cheap (about $4 including shipping).@@SP_ELECTRON1384

[@SP_ELECTRON1384]

@lubomirwinter2628 You have very good information, thank you very much 👏🏻👏🏻
But we live in Iran and the voltage here is 230 volts
And we got a good response from this device in every way
And there is no danger for you dear followers🌹
This device is capable of giving 124 volts DC! And when testing LEDs, its voltage changes

[@lubomirwinter2628]

​@@SP_ELECTRON1384 I work in the industry and therefore have to know the safety standards (and prove this knowledge regularly before a professional committee).
The conductor I can touch has a permitted AC voltage of 25V and a permitted AC current of 3.5 mA (through the human body). This is not the case with your device.
Yes, due to the bridge rectification effect, both output conductors show about 120V to ground. And both are equally dangerous to touch!
Sure, when testing an LED, almost the same current always flows and the voltage is reduced due to the resistors involved. It works on the principle of a current source.

[@SP_ELECTRON1384]

Kudos to you and your level of alertness
May God protect you👏🏻👏🏻🤜🏻🤛🏻🌹