![]() When there is little light falling on the LDR (high resistance), the transistor's base is biased, and -ve current flows to the transistor's base. As a result, the 2N3906 remains in the cut-off state, and the LED does not light up. And no current passes to the transistor's base. When the amount of light falling on the LDR is significant (low resistance), the transistor's base is not biased. As a result, the 2N3906 remains cut-off and the LED does not light up. And zero -ve current flows to the transistor's base. The base of the transistor is not biased when the light shining on the LDR is significant (low resistance). Using Ohm's law, the requisite resistor value can be simply computed. To protect the LED from overcurrent, a 5.6 K Ohm resistor is put between the load (LED) and Ground. A 9 V supply is used to power the entire circuit. The 2N3906 is used as a switch in the circuit design above to turn on/off an LED connected at the collector terminal (depending on the surrounding light). Emitter current goes from emitter through the collector to Ground during low light conditions, lighting up the LED as it travels. The 2N3906 is a popular NPN transistor commonly used in these applications:īy turning on the LED linked between the collector and ground, this circuit detects low light. Ĝontinuous Collector current (IC): 200mA.Ĝomplementary of 2N3904/MMBT3904 bipolar transistor.Because of its strong gain and low saturation voltage, the 2N3N06 is widely used.ĢN3906 Features and Technical Specifications When a current of 10 mA flows through the collector, it yields a current gain of 100. It features a 200 mA current rating, a 40 V voltage rating, and a 625 mW power rating. It's made for low electric current and power, as well as medium voltage and a high working speed. The 2N3906 is a common PNP (Positive-negative-Positive) bipolar junction transistor that was first made by Motorola in the mid-1960s for general purpose low-power amplifying and switching applications.
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