Monitor backlight

I made this simple, and most importantly, very necessary lighting with my own hands from a Chinese lamp. After all, you can’t buy eyes, and working on a computer in a dimly lit room is very harmful to the eyes.


This lamp can be bought for 100-200 rubles. It is powered by 3 AA batteries, that is, 4.5 volts.

Naturally I took it apart. The whole circle is in it LEDs was divided into four boards.

I screwed these boards with small screws to the monitor. Two on each side.


I connected both sides in parallel and powered it all from the USB port through a 10 Ohm resistor using a USB cable from an old printer. You can use a resistor to adjust the brightness by changing its resistance in the range from 100 to 1 ohm.

It turned out to be very convenient: I turn on the computer - the backlight turns on, I turn off the computer - the backlight turns off.



Even though the shooting was during the day, believe me: it’s even better at night.

come back
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Comments (14)
  1. NOTFRONT
    #1 NOTFRONT Guests 18 February 2011 20:21
    0
    roll
  2. IvanGovnov
    #2 IvanGovnov Guests February 19, 2011 01:31
    0
    smile
  3. NevaDA
    #3 NevaDA Guests 25 February 2011 15:51
    0
    I have one of these hanging above my desk.
  4. Coule
    #4 Coule Guests 11 December 2011 16:02
    0
    how to contact the author of the post??
  5. NOTFRONT
    #5 NOTFRONT Guests December 11, 2011 16:33
    0
    I'm listening to you cool
  6. Coule
    #6 Coule Guests 11 December 2011 17:23
    0
    I bought exactly the same lamp, there are also 4 strips inside, but the power is from 4 pins (6 volts). I decided to connect it to a 5V power supply via USB. The result is that one plank began to smoke and the diodes burned out. the rest seem to be intact. I didn't mix up the power supply with 12V. clearly supplied 5V. what could be the problem?
  7. NOTFRONT
    #7 NOTFRONT Guests 11 December 2011 17:54
    0
    Everything is fine, it was necessary to turn it on through a resistance of 1-10 Ohms.... This happens...
  8. Coule
    #8 Coule Guests 11 December 2011 18:05
    0
    so there was no overvoltage. on the contrary, 1v was not even enough.
  9. NOTFRONT
    #9 NOTFRONT Guests 11 December 2011 19:14
    0
    Listen to what they tell you! Don't trust the Chinese manufacturer!
  10. Coule
    #10 Coule Guests 11 December 2011 19:44
    0
    Then how much exactly should you set the Ohm?