Topic: my power went out
Catherine !TGirlYJKXM started this discussion 11 years ago #47,790
Thinking of getting a hand crank for my phone in case I need to charge it for an extended blackout. Should at least have a phone going for news, etc.
May I have some recommendations?
May I have some recommendations?
Fedoraman !FeDoRAqAy6 joined in and replied with this 11 years ago, 4 minutes later[^] [v] #625,550
Seriously?
Anonymous C joined in and replied with this 11 years ago, 14 minutes later, 18 minutes after the original post[^] [v] #625,551
Anonymous D joined in and replied with this 11 years ago, 1 hour later, 1 hour after the original post[^] [v] #625,558
@previous (C)They exist! I have one. I wouldn't dare using it directly on my phone, but I use it to charge a battery pack which then charges my phone.
This is the one I have: http://www.dx.com/p/dynamo-hand-crank-usb-cell-phone-emergency-charger-green-209282
@OP
I would be seriously worried about the fluctuating power output somehow fucking with my phone. So I only use it on USB recharegable battery packs.
For your situation I would recommend getting a battery pack instead. They're much more likely to
1) Not fuck up your phone
2) Not be a minimal power output for a lot of work
You can get a battery pack that'll charge your phone for a day or two, though I suppose they'll be more expensive than that hand crank charger lol.
Anonymous E joined in and replied with this 11 years ago, 3 hours later, 5 hours after the original post[^] [v] #625,577
kook !!Phkn/3Gic joined in and replied with this 11 years ago, 13 minutes later, 5 hours after the original post[^] [v] #625,579
they make batteries that you can charge and just save for emergencies
squeegee joined in and replied with this 11 years ago, 26 minutes later, 5 hours after the original post[^] [v] #625,581
@previous (kook !!Phkn/3Gic)
in an emergency you can always remove an alternator from a car, modify it with a hand crank, and use it to charge up a car battery. with a bit of wiring and a resistor or two you can then hook up a cigarette lighter thing and recharge your phone practically for free
in an emergency you can always remove an alternator from a car, modify it with a hand crank, and use it to charge up a car battery. with a bit of wiring and a resistor or two you can then hook up a cigarette lighter thing and recharge your phone practically for free
(Edited 16 seconds later.)
Anonymous D replied with this 11 years ago, 13 minutes later, 6 hours after the original post[^] [v] #625,583
kook !!Phkn/3Gic replied with this 11 years ago, 16 minutes later, 6 hours after the original post[^] [v] #625,584
@625,581 (squeegee)
My step dad has hooked up a car battery to a door that we dont use as a booby trap
My step dad has hooked up a car battery to a door that we dont use as a booby trap
Anonymous E replied with this 11 years ago, 6 minutes later, 6 hours after the original post[^] [v] #625,586
Anonymous H joined in and replied with this 11 years ago, 32 minutes later, 7 hours after the original post[^] [v] #625,597
Lovelyfe !KansasxqvM joined in and replied with this 11 years ago, 18 seconds later, 7 hours after the original post[^] [v] #625,598
Catherine !TGirlYJKXM (OP) replied with this 11 years ago, 13 minutes later, 7 hours after the original post[^] [v] #625,601
@625,581 (squeegee)
Really? That is interesting.
@625,586 (E)
I saw a product on Amazon that is essentially the pedals of a bike. I always found these methods of power to be interesting since learning about a prison in Arizona using it to power a television. It was the warden's way of rewarding inmates who chose to exercise. The bad news was that if you get tired too early before your show ends you probably wouldn't be able to catch the ending.
@625,577 (E)
lol Tin can telephones. Can the multiple one depicted here actually work though or is it just a gag?
@625,558 (D)
That's actually a pretty good idea. Thanks for the suggestion. ^_^
> 3.77
> USD
Wow! The ones I found on Amazon go for $22+. Wtf?
Really? That is interesting.
@625,586 (E)
I saw a product on Amazon that is essentially the pedals of a bike. I always found these methods of power to be interesting since learning about a prison in Arizona using it to power a television. It was the warden's way of rewarding inmates who chose to exercise. The bad news was that if you get tired too early before your show ends you probably wouldn't be able to catch the ending.
@625,577 (E)
lol Tin can telephones. Can the multiple one depicted here actually work though or is it just a gag?
@625,558 (D)
That's actually a pretty good idea. Thanks for the suggestion. ^_^
> 3.77
> USD
Wow! The ones I found on Amazon go for $22+. Wtf?
(Edited 1 minute later.)
Anonymous E replied with this 11 years ago, 15 minutes later, 7 hours after the original post[^] [v] #625,608
@previous (Catherine !TGirlYJKXM)
Multiple tin can phone works. Will only take you 10 minutes to dig up some cans from trash and wash them.
For every extension you add the acoustic wave energy is diminished. Each party just has to talk louder. Its also important to keep the string tight on each end.
@625,584 (kook !!Phkn/3Gic)
kook there must be more to that hook up cause 12VDC from a hand to Burglar with regular shoes, is just not going to do anything.
Multiple tin can phone works. Will only take you 10 minutes to dig up some cans from trash and wash them.
For every extension you add the acoustic wave energy is diminished. Each party just has to talk louder. Its also important to keep the string tight on each end.
@625,584 (kook !!Phkn/3Gic)
kook there must be more to that hook up cause 12VDC from a hand to Burglar with regular shoes, is just not going to do anything.
