R1 is used to reduce the base overvoltage and R2 is for the protection of LED. As we apply the base voltage by closing the switch, transistor starts conducting through Collector to Emitter and LED turns ON. In this circuit, we are turning on an LED by giving the supply voltage of 9v. Please consult the most recently issued data sheet before initiating or completing a design. In this circuit the base terminal of the transistor serves as the input, the collector is the output, and the emitter is common. In electronics, a common emitter amplifier is used as a voltage amplifier. 2n3904 datasheet (PDF download) 2N3904 datasheet download. The useful dynamic range extends to 100 mA as a switch and to 100 MHz as an amplifier. In-circuit diagram or schematic which is set circuit in the common emitter. What is the 2N3904 transistor According to 2N3904 datasheet this transistor is a silicon epitaxial planar NPN general purpose amplifier and switch. You can add any DC load in replacement of the LED according to the supply voltage. Schematic of very Simple preamplifiers using 2N3904. Here, the circuit below is the example circuit for the SL100 transistor. Generally available in TO-39 package in the market. It can be used for the various application like switching circuits, amplifying circuits, and manufacturing of the logic gates, etc. SL100 is a general purpose low power transistor.
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