As this current increases, the sound of the amplifier gets better, but the end transistors are more heating. This current can be regulated with the 500ohm trimmer resistor. – This is a class B amplifier, this means, that a current must flow through the end transistors, even if there is no signal on the input. – Capacitor C2 regulates the higher frequencies (treble), as the capacitance grows, the higher frequencies are getting quieter. – Capacitor C1 regulates the low frequencies (bass), as the capacitance grows, the low frequencies are getting louder. The and transistors can be any NPN type power transistor, but do not use Darlington types… The output power is around 60W. The 100W audio amplifier circuit diagram operates on the principles of amplification and power handling. Working Principles of the 100W Audio Amplifier Circuit. As you can see, in this design the components have a big tolerance, so you can build it almost of the components, which you find at home. The 2N3055 transistors are popular for their ability to handle high voltages and currents, making them well-suited for high-powered audio applications. The maximal input voltage is around 0.8 – 1V. The optimal supply voltage is around 50V, but this amp work from 30 to 60V. The way of controlling power motor via simple push button realizes the use 2N3055 as a switching device and in the same way we can use 2N3055 in other transistor circuits.The 2N3055 Power Amplifier is simple and low cost. With transistor going to high resistance state in OFF mode, the collector current also becomes zero bringing motor to stop. This motor will keep rotating until there will be base current.Īfter a certain time when the button is released the base current becomes zero and the transistor gets turned OFF. Having transistor acting as short circuit in ON state there will be collector current which flows through motor making it rotate. With this closed loop a current flows through base of transistor and with base current flow the transistor gets turned ON. When the button is pressed at certain time, the voltage V2 forms a closed loop with base-emitter of transistor as can be seen in circuit diagram. With no base current the transistor acts as open circuit and the entire supply voltage V1 will appears across it. Under initial conditions the button will be open and no current flows through the base of transistor. Complementary silicon power transistors are designed for generalpurpose switching and amplifier applications. The 100Ω resistor is provided for limiting the current through base. The trigger source and power source must share a common ground for the circuit to work. Here we are going to use 2N3055 as a simple switching device to drive a motor and is in common emitter configuration.Īs show in circuit we are using a motor as the load and the gate signal for turning ON the transistor is provided by 5V source with button being the triggering device. The device has good amplifying factor and also the gain is almost linear making 2N3055 one of best solution for power amplifiers.Īs mentioned earlier the 2N3055 can be used for any NPN transistor applications but for understanding the functioning of device let us consider a simple application circuit as shown below. It is a current-controlled device where a small amount of current at the base terminal is mainly used to control a huge current at the remaining two terminals like emitter & collector. 2N3055 is one of the basic transistors available in the market for cheap and with features being suited for many applications.ĢN3055 is also used in audio power amplifiers. The 2n3055 is an NPN transistor functions like a normal transistor that includes three terminals such as emitter, base, and collector. Operating temperature range: -65✬ to +200✬ĢN6673, 2N6675, complementary pair- MJ2955ĢN3055 is preferred when you want a simple switching device for medium power loads.Maximum voltage across collector and base: 100V DC.Maximum current allowed through base: 7A DC In this project, we will design a Simple 3A 12V power supply circuit using a 2N3055 power Transistor.Maximum voltage across base and emitter: 7V DC.Maximum current allowed trough collector: 15A DC.Maximum voltage across collector and emitter: 60V DC.Low collector-emitter saturation voltage.Normally used as trigger to turn ON the transistor The pin configuration of 2N3055 is given below. Like any other transistor 2N3055 has three pins namely EMITTER, BASE and COLLECTOR. The device is designed for general purpose switching and amplifier applications. 2N3055 is a general purpose NPN power transistor manufactured with the epitaxial base process, mounted in a hermetically sealed metal case.
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