2n3906 transistor led driver

If the led has a higher power requirement, then it is best to use an npn transistor as a. A uc pin can easily drive an led at 20ma, but this will require 60ma which is outside. I am trying to use one 2n3906 transistor as a switch. So you see how the transistor allows a circuit to be an led driver. We will use the most widely used pnp transistor for our circuit, the 2n3906. An led driver is an electronic circuit that utilises a transistor to switch power to an led. Switch using 2n 3906 transistor all about circuits forums. The pnp bipolar transistor is designed for use in linear and switching applications.

I have a control signal that vary between 0v and 3,3 vdc at base, but the transitor not open. With the npn transistor in the circuit, amplification is usually to the degree of about 100 to 150. The image below shows a 12v power supply but im actually using a led driver that is 9v and. Pricing and availability on millions of electronic components from digikey electronics. Buy your 2n3906 from an authorized nte electronics distributor.

I found the schematic below and have tried to recreate it with no success. High side transistor switch with 9v led driver electrical. Simple twotransistor circuit lights leds electronicslab. Your personal data will be used to support your experience throughout this website, to manage access to your account, and for other purposes described in our privacy policy. Going from a back view, the first lead is the emitter, the second lead is the base, and the third lead is the collector. It very much similar to the bc557 transistor except for that it has high collector to emitter voltage and hence high voltage loads can be toggled. The device is housed in the to92 package, which is designed for medium p. A brief discussion of transistors ranging from their history, what they are. My load is 7 led flood lights connected in parallel. Lecture on npn 2n3904 and pnp 2n3906 transistor controlled electronics flashing led schematic. Therefore, the current will be amplified by 100, which is 0. Lecture on npn 2n3904 and pnp 2n3906 transistor controlled. The circuit uses a 2n3904 npn transistor and a 2n3906 pnp transistor, which operate as a high gain amplifier.

This is where a pnp transistor differs from a npn transistor. The image below shows a 12v power supply but im actually using a led driver that is 9v and 900ma. Free packages are available maximum ratings rating symbol value unit collector. Bc558 is a pnp transistor hence the collector and emitter will be closed forward biased when the base pin is held at ground and will be opened reverse biased when a signal is provided to base pin. This transistor has only a gain value of 300, hence not suitable for amplifier circuits. The 2n3906 are a good general purpose pnp transistor for low power. Acdc led drivers 53 dcdc led drivers 36 linear led drivers 55. The 2n3906 from multicomp pro is a through hole, pnp low power, silicon planar switching transistors in to92 metal can package. Pnp transistor pinout the pnp transistor, like almost all transistors, is a 3lead device. Usually, the signal from a microcontroller, or logic gate, does not possess sufficient drive current to power an led directly.