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Old 07-05-09, 01:52 AM   #1
dffis
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using generator hubs

Would it be posible for a modern generator hub to generate enough electricity to power a few 6 inch speakers and maybe a sub. I know nothing about electric stuff so i figured i would ask. Im guessing its not possible so do you guys have any other ideas for power(car batteries perhaps)? Thanks
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Old 07-05-09, 07:51 AM   #2
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"Would it be posible for a modern generator hub to generate enough electricity to power a few 6 inch speakers and maybe a sub."

Simply put, no.
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Old 07-05-09, 07:30 PM   #3
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I think the shimano hub claims 6V and 3 Watts. If you want a bike nerd project you could rig a bunch of bottle generators ... ok I won't go there.
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Old 07-06-09, 10:41 AM   #4
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You can get ~12W out of a Shimano hub, That would allow you to drive a smaller sound system.
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Old 07-08-09, 06:14 PM   #5
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A Radio + speaker consumes far less power than 3W. However, you will need to ensure a _constant_ power source (some form of capacitor, etc.) vs the varying output from the generator hub.
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Old 07-08-09, 07:09 PM   #6
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Originally Posted by saltytri View Post
"Would it be posible for a modern generator hub to generate enough electricity to power a few 6 inch speakers and maybe a sub."

Simply put, no.
Less simply put, maybe.

Do you already have your stereo set up? If so, power it with a 12v gel cell, and get a cheap ammeter and measure the current drawn. For example, I've found that my stereo is quite loud at 12 watts total being used. The size or number of speakers used really isn't much of a factor -- what matters is how efficient your amp is and how loud you've got it set.

Now, most hubs provide 6v and about 0.5 amps -- 3 watts. AC. 12v of steady DC is needed to use auto stereo equipment, so you'd need to rectify the power, smooth it out and increase the voltage, and even then three watts is pretty minimal.

You might be able to find a pair of computer speakers that works on a few watts and 6 volts. (With the music coming from an iPod or something similar.) Won't be as loud as car audio gear, but can still be pretty loud. You'll probably still need to rectify and smooth the power, however. Or just use a radio -- 3 watts will far more than enough for a small one.

Or maybe you can just go ahead and use car stereo gear at 12v and carry a gel-cell battery, and rig up your generator to charge it (you'll still need to get 14v or so DC, of course.) The charging will give you somewhat longer runtime and will let you claim that it's at least partially human powered. Or totally human powered if that's the only way you charge the battery.
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Old 07-08-09, 07:13 PM   #7
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If you need to cart around a sub the weight of a battery isn't going to make much difference.
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Old 07-08-09, 07:18 PM   #8
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Originally Posted by dougmc View Post
Or maybe you can just go ahead and use car stereo gear at 12v and carry a gel-cell battery, and rig up your generator to charge it (you'll still need to get 14v or so DC, of course.) The charging will give you somewhat longer runtime and will let you claim that it's at least partially human powered. Or totally human powered if that's the only way you charge the battery.
This is probably not what the OP had in mind, but with enough batteries you can power a Hammond organ to tow behind your bike (a trike is perhaps better).

Read on: http://hpv.tricolour.net/organ-trailer.html

This setup draws 332 watts...
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Old 07-19-09, 10:17 PM   #9
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dffis: Not sure what your requirements are, but I'm test listening the iHome ih85BX, which mates an iPod to a powered monaural speaker, with a handlebar mounted RF remote control. The review I wrote and some comments are avaialble here: http://tinyurl.com/mwanld. the short version is that it sounds pretty good, I don't know how long the 4 AA batteries will last yet, and it turns my fancy video iPod into an iPod "Shuffle", because the remote is buttons only, no display, so you can't tell what album, artsit, or song is playing. Its splash resistant too.--george
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