This cable is kinda fascinating - it has an integrated boost converter, so you can plug it into any USB port (from a computer, battery pack, etc) and it will give you a higher DC voltage! It's a handy way to power 12V powered devices with a center-positive 2.1mm DC barrel jack from a USB port. We also have a version that provides 9V, and if you just need a passthough cable, here's one for 5VDC.
These are rated at 500mA output, but you can go a little higher, Adafruit pulled 700mA and Adafruit got a little voltage droop but it worked fine. Probably best not to draw 700mA continuously though!
Here's Adafruit's measurements for various current draws when Adafruit set Adafruit's bench supply to provide a steady 5V voltage
- 50mA (12.4V output), 150mA, 83% efficiency
- 100ma (12.4V), 290mA in, 86% efficiency
- 200ma (12.3V): 570mA in, 86% efficiency
- 300ma (12.2V): 870mA in, 84% efficiency
- 500ma (12.1V): 1500mA in, 81% efficiency
- 700ma (11.4V): 2140mA in, 75% efficiency
So, overall there's a 85% efficiency at low current draw that drops do about 80% at high current use. There's also a 3 mA quiescent current. Note that often times the USB port voltage can droop too, and in addition you may have power losses with any thin or low quality cables with high resistivity!
This product is listed in:
Documentation and Resources:
- The Maker Revolution
The Maker Revolution celebrates the creation of new devices and the modification of existing ones - the transition from a consumer buying goods to eventually having a major part in their creation. The Maker Revolution places strong emphasis on free (...
- Powering Portable Projects: Batteries
Want to make your project portable? We've put together a quick guide to get you up to speed on battery options and help you decide which batteries might be best for your project. Batteries are a whole different game to plug packs and benchtop power s...
We deliver Australia-wide with these options:
- $3 for Small Items (4-6 days, not tracked, only available on selected small items)
- $6.95 for Standard Post (2-4 days, tracked)
- $8.32 for Express Post (1-2 days, tracked)
- Pickup - Free! Only available to customers who live in the Newcastle region (only after we email you to notify your order is ready)
International Orders - the following rates are for New Zealand and will vary for other countries:
- $11.49 for Pack and Track (3+ days, tracked)
- $16.50 for Express International (2-5 days, tracked)
If you order lots of gear, the postage amount might increment based on the weight of your order.
Our physical address:
Unit 18, 132 Garden Grove Parade
Please checkout our customer service page if you have other frequently asked questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.