Archive for November 1981

Why Does One Earphone Usually Stop Working Before the Other? Asked by Nicola from Basingstoke   Leave a comment

headphonesSome of the expert writers on the net are at such a top level that i ponder if any of them have ever written a book? so sometimes i like to spotlight these outstanding articles and here is one i thought was interesting the other day.

Hi Nicola, how’s the weather in Basingstoke? Oh, I’m sorry to hear that (lol).

There are numerous causes for this common (yet absurdly irritating) phenomenon. Usually, however, it is simply due to a loose wire and can often be fixed by pushing the wire towards the earpiece and, if needs be, affixing it into place with a little electrical tape, super glue, or some other adhesive.

Sometimes, if the headphones have an inline volume wheel, that can be the cause. That one is a little trickier to fix, but you could always try the ‘wire trick’ mentioned above and see if it works. If not, then open the volume wheel and re-solder the wires into place (be warned, this will invalidate most warranties, so if the ‘phones are still covered, just send ‘em back and get replacements).

To avoid stuff like this happening in the future, it is advisable to wrap your cables carefully and to avoid stressing your headphones. No, I don’t mean that you should give Motorhead a rest and only play floaty, soothing New-Agey music on them, I mean that you shouldn’t have them in your back pocket when you sit down and you should remove them carefully from your ears after use (this may sound obvious, but you’d be surprised how many people just rip ‘em out).

Another thing to look out for is the jack, if the cable is fraying/wearing around the jack, then that can also be a problem. Fortunately, like so many things in life, a bit of electrical tape can really come in useful, just ensure that all the copper wiring is tightly bound and it should return to normal usage in no time.

Sometimes, however, it is simply a sign that the headphones are knackered and no amount of clever tinkering can fix them. Usually, in these cases, the problem is internal. This particular variant on the problem also attacks headphones of any price range, be they Poundland specials or your year old Sennheiser Eargasm series. I’m reminded of a Shakespeare quote from Hamlet, something about a king and the guts of a beggar, but I can’t be bothered to look the whole thing up right now. You get the point I’m trying to make though, everything dies eventually, no matter how much it cost you.

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Posted November 24, 1981 by ferdinandpuckett in Uncategorized

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Chemical reaction levitated by sound   Leave a comment

My basic review of the new earpiece it starts up well, looks rather awesome, is simple to run and actually energy resourceful, the radio accessory really is a fine item. I’m glad I purchased it, read further below.

audioScientists in Switzerland have designed an acoustic levitator capable of mixing substances as they hover.

The device is built of two sound-emitting platforms that trap the substances between them.
Sound waves move upward until they are reflected by the platform above. The upward- and downward-moving waves overlap, reinforcing each other in places and cancelling out in others. This traps materials in place.

The development is described in PNAS.
The researchers managed to levitate a toothpick on their acoustic squares To demonstrate its capabilities, the researchers used it to mix a single drop of water with a single coffee grain and to bring together a minuscule grain of sodium metal with a drop of water, causing a tiny but explosive reaction.
They even managed the levitate a toothpick.
Their device though needs to use very powerful sound waves to levitate even these very small droplets and particles.

Lead researcher Daniele Foresti from the Swiss Federal Institute of Technology (ETH) in Zurich, explained that to “cancel out gravity” in this way required 160 decibels of sound (you would receive about 120 decibels in the front row of a rock concert or from a jet engine).

“That’s why we use ultrasound,” Dr Foresti said.
“[Using frequencies beyond those that human ears can detect] means we won’t hear it, so we can work with without any ear protection.”

Rocket launch Acoustic levitators were invented in the 1980s by Nasa scientists looking for ways to simulate weightlessness. But this diminutive device is the first to be able to move and control the material it levitates.
“We have total control of the acoustic field inside,” Dr Foresti said.
By making the acoustic platform of many tiny squares – each 15mm x 15mm square being its own sound-emitting device – the researchers are able to “pass” a ball of material from one of these platforms to another.

The main benefit of this remotely controlled chemical reaction is that it is contactless, meaning chemical tests could be carried out without any possibility of contamination.
“One of the tests we would like to perform is DNA transfection,” said Dr Foresti.
This is the process of introducing DNA into a cell, which is a medically useful process but one that is very sensitive to contamination.

“Some of the transfection agents [chemical substances needed to carry DNA into cells] can be rendered ineffective even by plastics,” said Dr Foresti,
“So this could be a way to overcome that problem.”

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Posted November 22, 1981 by ferdinandpuckett in Uncategorized

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