Introduction: Variable Voltage Power Supply Circuit Using IRFZ44N Mosfet
Today I am going to make variable voltage power supply using mosfet IRFZ44N.
In different circuit we require different voltages to operate the circuit.So by using this circuit we can get desire voltages (upto-15V).
Let's get started,
Step 1: Take All Parts
Components required -
(1.) Mosfet - IRFZ44N x1
(2.) Connecting wires.
(3.) Potentiometer - 100K x1 [To adjust the voltage]
(4.) Multimeter [For measuring voltage]
(5.) DC Power Supply - 15V
Step 2: Solder Mosfet
At first we have to solder mosfet into the potentiometer like as picture.
Middle pin of mosfet to the 1st pin of potentiometer and
1st pin of mosfet to the middle pin of potentiometer as shown in picture.
Step 3: Give Power Supply
Next solder power supply wire to the circuit.
+ve wire of Input power supply to the 1st pin of potentiometer and
-ve wire of Input power supply to the 3rd pin of potentiometer as shown in picture.
Step 4: Solder Output Wire
Connect output wire of power supply.
+ve wire of output power supply to the 3rd pin of mosfet and
-ve wire of output power supply to the 3rd pin of potentiometer as shown in the picture.
Step 5: Circuit Is Ready
Now circuit is ready,
Give 15V DC power supply to the circuit and connect digital multimeter in the wire of output power supply and measure its voltage.
Rotate the knobe of potentiometer and measure its voltages.
Voltage will changes according to the rotation of knob of potentiometer.
Question 5 months ago on Introduction
input how much voltage
1 year ago
First off, nothing negative, very simple for me.
I think if the green wire was black (negative) going in from power source to the FET and the other was red, it would be clearer for new people in electronics. Like the person that asked for a circuit (schematic). The last left pictures does show it all pretty much (only no DC power supply).
Also, you did not mention the max. current or heatsink. Just a little more would help the new people in the electronics world.
I enjoyed it, simple. Like LM317, etc. Handy sometimes.
Question 1 year ago on Step 5
I use 10k potentiometer and applied 5v dc it gives output of 0 to 4v dc. Then I use 50k potentiometer and applied 12v 7 ammps it gives out 0 to 9 v dc. Thanks for your help. Tell me how to make 18 led 3.5 v dc circuit. Runs with dc 12v. Thanks
1 year ago
muy bueno el contenido me ha gustado soy tecnico en electrónica y es mi pasion gracias
2 years ago
Your instructables are best. But this is the first post in which I can't find a circuit. I would appreciate it if you add a ckt diagram it helps us a lot to figure out what's happening in short time. It's also one of the reasons that I visit instructables. I hope you consider this next time. Very good website anyway..