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12v UPS for Mini PC

Mike- N7ETA

A few years ago, I decided to upgrade my PC. In researching, I found a mini fan-less PC that runs on a 12v wall wart. After researching my software wouldn’t have any issues I purchased and installed the software I use.

The only issue I had was that even with my off the shelf UPS system the PC would reboot during bad weather. I investigated and found the wall wart was susceptible to power line transits.I thought about using one of my ham radio power supplies, which I thought was way over kill.

Searching the internet I found that battery operation was preferable. But then again it was much more than I needed. Then on “YouTube” I found them using an oversize AA with a voltage of 3.7v. This is actually called a 18650 cell as the designated size. What was impressive was the different capacities viable on “Amazon”. These cost from $2.25 in multiples and capacities from 2000mah to 9900mah 

More research indicated I could build a DIY UPS with no switching time and a fairly large run time. Since the most time I have been without power has been less than 1 hour. So I sat down and worked out a wiring diagram. The schematics program I use is called “Fritzing”.  Here is a link to the webpage for the software. https://fritzing.org/

Here is the parts list, cost supplier.

12v 18650 UPS BOM
QTYLabelPart TypeUnitPart NumberSupplier
1CaseEnclosure$18.99Blue Metal Enclosure.7 x 4.33 x 3.1 inchAmazon
1120vac to 12vdcS-350-60 Power Supply$12.9812v @ 5ampAmazon
15.15V OutGeneric female header – 2 pins$1.44Terminal Binding Post Spring Clip 2-WayAmazon
1AC1AC Power$1.83Inlet Module Plug Socket Power EntryAmazon
3Bat118650 Battery$5.973.7v @ 9900maAmazon
1C1Electrolytic Capacitor$0.35470ufAmazon
1D1Rectifier Diode$0.051N4007Amazon
1DS2Y-5-DC5V1DS2Y-12-DC12V$1.00HK19F-DC 5V-SHG Signal RelayAmazon
1LED1LED$0.043mm Green (570nm)Amazon
1R1Resistor$0.05470kΩAmazon
1S1Push-button$0.53Momentary (NO)Amazon
1TP1BMS Li-ion Charger$0.643S 12V 10A 18650 Lithium Battery Protection BoardAmazon
1U1Buck converter$3.24Mini-360 Step-up DC-DCAmazon
1VM1Voltmeter$2.163 digit LED  (2 wire)Amazon
Total$49.27

Here are a couple of pictures of the finished unit.

The Future-

Since I also operate a couple of Raspberry Pi’s 24/7, I am refining the schematic with a couple of changes and will build one for 5v.

Mike- N7ETA (Extra Terrestrial Amateur)

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CARC August Meeting

This month’s agenda:

Presentation by Roger Mull about Winlink forms and their importance, Repeater update, Club reports

Meeting Zoom

Join Zoom Meeting https://us02web.zoom.us/j/83141052514?pwd=bEE3NEtua2s4Y2kzQXg0LzlCcHJzZz09

Meeting ID: 831 4105 2514

Passcode: 806718

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CARC July Club Meeting

This month’s meeting Agenda: Monday July 1, 2024 at 7pm

  • Field Day Review
  • Club Repeater Project
  • Club Net Manager / Net Controllers
  • Tiny SA Ultra Demonstration: Signal Analyzer – Test HTs and more
  • Open Discussions

Zoom Details:

Join Zoom Meeting https://us02web.zoom.us/j/83141052514?pwd=bEE3NEtua2s4Y2kzQXg0LzlCcHJzZz09

Meeting ID: 831 4105 2514 Passcode: 806718

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June 19th 7:00 pm Pre-Field-Day Fireside Chat

Join us June 19th at 7 pm for the last call before Field Day, this is the call to learn more about how you can help with Field Day and information for those who want to set up to operate.

Join Zoom Meeting
https://us02web.zoom.us/j/84759015167?pwd=d3vZj0qpQxB49pMojybp3u9q2UUSnV.1

Meeting ID: 847 5901 5167
Passcode: 355640

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CARC ARRL FIELD DAY PLANNING CALL (RESCHEDULED)

Field Day

Join us on the CARC ARRL FIELD DAY planning call on Friday, June 14th, at 7 p.m. We look forward to hearing from you!

Join Zoom Meeting
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Meeting ID: 831 9672 0166
Passcode: 532997

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June 2024 Hams and Eggs Breakfast

Did you know that you don’t have to be a Ham to join our breakfast? We welcome all who want to learn about all types and levels of radio communications! The next breakfast meeting is on Saturday, June 15th.

Permanent link to this article: https://w4cae.com/june-2024-hams-and-eggs-breakfast/

Ham Radio Dashboard

Here is a great tutorial on how to get your Ham Radio Dashboard up and running. https://www.youtube.com/watch?v=sIdqMQTGNSc

You can download the zipped files down below.

Permanent link to this article: https://w4cae.com/ham-radio-dashboard/