I want to share with you my example, as I did simple backlight keyboard for your favorite computer. This backlight does not shine in the eyes and has an electronic adjustment of the brightness of the glow. It can be connected both to the power supply unit of the computer itself, and to the bleeding power adapter.This is a common analog controller.Everything is assembled without an add-on board. If you want, you can do everything on the board. Next, glue the transistor to the radiator with special heat-conducting glue or fasten it classically.Checking the assembled circuit in operation. If everything is smoothly regulated, this is good.Install the aluminum profile above the keyboard, on steel wire, and glue in any convenient place. For solidity, steel wire is dressed in black heat shrinkage. With hot glue we glue the regulator to any place you need.
Making the backlight for the keyboardThe brightness control scheme is simple and does not contain scarce details.
What we need
- IRF840 transistor (you can take a bipolar).
- 22K resistor - 2 pcs.
- 240K resistor.
- 100K variable resistor.
- 1-10 microfarad capacitor at 25 V.
- LED strip white glow,approximately 35 cm.
- A piece of thin aluminum profile.
- Steel wire.
Putting the scheme
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