Vehicle USB Power

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captainkirksdog

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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>
 
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**
 
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>
 
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