Vehicle USB Power

[captainkirksdog]

Hello,
I am a diabetic and I recently bought a Bayer Contour USB Blood Glucose meter. I'm going hunting next month and I won't have any way of recharging it. Does anyone have a good quality design or schematic for building a vehicle-powered USB recharger? Something fairly steady with high transient-voltage protection. Thanks for your time. <ckd>

 

[DemonicSandwich]

The simplest way of charging it from a vehicle would be to use a 5 volt regulator, 1-2Ω resistor, and a 16v zener.

The problem with that method is that the regulator will need a heatsink for anything over 100mA.

A quick 5-second search on Google Shopping yields more favorable alternatives.
vehicle usb charger

**broken link removed**

 

[blueroomelectronics]

Buy one, they're so cheap.

 

[captainkirksdog]

Thanks, guys, for the replies. Initially I wanted to build one, but I took a look at eBay and found one for less than 2 bucks-including shipping! Now if it can get here before I disappear into the mountains, I'll be just fine. Thanks, again! <ckd>

 

[blueroomelectronics]

Some things are so cheap they're simply not worth building from scratch.

 

[ben7]

Some things are so cheap they're simply not worth building from scratch.

But they might last a few weeks, whereas a well built homemade one might last years!

-Ben

 

[RMMM]

But they might last a few weeks, whereas a well built homemade one might last years!

-Ben

Or vice-versa!

Its awful hard to win at this game of life.