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DIY LED lamp

LED lamps are increasingly replacing incandescent and CFL lamps or simply “housekeepers”. You can buy them, but it's great to do it yourself.

For the construction we need:
- part of the lamp type "housekeeper", the one with the base;
- LEDs 5630;
- 4 diodes 1n4007;
- electrolytic capacitor from 3.3 uF;
- resistor R1 - 470k, 0.25 watts
- R2 resistor - 150 ohms, 0.25 watts
- resistor R3 - about it later.
- capacitor type K73-17 with a capacity of 0.22 uF and a working voltage of 340 V;

The circuit is simple with a quenching capacitor.
LEDs in the amount of 8 pieces.

Scheme for selecting capacitor capacitance.

Adjustable resistor R3. He set it to maximum resistance before turning it on, so that the arrow of the device does not go off scale. Then he minimized it. Capacitor C2 with a voltage of 340V. During the tests, I set 10 microfarads, but because of the size, he did not fit into the case, set it with a rating less. Why so much stress? This is in case of an open circuit with LEDs. Since the voltage will jump to a voltage higher than the AC network by 1.41 times (230 * 1.41 = 324.3V).
DIY LED lamp

Trying capacitors with different capacities, I got approximate results.

The current can be calculated by the formula:
Where "I" is the current of the LEDs in amperes.

Or according to a simplified formula:

I was guided by measurements carried out on a test circuit with a milliammeter.
The board was made using LUT technology. SMD LEDs
The board in lay 6 version is attached

5630-8sht-36mm-diametr.zip [1.76 Kb] (downloads: 234)


We poison the board, drill holes and trick.

We solder diodes, LEDs, resistor R1, capacitor C2.

The board is mounted in the basement of the case.
The diameter of the housekeeper's case is 38 mm, the board is 36 mm.

Capacitor C1 is soldered by a canopy to resistor R1. Again, due to housing limitations. Resistor R2 is removed from the board and acts as a "brace". Due to its board tightly pressed against the body.

Solder the resistor and wire to the base.

The first inclusion was made through a light bulb. The lamp consumption was 7.45 watts. It is not possible to measure by the luminous flux, but by eye more than 3 watts (when compared with the adjacent purchase).

The circuit has no galvanic isolation from the network. Be careful when experimenting and operating. Also use caution when installing the lamp. Mounting with the circuit breaker open.

The lamp has been working for about a year and a half with constant on / off.

On the video, you can see everything in detail:

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24 commentary
Author
Surprise me.
Quote: popvovka
Want more information, then read an interesting little book.

Do you want to say that Biryukov has a chapter "Mains power supply with a quenching capacitor"? It’s a pity that you didn’t read it, apparently, that's why you brought the wrong formula. ((
Quote: popvovka
I think it’s clear to you, you’re a professional in electronics ...
In short, you do not want to answer. ((
If there is no explanation from you on this formula, we will assume that it is given thoughtlessly, and you do not understand its meaning. ((
Author
Pretty cheap, but I bought cheaper)
Author
I think it’s clear to you, you’re a professional in electronics ...
If it’s not clear, then the formula is simpler.
Well, if here you are also a pass, that is, a table. Although, you are not going to collect anything ...
Want more information, then read an interesting little book.
Biryukov S.A. Chip devices.
Quote: popvovka
Well, let's ban CFL and all the variety of Chinese products without drivers?

To whom eyes and nerves do not mind - use.
Quote: popvovka
About the formula. I asked the eldest daughter, grade 9, she and then it is clear what and where ...
It might be clear to her, but not to me. Once again, I ask: discover the secret, where is the upstream measured? And what is hidden behind the coefficient 3200, what is the physical meaning?
Author
Well, let's ban CFL and all the variety of Chinese products without drivers?
About the formula. I asked the eldest daughter, grade 9, she and then it is clear what and where ...
Author
Thanks for the comment)
The lamp has withstood many power surges and atmospheric changes.
Thanks for the information!
I found it.
Thanks for the information!
Quote: popvovka
The formula is correct, taken from open sources.
The second of the first does not follow. )))
Quote: popvovka
You want to say that a different voltage is needed to power the bridge and it will differ by a lot of percent from the voltage at the load?

I’ll ask again, in a different way, what is Upit? Where is the tension?
Quote: popvovka
Your speculation is not justified. The lamp can be used anywhere, maybe even to a lesser extent in non-residential premises.

This is not speculation, but the truth of life: according to this scheme there will be large pulsations of light. Only for places where a person does not stay for a long time! At your entrance to the house - there it is the place. It is possible in the pantry, in the toilet, but not in the living room.
axivovka,
By the way, here you can order and buy LEDs such as home-made
Only 215 rubles per 100 pieces. Inexpensive and high quality. I advise.
For the whole house (naturally private), the stabilizer, I think, will not be cheap. So, for a long time you have to save. It is easier to protect the most expensive consumers (TV, refrigerator, audio, etc.), for example, with old Soviet stabilizers, which were previously used with TVs. I think it’s not difficult to find them, but they worked very reliably “Soviet-style”, though they buzzed like a tractor, but ... for lack of a maid .... "they have a janitor).
I myself looked at the stabilizer at home, saving up money.
This is not only a problem in your village. At in the Nizhny Novgorod region, in the village, the tension is always too high, but ..., what can you do? Do not put a separate stabilizer on each consumer? So we live in anticipation when something is sure to burn out.
In our village, a spouse always walks, then 180, then 240.
And I really liked the homemade product, and nevermind that the formula is incorrect. Made simple, affordable and high quality. There are, of course, flaws in this scheme. Due to the unstable alternating voltage in our network, this light bulb (LEDs) will be subject to power drops, which is not good, but popvovka Well done.
Tip: If you put a zener diode after the diode bridge for a voltage calculated on the number of LEDs, you can do without a high-voltage capacitor, putting a low-voltage one will be more durable.
Thank you, and where can I buy or order these?
Author
In this design, the current is about 25-30 mA.
Author
The formula is correct, taken from open sources.
You want to say that a different voltage is needed to power the bridge and it will differ by a lot of percent from the voltage at the load?
Your speculation is not justified. The lamp can be used anywhere, maybe even to a lesser extent in non-residential premises. Installed and perfectly serves to illuminate the entrance to the house. The distance to the lamp is about 2.5 meters.
There is enough light to find the keyhole.
And what current does the LED have?
Formula
wrong.
It must be understood that Upit is the voltage at the input of the bridge?

Forgot to write that such a bulb can only be used in non-residential premises.

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