![]() ![]() Transistor buffers are used to interface the circuit to the 12V relays. Text: level by issuing 331, to a low level with 330, and to change state with the sequence 333. ![]() Transistor 3904 is an NPN transistor while 3906 is a PNP transistor as shown below in the figure.2N3904 331 transistor Datasheets Context Search Catalog DatasheetĪbstract: 2n3904 331 smoke alarm using 555 relay 12v 12v relay Solar Charge Controller Circuit 555 3 pin ir receiver module 38khz circuit diagram of remote control door 38kHz Infrared Receiver Module 12v relay drive with microcontroller The basic difference between 2N3904 and 2N3906 is the only type of transistor. It is also used in amplifier up to the frequency of 100MHz.We can also use it in home appliances circuits.It is used in small load switch having low saturation voltage and high gain.The Common emitter type is the popular configuration while using an amplifier the formula of using is given below.ĭC Current Gain = Collector Current (IC) / Base Current (IB) Applications of 2N3904: 2n3904 transistor can amplify power, voltage, and current at different configurations given below. ![]() The transistor acts as an Amplifier when operating in Active Region. The value of VBE should be 5V and the Base current (IB depends on the Collector current. Resistor value can be calculated using the below formulae. Biasing current should maximum of 5mA more than 5mA will damage the Transistor so a resistor is always added in series with the base pin of the transistor. 2N3904 transistor acts as an Open Switch during forwarding Bias and acts as a closed switch during Reverse Bias. When it is used as a switch it is operated in the Saturation and Cut-Off Region. Compliment of 2n3904 Transistors:īC557,BC556, A1015 are the best (PNP) compliment SMD of 2N3904 Transistor
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