Testing 2n3055 transistor full#
Testing 2n3055 transistor series#

This IC is easy to use and requires only two resistors to provide the variable supply. This regulator provides output voltage ranging from 1.2V to 37V at 1.5 amps.

Testing 2n3055 transistor series#

LM317 is the 3 pin series adjustable voltage regulator. If you use a 100 ohm/1 watt potentiometer then the output current is limited 3 Amps at 47 ohms and 1 Amp at 100 ohm. Pot RV2 is used to set the maximum current available at the output. Here 2N3055 transistors are used to get more current. In order to get 0V at the output we are using 3 diodes D7, D8 and D9.

The minimum output voltage of LM317 voltage regulator 1.2V.

Pot RV1 allows us to vary the output voltage in between 0 to 28V. So we need to use all the capacitors which are rated at 50v in the circuit. The rectified voltage at capacitor C1 is around 42.30V (30 volt *SQR2 = 30v *1.41 =42.30).

Testing 2n3055 transistor full#

Huge heat sink is required in this circuit, as 2N3055 transistors produce large amount ofВ heat at full load.ДЄlthough the voltage regulator LM317 protects the circuit from overheating and overload the Fuses F1 and F2 are used to protect the power supply circuit. This design canВ produce a current of 20 amps with little modification (use proper rating transformer and a huge heat sink with fan). 0-28V, 6-8A Power Supply Circuit Diagram using LM317 and 2N3055 In order to increase the upto 30v input of 30v should be applied. The above circuit uses only 15 v transformer at the input,so it can be varied maximum upto 15V. It is important to attach the voltage regulator IC LM317 to a heat sink as it tends to get hotter during operation. This circuit can be used as reliable DC source and acts as a replacement to batteries. With the help of this variable DC power supply, the output voltage can be varied from 1.2V to 30V at a current of 1A. 10Kв„¦ POT is used for large change in voltage while 1Kв„¦ POT is used for fine adjustments.Дepending on the settings of the POT, the ADJ pin of LM317 receives a small portion of the output voltage as feedback and the output voltage is varied.ДЄ capacitor is used at the output of the voltage regulator so that the output voltage doesnвЂ™t have any spikes. In order to vary the output voltage, two variable resistors of values 1Kв„¦ and 10Kв„¦ are used.

This pulsating DC is filtered using the capacitor to get a clean DC and is given to LM317 which is a variable voltage regulator IC. A bridge rectifier is used to convert this voltage to DC. The working of the circuit is as follows.ДЄ transformer is used to step down the AC supply to 24V at 2A. It is a robust, reliable and easy to use variable DC power supply. Instead of using batteries, which have a limited lifetime, a variable DC power supply can be used which is implemented in this project. For smaller voltages, we normally use batteries as a reliable source. This voltage should increase as you continue to increase the supply past 1.8 Volts.A Variable DC Power Supply is very important for electronics projects, prototyping and hobbyists. As this happens, current is driven through the collector resistor, so a voltage should appear across this resistor. As the voltage supply approaches 1.8 Volts, the transistor should start to turn on. The base-emitter voltage of the 2N3055 is about 1.8 Volts. Gradually increase the voltage supply that is connected to the base resistor, and watch the reading on the voltmeter. The voltage should be zero volts, because with no base voltage, the transistor is turned off, so no current is passing through the resistor. Touch the probes of the voltmeter to the leads of the collector resistor. Set the collector voltage supply to 10 Volts and the base supply to 0 Volts. Insert a wire that connects the emitter of the transistor to the ground rail.

Connect the negative terminals of the supply voltages to one of the long 'bus' strips on the breadboard (these usually run horizontally at the top and bottom of the breadboard).

Connect one positive supply voltage to the unconnected lead of the base resistor, and connect the other positive supply voltage to the unconnected lead of the collector resistor.