Cellphone battery booster built at the checkout counter

When you’re away from home and your cellphone runs out of juice it can be a real downer. Sure, you could find a store and buy a wall charger, but wouldn’t it be more fun to build your own battery booster without using tools? [Spiritplumber] did just that, popping into a Radio Shack for the parts, then making his how-to video (embedded after the break) while standing at the checkout counter. You can see he hust set his camera on top of the battery display case and got to work.

He’s using four D cell batteries to provide 6 volts of power. Assuming your phone charges at 5 volts this is going to be just a bit too high, even though there’s some tolerance with most phones. To overcome that obstacle he added a diode to the circuit, taking advantage of the 0.7 volt drop that it brings to the mix. Grab a plug adapter for your model and then just hand twist the connections. [Spiritplumber] admits it would be better to solder these, but in a bind you can get away with it. We looked up some prices for this method and we figure this would cost around $18 (batteries included) depending on the price of the plug adapter for your phone.

Of course if you’re just looking for a way to charge your phone without paying consumer prices there are ways of accomplishing that as well.

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Meet Radio Shack’s new Parallax lineup

It looks like Radio Shack is pretty serious about their new found commitment to their focus on the DIY, inventor, creator and geek demographics. [Ken Gracey], Parallax forum guru, put up a post on the Parallax stuff that will be sold at Radio Shack. Everything is priced, “below spousal approval level,” but no word on what those prices are.

Here’s the (probably not conclusive) list we gleaned from the pics: 2-axis joystick, gyroscope, GPS, compass and altimeter modules, an infrared sensor, 2×16 backlit LCD, BASIC stamp 2 board, and an XBee 2-pack that we assume would be priced above girlfriend approval levels.

We’re curious about how many (and in what quantity) of these items will be stocked at the East Nowheresville strip mall, and again there’s no mention of improving the selection of individual components.

At Hack A Day, we were thinking how amazing a Radio Shack ‘component vending machine’ would be. A modified pick and place machine that will dole out caps, resistors, other components, and has the potential to be competitive with online stores. Anyone feel like sending that suggestion in?

Radio Shack will now stock cellphones, cellphone accessories, Arduinos

A few months ago, we covered Radio Shack’s efforts to suck less, and the Radio Shack DIY team has now come back with the top ten suggestions submitted. Of course Arduinos make the list at number 1, which we somewhat expected for beginner projects.  Here’s the entire list in order:

  1. Arduino
  2. More kits and project suggestions
  3. More introduction/instructional books
  4. Larger LED selection
  5. Larger resistor selection
  6. TONS more capacitors
  7. DIY audio and speaker equipment
  8. HAM radio gear
  9. More competitive pricing
  10. Stronger sales force

Pocket multimeter review

three_pocket_multimeters

Reader [Mikey Sklar] told us about a review he wrote covering 3 different models of pocket multimeters. We’re sure that you’ve had the same experiences we have being the go-to-guy or got-to-gal  for all things electrical. For our sort, having a multimeter on hand at all times has become an expectation.

[Mikey] looks at a model from ebay, Harbor Freight, and Radio Shack. Not surprisingly, the ebay offering doesn’t rate too well but does get the job done. We were surprised to read that he picked up the Cen-Tech model for about $10 at Harbor Freight. Although it may no longer be sold there (we haven’t checked) [Mikey] seems pretty happy with it so we’ll be on the lookout during our next tool-buying trip. We’re unfamiliar with the tiny Radio Shack 22-820 but we’ve always been happy with our larger 22-811. The 22-820 allows the probes to be folded up inside of the case cover for a truly pocketable package.

You can never have too many meters at your disposal and we’ll have to keep this article in mind the next time we’re shopping for another. Never used a multimeter before? Take a look at the tutorial [Mikey] linked to over at ladyada.