Power supply question

I'm working on making an external hard drive enclosure. It will require 12v and 5v connections. I am thinking about using a 12v power supply along with a 5v step down.

the parts I'm wanting to use are. https://www.amazon.com/dp/B08MCCSP38/?coliid=IGTEQDJ1Z8UYG&colid=2Y2WLETYUI3XK&psc=1&ref_=lv_ov_lig_dp_it


Does this seem to be a reasonable plan and are these the right parts?

by johnnymac
March 23, 2021

That seems like it will work. there are also power supply's with both 12 and 5V outputs

by Garrett
March 23, 2021


Thank you for the response. I'll look around and see if i can find one with both, but if this will work I am happy.

by johnnymac
March 23, 2021

That looks like a switching power supply, which produces high frequency interference which CAN disturb your electronic.

by vanderghast
March 24, 2021

The working voltage of the hard disk is +12V and +5V, and the working current is 0.50A-0.80A, about 0.65A. +12V provides power to the spindle motor and seek motor of the hard disk. +5V provides power to the hard disk's circuit board. Power supplies with 12V and 5V output are no problem. You can also find more on https://www.newomi.com/search?keywords=Power%20Accessories Power Accessories

by chinchuan
April 26, 2021
Add comment...

Please sign in or create an account to comment.

1 Answer

Answer by febb

You need step down DC-DC back converter, like car cigarette power converter to USB 5V. There are millions chips and solutions. On Aliexpress you can find a lot for less then 1$: MINI DC-DC STEP DOWN CONVERTER. Check what power HDD required on 5V rail. Usually it is less then 1A.

+1 vote
by febb
April 10, 2021
Add comment...

Please sign in or create an account to comment.

Your Answer

You must log in or create an account (free!) to answer a question.

Log in Create an account

Go Ad-Free. Activate your CircuitLab membership. No more ads. Save unlimited circuits. Run unlimited simulations.

Search Questions & Answers

Ask a Question

Anyone can ask a question.

Did you already search (see above) to see if a similar question has already been answered? If you can't find the answer, you may ask a question.

About This Site

CircuitLab's Q&A site is a FREE questions and answers forum for electronics and electrical engineering students, hobbyists, and professionals.

We encourage you to use our built-in schematic & simulation software to add more detail to your questions and answers.

Acceptable Questions:

  • Concept or theory questions
  • Practical engineering questions
  • “Homework” questions
  • Software/hardware intersection
  • Best practices
  • Design choices & component selection
  • Troubleshooting

Unacceptable Questions:

  • Non-English language content
  • Non-question discussion
  • Non-electronics questions
  • Vendor-specific topics
  • Pure software questions
  • CircuitLab software support

Please respect that there are both seasoned experts and total newbies here: please be nice, be constructive, and be specific!

About CircuitLab

CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems.