Adjustable Voltage, Current Power Supply Circuit using Transistor 2N3055

This Adjustable Voltage, Current Power Supply Circuit using Transistor 2N3055 talks about how to make simple and useful power circuit, as this circuit can change voltage and current so it can work for many electronic projects.

Also, the circuit uses one popular transistor called 2N3055 and some other parts.

WARNING: Be careful, High voltage can be very dangerous, do this only with adult help or someone who know electricity.

What is a Adjustable Voltage, Current Power Supply Circuit:

An electric circuit that provides adjustable voltage and also controls the current to the load is called an adjustable voltage and current power supply.

Moreover, in electronics lab, testing place and workshop people use this type power supply when they need different voltage for testing or for research.

Circuit Working:

Parts List:

Components	Values	Quantity
Resistors	1k 5 watt, 120Ω 1/4 watt, 56Ω 1/4 watt, 2.2k 1/4 watt, R4 0.233Ω 3 watt	1 eacj
	330Ω 1/4 watt	2
	Potentiometer 1k	2
Capacitors	Electrolytic 1000µF 100V	2
Semiconductors	Transistors 2N3055	1
	BC547	2
	Diode 1N4007	1
	Diode 6A4	4
	Transformer 0-60V 3 Amp	1

To begin with, this article show one circuit for power supply station with both voltage and current control.

Furthermore, we can change voltage all time and also change current which also stops overload so its safe.

Here, if we look close this power supply circuit using transistor 2N3055 work same like normal power circuit, but it give extra function which is good.

By using preset P2 with parts D1, R7, T2 and again P2 in feedback we can change voltage and D1 ensures voltage goes low which is almost 0.6V because diode drops voltage.

Also, if we need some minimum voltage use Zener diode instead of normal diode.

So this power circuit with 2N3055 transistor and 0 to 40V transformer can give voltage from 0.6V up to 40V which is very useful.

Mostly, T3, P1, R5 and R4 control the current, and R4 mainly decides the output current.

Here, we can change P1 to get many current values based on R4 and if we do not understand or have questions about this circuit with 2N3055 transistor please ask in comment box below.

How to Build:

To build a Adjustable Voltage, Current Power Supply Circuit Using Transistor 2N3055 follow the below steps for connections:

Rectifier and Transformer:

• First connect transformer primary side to main AC power and then connect secondary side to bridge rectifier to change AC into DC.

Voltage Control for Stabilization Circuit:

• After that, connect T2 emitter to place where R7 and P2 meet.
• Then T2 collector goes to positive power and T2 base connects to middle leg wiper of P2.
• Now put diode D1 and P2 in parallel with D1 cathode which is going to T2 base.
• Next, connect R7 between T2 base and collector.

Adjustable Voltage Output:

• Connect base of 2N3055 to output from stabilization circuit, connect 2N3055 emitter to negative power side and load the device connects to 2N3055 collector.

Current Control:

• After that put P1, R4 and R5 in one line in series and connect this to T3 collector.
• Also, join T3 base to point where R4 and R5 meet.
• Then connect 2N3055 emitter and T3 emitter together and also P1 wiper middle leg goes to T3 base.

Connecting Load:

• Here, connect the load between 2N3055 collector and positive power line.

Heat Sink:

• Also, connect good heat sink to 2N3055 to keep it cool when working.

Power Up Slowly:

• Finally, use multimeter to check voltage and current and slowly turn up power to test circuit.

Conclusion:

To conclude, for Adjustable Voltage Current Power Supply Circuit using Transistor 2N3055 always check wiring with circuit diagram and read datasheet of all parts.

Lastly, also be careful with all parts and avoid short circuits and if not sure how to build circuit better ask for help from someone who knows.

References:

2N3055 Power Supply