Simplest LED Brightness Controller

The simplest LED dimmer control scheme presented in this article can be successfully applied in car tuning, and just to increase the comfort in the car at night, for example, to illuminate the instrument panel, glove compartments, and so on. To assemble this product, you do not need technical knowledge, it is enough just to be attentive and careful. A voltage of 12 volts is considered completely safe for people. If you use LED tape in your work, then we can assume that you will not suffer from a fire, because the tape is practically not heated and cannot catch fire from overheating. But care is needed in order to prevent a short circuit in a mounted device and as a result of a fire, which means to preserve its property. that it will be installed on a radiator of cooling of the corresponding area. The work of the T1 transistor can be compared to the work of an ordinary water tap, and the potentiometer R1 - with its handle. The more you unscrew - the more water flows. So it is here. The more you unscrew the potentiometer, the more current flows. Twisting - less current flows and less light on the LEDs.

Controller layout

The simplest LED brightness control
For this scheme, we need not numerous details. T1 transistor. You can apply KT819 with any letter. CT729. 2N5490. 2N6129. 2N6288. 2SD1761. BD293. BD663. BD705. BD709. BD953. These transistors need to be chosen depending on the power of the LEDs you plan to adjust. Depending on the power of the transistor is its price. Potentiometer R1 can be any type of resistance from three to twenty kilos. A three kilo-ohm potentiometer will only slightly reduce the brightness of the LEDs. Ten kilo will reduce to almost zero. Twenty - will adjust from the middle of the scale. Choose what suits you best. If you will use LED tape,then you will not have to bother with the calculation of the damping resistance (in the R2 and R3 scheme) using the formulas, because these resistances are already embedded in the ribbon during manufacture and all you need is to connect it to a voltage of 12 volts. Only it is necessary to buy a tape on voltage of 12 volts. If you connect the tape, then remove the R2 and R3 resistances. Also produce LED assemblies designed for 12 volt power supply, and LED bulbs for cars. In all of these devices, in the manufacture of manufacturing, damping resistors or power drivers are built in and directly connected to the on-board network of the machine. If you are only taking the first steps in electronics, then it is better to use just such devices. So, with the circuit components we decided, it's time to start assembling.
The simplest LED brightness regulator
Screw the transistor to the cooling radiator through a heat-conducting insulating gasket (so that there is no electrical contact of the radiator with the vehicle electrical system, in order to avoid a short circuit).

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