Due to this biasing current, 2N3904 goes to the saturation state and the LED turns ON. When the switch is closed, the base of the transistor is biased, and current flows to the base of the transistor. Due to this, 2N3904 remains in the cut-off state and the LED does not glow. And no current flows to the base of the transistor. When the switch is open, the base of the transistor is not biased. C B E E B C C Description This device is designed as a general-purpose amplifier and switch. The required resistor value can be easily calculated using Ohm’s law. Abstract: tr 2n3904 2N3904 pin diagram 2N3904 2N3904 transistor data sheet free download data sheet transistor 2n3904 2N3904 equivalent tr 3904 h 2n3904. Proper biasing of the base ensures adequate base current to turn ON the transistor.Ī resistor of 220 Ohm is connected between the load(LED) and the collector terminal to protect the LED from overcurrent. A 2N2222, 2N3904 or BC548 as the final amplifier is a sure sign that the rig. The base of the transistor is biased using a 10 K Ohm resistor(R3) in parallel to the 1 K Ohm resistor(R2) plus base-emitter junction resistance(in series). S8050 Datasheet : TRANSISTOR (NPN), S8050 PDF Download SHENZHEN YONGERJIA. The complete circuit is powered via a 5 V supply. In the circuit diagram given above, 2N3904 is used as a switch to turn ON/OFF an LED connected at the collector terminal.

Free download 2n3904 pinout