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12v to 5v converter step down 3A Regulator

This is 12v to 5v converter step down Regulator for my friends. He bought a digital camera that can take pictures and videos as well. But he tells that it has restrictions is available, not long the battery runs out. He did use an external battery, but the size 5 volts not had to modify the battery lead acid 12 volts reduced pressure down to the 5 volts.

OR other cases. If you want the power supply for digital circuit testing or use. It’s like if you have voltage 5 volt 3amp power supply 12V directly from the battery, then it must have a lower voltage to 5V and a current sufficient. I would recommend this circuit. The principle was the simple looking device for sure.

12v to 5v converter circuit

12v to 5v converter step down Regulator

We have 12V to 5V 3A DC converter step down Regulator circuit come to deposit. In sometimes friends have the power supply 12V 3A, but want Voltage 5V 3A for digital Circuit. This circuit can meet the demand of friends get, by it uses normal electronic part and have 7805 integrated circuits perform to control Voltage 5V Regulate alone it gives current get just 1A. then must have an assistant is transistor MJ2955 perform enlarge current tally go up to be 3A besides.

When be born overload or shot circuit as a result still have LED1 bright warn with. And still, make Q2 – BD140 work cause Q3 – MJ2955 stop work with. The circuit then safe have no problem friends may like this circuit. Because the equipment seeks easy, build not difficult too.

I have old GPS, usually, I use it in my car. We need to have DC to DC converter circuit that can reduce voltage 12V to 5V at current more than 2A.
Which circuit diagram can make this. I like it that need buy some parts since I have also in my stores.
12v to 5v converter on my cay for GPS
As Figure 2 I assemble them on universal board

Other similar circuits.

  1. Microprocessor dc regulator supply 5V 3A by LM323K
  2. 5V 3A switching power supply by LM2576
  3. LM2673 -5V 3A Switching Voltage Regulator
  4. Power supply 5V 2A by IC 78S05
  5. Top Linear power supply regulator 5V 5A with 7812 and LM723

This Post Has 24 Comments

  1. 12V to 5V 3A DC converter step down Regulator shows r2 as 0.22 ohm resistor. what should it be?

  2. I had a typo on my previous request. On circuit 12V to 5V 3A DC converter step down Regulator, shows r1 as 0.22 ohms, what is the correct value?

  3. I would like of schematic diagram circuit of voltage regulador that can input with voltage between 6V and 13V and has constant 5V output for 1A

  4. Hi, Petro_Mustafa
    Thanks for feedback.

  5. what wattage are the resisters? at 500ma R5 melted. For bd140 I used nte242, for bc556 I used nte232 for mj2955 I used nte332. I know nte332 needs a big heat sink …what about the rest?

  6. nice, what would be the voltage in 4700 microfarad capacitor?

  7. how many resistance required to convert 60 v dc to 50 v dc

  8. Hi, reyn
    Thanks for your feedback.
    You can use the Capacitor’s voltage more than 25V.

  9. How to convert 12v 7.2ah battery to 5v 15A output.?

  10. 24v to 12v 10amp please help me

  11. 24v to 12v 10amp dc to dc please help me

  12. How to decrease ampere 5ampere to 1ampere.
    Plz help me…..

  13. 12v to 3amp fir el wire stripe?

  14. How to convert 24V to 12v using opto-isolation please help me.

  15. Noob questions,
    If i used 12v 6A input it still 3A output?

  16. Why resistor 18ohm is hot to touch?

  17. 250v to 5v how to convert

  18. Can i replace voltage regulator to ka7805?anyone know?

    1. Hi Zul,
      Yes, you can. Since the IC-7805 can tolerate about 25V input. But I think you should max 18V because it not heat. If you use over voltage you need to change R5-18 ohms to 22 ohms or more as rating voltage input.

      1. Thank you

  19. i need a laser charger for my comprises a 30c battery with 12v o/p.
    it looks very difficult to buy.need help ,where to buy? abubakhar9088agmail.COM

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