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!
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.👋🏻🌹
One more question my friend, if I use RC driver available in the market, is it shock proof? You never showed, how to find out Zener diode value. Please reply.
My friend, it is better to use the same 1n4444 diode, it does not cause any danger, and you can also use the RC driver, and this video is just a cheap idea.
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.
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
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
@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
@@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.
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!
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.👋🏻🌹
What will happen if I use 20k ohms instead of 10k ohms
Hello, dear friend, it is recommended to use 100k. it is better
One more question my friend, if I use RC driver available in the market, is it shock proof? You never showed, how to find out Zener diode value. Please reply.
My friend, it is better to use the same 1n4444 diode, it does not cause any danger, and you can also use the RC driver, and this video is just a cheap idea.
Creative video, thanks :)
We are glad you enjoyed our video..⚘️😊
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.
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
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
@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
@@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.
Kudos to you and your level of alertness
May God protect you👏🏻👏🏻🤜🏻🤛🏻🌹