Led Driver Circuit 5v

Here a simple 1 watt led driver circuit based on a modified joule thief design runs on a 1 5v single aa or aaa cell.

Led driver circuit 5v. This led driver uses just few parts still capable of running leds from 150v to 230v but the main point is it s simplicity and low cost. Pwm circuit for 3 3v 5v logic controllers high ampere. This helps avoid thermal runaway as the constant current led driver compensates for the changes in the forward voltage while delivering a constant current to the led. This circuit is pretty efficient and it can power a 1 watt white led quite brightly.

Sir is this circuit suitable for 9 watt and 12 watt as i want to use 9 parallel led of 1 2 watt and want to operate circuit at for 12 volt battery source led spec is 9 10 voff and 120 ma current please tell me what change is exaxtky required and lm 338 required heat sink or suggest any other good ckt for different combination like strings of 4 led 3 volt voff and 3 parallel series of this. Connect to a micro controller pwm or a computer. With a 5m led strip 14 4w m a regulated 12v 10a power supply 120w and lots of microcontrollers arduino uno arduino micro raspberry pi b rev 1 raspberry pi b raspberry pi 2 i m not able to properly control the pwm. Simple led light emitting diode circuit diagram in electronics an led circuit or led driver is an electrical circuit used to power a light emitting diode led.

If your micro controller is 3 3v or less you need to use circuit 4 and set your micro controller s output pin to be open collector which allows the micro to pull down. Here is a transformer less 220v led circuit not very efficient but very simple and quick. It is very dangerous to use 230v ac supply on breadboard. However being a non isolated topology does not provide safety from electric shocks at the led side of the circuit.

In this circuit we will drive an led directly from 230v ac mains supply. The micro controller s output pins are only rated for 5 5v usually that s why the zener diode is important. Running a series circuit helps to provide the same amount of current to each led. The led driver is a self contained power supply which has outputs that are matched to the electrical characteristics of the led s.

Efficient led driving is tricky you ve to take care of both led voltage and current. Another interesting led circuit is the diy led light bulb. I got the concept of this circuit few years back from a led torch which was powered by a single aa battery. In this we designed an led light bulb and used it as a regular bulb.

Things to consider before selecting an led driver. Here is a 23v0v led driver circuit. Now you ve got a fully digital controlled high power led light. Apart from the above drawback the circuit is flawless and is virtually protected from all possible mains surge related dangers.

The requirements of a lighting application often dictate what type of circuit can be used but if given the choice the most efficient way to run high power leds is using a series circuit with a constant current led driver. The circuit must provide sufficient current to light the led at the required brightness but must limit the current to prevent damaging the led.