Catherine !TGirlYJKXM (OP) replied with this 11 years ago, 4 minutes later, 7 hours after the original post[^] [v] #625,611
Anonymous E replied with this 11 years ago, 1 minute later, 7 hours after the original post[^] [v] #625,613
@previous (Catherine !TGirlYJKXM)
Worked well enough from a tree house to my house. Mom could give me notice dinner was ready. String was also a good place for birds to hang out on.
Worked well enough from a tree house to my house. Mom could give me notice dinner was ready. String was also a good place for birds to hang out on.
FuckAlms !vX8K53rFBI joined in and replied with this 11 years ago, 30 seconds later, 7 hours after the original post[^] [v] #625,614
@625,608 (E)
> Each party just has to talk louder.
Apparently everyone thinks cell phones are tin cans.
> Each party just has to talk louder.
Apparently everyone thinks cell phones are tin cans.
Anonymous K joined in and replied with this 11 years ago, 13 seconds later, 7 hours after the original post[^] [v] #625,615
@625,611 (Catherine !TGirlYJKXM)
Have you ever used a tin can phone?
I have and the reception is very tinny.
Have you ever used a tin can phone?
I have and the reception is very tinny.
Catherine !TGirlYJKXM (OP) replied with this 11 years ago, 3 minutes later, 7 hours after the original post[^] [v] #625,616
Anonymous L joined in and replied with this 11 years ago, 1 minute later, 7 hours after the original post[^] [v] #625,617
Thank you Google replied with this 11 years ago, 11 minutes later, 7 hours after the original post[^] [v] #625,622
Optimizing a tin can phone
Q:
Hi,
I was wondering what parameters that affect the efficiency of a tin can telephone? Or rather, why do these parameters (material, shape etc.) affect the efficiency? What would an optimum can phone look like?
- Viktor Linders
Malmö, Sweden
A:
By "efficiency", I will narrowly interpret this to mean how you can have the loudest
response on the far end per unit loudness on the sending end. To be more specific,
and to use the usual term for efficiency, we want the ratio of the acoustic energy
produced at the receiving end to the acoustic energy directed at the can
at the sending end.
Well, first of all I wouldn’t make the phone out of tin cans. The idea is to have a diaphragm that vibrates and pulls on the string connecting the cans. The base of a tin (or more likely, steel) can is very stiff and is rigidly attached to the side of the can. Speaking into the can will cause the base to vibrate, but will also make the whole can move back and forth as a more or less rigid object (the resonant frequency of the can is fairly high, in the audio range). If the sides of the can are vibrating, then acoustic energy will be coupled to your hand (very lossy, squishy, damping material) and lost. You can mitigate this by holding the tin can on another string, but why go to the bother?
A step up is to use a paper cup. The bottom of a paper cup moves much more freely with respect to the rest of the cup and may lose much less energy when it vibrates. Loudspeaker cones are usually made of paper, and have special mounts on their rims to reduce the mechanical coupling to their supports.
The string is less important - ideally it should be lightweight and not stretchy. Sewing thread should be good. Heavy rope is a bad idea - lots of internal rubbing happens when it’s pulled on. The longer the string is, the more lossy it will be (again, internal friction, and also some coupling to the air), so put the cans/cups close together. Usually it’s a good idea to have as much tension in the string as the cups will stand.
If you just want loudness at a very small, localized spot, you can put an ear horn on one end, which you can hold up to your ear to focus whatever acoustic energy you get out into your ear with as little loss as possible.
Tom
Q:
Hi,
I was wondering what parameters that affect the efficiency of a tin can telephone? Or rather, why do these parameters (material, shape etc.) affect the efficiency? What would an optimum can phone look like?
- Viktor Linders
Malmö, Sweden
A:
By "efficiency", I will narrowly interpret this to mean how you can have the loudest
response on the far end per unit loudness on the sending end. To be more specific,
and to use the usual term for efficiency, we want the ratio of the acoustic energy
produced at the receiving end to the acoustic energy directed at the can
at the sending end.
Well, first of all I wouldn’t make the phone out of tin cans. The idea is to have a diaphragm that vibrates and pulls on the string connecting the cans. The base of a tin (or more likely, steel) can is very stiff and is rigidly attached to the side of the can. Speaking into the can will cause the base to vibrate, but will also make the whole can move back and forth as a more or less rigid object (the resonant frequency of the can is fairly high, in the audio range). If the sides of the can are vibrating, then acoustic energy will be coupled to your hand (very lossy, squishy, damping material) and lost. You can mitigate this by holding the tin can on another string, but why go to the bother?
A step up is to use a paper cup. The bottom of a paper cup moves much more freely with respect to the rest of the cup and may lose much less energy when it vibrates. Loudspeaker cones are usually made of paper, and have special mounts on their rims to reduce the mechanical coupling to their supports.
The string is less important - ideally it should be lightweight and not stretchy. Sewing thread should be good. Heavy rope is a bad idea - lots of internal rubbing happens when it’s pulled on. The longer the string is, the more lossy it will be (again, internal friction, and also some coupling to the air), so put the cans/cups close together. Usually it’s a good idea to have as much tension in the string as the cups will stand.
If you just want loudness at a very small, localized spot, you can put an ear horn on one end, which you can hold up to your ear to focus whatever acoustic energy you get out into your ear with as little loss as possible.
Tom
(Edited 18 seconds later.)
Metæ? joined in and replied with this 11 years ago, 3 minutes later, 7 hours after the original post[^] [v] #625,626
@625,581 (squeegee)
This sounds like something Syntax would do after getting shot down behind Soviet lines during the Cuban Missile Crisis.
This sounds like something Syntax would do after getting shot down behind Soviet lines during the Cuban Missile Crisis.