This circuit exploits the fact that transistors can function as current amplifiers in circuits. However, if you wanted to drive 2 LEDs in parallel, you would need a driver circuit to get more current. Thus, you could drive a single LED on an output pin. A chip such as the Atmega168 or Atmega328 allows for about a maximum of 20mA of current output Or you may have a chip that allows for enough current to light an LED but you may want to light several LEDs in parallel.įor each LED that you want to light in parallel, about 15mA of current are needed more per LED. This current may not be enough to drive an LED. However, say you have a circuit that is operating off the power supplied by a chip and the chip can only output a There will be enough powerįrom that power source to light up the LED without the need for a transistor. Of course, if you're powering an LED and you can connect the LED directly to a power source, you won't need a very sophisticated driver circuit. The point of this circuit is to demonstrate that if you do not have sufficient current powerful enough to drive an LED, you can connect a transistor to the circuitĮnough current amplification to drive it. We will simply use a transistor and a few resistors to bring about a circuit which, with minimal current, can produce enough current to drive and light an LED.
#2n2222 transistor three color led flasher how to#
In this project, we will show how to build a simple LED driver circuit.Ī LED driver circuit is a circuit which can power on and light an LED>
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