Mic Mini
Mic Mini
Is it possible to run a mini computer on AA batteries?
It is a custom computer roughly the size of a TI calculator. It has 2 ddr2 ram, a ssd that hooks to the motherboard via BGA, a small screen, a mini keyboard like those on blackberry phones, an i7 3.2 GHz cpu, 4 usb, ethernetport, mic/headphone ports, an internal wireless card, and an onboard video chip. I am going to try running it with four AA batteries.
In short, not a chance.
An i7 3.2GHz CPU alone draws about 130 Watts. An individual AA cell provides between 2500 and 3000 mAhr, or say, a max of 4.5 Watt-hr. So add up your four AA cells, and you get 18 W-hr of energy.
Now, of course, that's not going to deliver the various different voltages your system needs (+12Vdc, +5Vdc, +3.3Vdc, -12Vdc).. is there a Power Supply for this unit? Your four AA cells can provide at most 6V, which itself does you go good at all... you need a power supply of some sort to allow one input voltage (a battery) to provide every voltage the PC motherboard needs. Most laptops take in 14V or so, not 6V. And even 9 or 10 of these cells won't do the job... read on.
So et's forget about what power supply you're going to use for now (the regular one for a desktop PC runs off 110V/220V AC, you can't use that one), and assume the power supply does a perfect conversion (it doesn't, most are 80-90% efficient).
So that CPU... 130W on a 18W-hr battery. Converting, that would be a 64,800 W-sec battery. So you could run that CPU (assuming that perfect power supply) for 498 second, or 8 minutes. Of course, if you factor in any real power supply, you're more like 7.5 minutes. The add memory, screen, ethernet, etc. and you're going to run for maybe a minute or two.. not long enough to actually boot any modern OS. If you used a lower power laptop CPU, you would get much farther, but it's still not a practical system. Even cell phones would not work well from AA cells.
The other problem is this: you're assuming four AA cells could actually provide that much power that fast... a 130W draw would demand 43A of current from each 1.5V cell. A typical AA cell might actually be able to provide an amp or so.. drawing 45A would be no different than a short circuit, the battery would burn up or even possibly explode.
Alkalines have a relatively high internal resistance.. they drop significant voltage as heat when subject to high current draws... that's why NiMh cells, with lower A-hr ratings, actually last longer in high current apps (digital cameras, RC cars, photoflash, DVD players, etc). But even plain old everyday NiMh cells don't usually supply this much current, you need the specialized sort they use in R/C car batteries, hybrid cars, and, well, laptop cells.
To go with the laptop cell, you need a laptop-style power supply and power management. The battery in my laptop, which has an Core 2 processor specialized for low power consumption (as do most laptops) has over 100W-hr capacity, and the ability to deliver serious surge currents as need be. However, if the CPU ran full out, that laptop wouldn't stay on for 1/2 hour. With power management in the OS, it runs 2.5 hours or so on that battery.
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More Shops That Offer Mic Mini...
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Mini iPhone Microphone $12.99 iPhones do many things. Some of these things are done with the greatest of ease, as is demonstrated by those commercials that show a guy on a phone call who is also texting, looking up movie times, finding a restaurant, and probably playing Minesweeper. Heck, the iPhone is so magical it's probably talking to someone on the other line and keeping them entertained while he's helping his hapless movie buddy. But there's one thing iPhones don't excel at doing and that's recording audio. This could partially stem from the fact that your iPhone receives sound through the speaker in the bottom. If your big mitts are holding the phone, you're at least partially blocking the reception, and even if you weren't, iPhone recorded audio tends to sound a bit like talking through a pillow. The clarity leaves much to be desired. Plug the Mini-Mic into your headphones jack and be prepared to be amazed at the leap in quality! This plug and play microphone is small, lightweight, and portable and requires no battery or wires. Just pop it in, point it in the direction you want to record, and go! The multi-directional adjustment allows you to focus the recording exactly where you need it - inward for narrating, upward for fancy news interviews, or outward if you're recording video. |
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SmartTalk iPhone Headphone/Mic Adapter $14.99 The iPhone is our good good friend... but somehow with all of Apple's amazing ingenuity and engineering its headphones are the suck. They don't fit in your ears, the rubber around the outside of the earbud deteriorates, the wires get hopelessly tangled... and oh yeah, the sound quality is a bit meh. Unfortunately due to the inherent usefulness of the built in mic and tiny button on the cord we've been stuck with the Apple earbuds. Until now that is. The SmartTalk iPhone Headphone/Mic Adapter allows you to plug your own headphones into the iPhone but gives you a cord based mic and button to replace the one your otherwise vastly superior headphones are lacking. So go ahead, use those big DJ headphones to chat while you saunter down the street in style. |
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Black Ops Throat Mic iPhone Headset $119.99 Maybe the closest you've seen to real military combat is Call of Duty, but that doesn't mean you need to settle for second best in a cell phone headset. Do you think spec ops agents parachuting into enemy territory put up with the stock iPhone headset that picks up tons of wind noise? Not likely. Instead they use headsets based on Throat Mic technology. What is a Throat Mic you say? Glad you asked! A Throat Mic hugs your neck and picks up sound directly from your vocal cords. This allows for two main features. You can whisper and still be heard clearly on the other end and the person you're speaking to hears no outside sound, only your voice. Therefore a throat mic based headset is perfect to use in any noisy environment... like while laying down mortar rounds, or cruising in your convertible. |
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Rok-klimer Mini Rechargeable Car Flashlight $14.99 Mini and compact, the Rok-klimer Rechargeable Car Flashlight provides a light source in times you really need one. Taking a look under the hood, looking for something in the trunk, or changing a tire all become easier after sundown with this mini flashlight. Charge it in your cigarette lighter (not power outlet) and keep it as a back-up light source that’s right at your fingertips when you need it. Checking property after hours, making a run to the storage unit late at night, or trying to maneuver dark stairs of an apartment unit or in a warehouse when the light is burned out (and many other uses) make the Rok-klimer Mini Rechargeable Car Flashlight a must-have car accessory for any of your emergency or back-up lighting needs. Made with rugged heavy-duty aluminum and a 28-lumen bulb this flashlight can go where you go. Get one for yourself, give it as a gift, or stuff stockings at Christmas, it provides added security for mothers, wives and driving-age children, not to mention those rough and tough guys like it too. |
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Rok-Klimer Mini Rechargeable Car Flashlight with Gift Box $19.99 The Rok-Klimer Mini Rechargeable Car Flashlight is a must-have car accessory for any of your emergency or back-up lighting needs. Now featured in a compact metal case, this item is travel-friendly and makes for a wonderful gift. Give it as a gift to a loved one for the holidays, add it to the emergency kit, or stow it away in the dashboard of your vehicle. No batteries are necessary with the Mini Rechargeable Car Flashlight, which has the capacity to plug into the cigarette outlet in your car, and receive a full charge in less than an hour. |
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Startech Mini DisplayPort VGA Adapter Converter $28.99 Startech Mini DisplayPort VGA Adapter Converter |
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Toshiba Dual Function Hardshell Case for Mini Notebook $29.99 Toshiba Dual Function Hardshell Case for Mini Notebook |
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Toshiba USB Optical Retractable Mini Mouse $14.99 Toshiba USB Optical Retractable Mini Mouse |