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Wire with gain

post #1 of 7
1/26/11 at 9:35pm
Thread Starter 

Alright, who wants to bite the bullet on this one?  Class A, only $47 with free shipping all the way from Greece.  Be sure to read the disclosure on the bottom.

 

http://cgi.ebay.com/Headphone-Amplifier-Class-no-passive-components-HD580-/330521152484?pt=LH_DefaultDomain_0&hash=item4cf4988be4

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post #2 of 7
1/27/11 at 9:47am

I would be interested to see what is hidden in those TRS plugs, but from the sound of that disclaimer publishing a schematic on a public forum would be going against the seller's wishes

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post #3 of 7
1/27/11 at 12:45pm

I'm sure it sucks, and is a marketing gimmick.

 

Definitely some sort of an opamp with fixed gain built in.  No capacitors, so power will fluctuate depending on load.  Probably a rail splitter, with the opamp.  It's probably something like the TDA7233, which has a fixed gain of 39dB, but something more headphone friendly.

 

bleh, pass, it sucks, no need to even bother discussing it.

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post #4 of 7
1/27/11 at 2:13pm

Absolutely never!

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post #5 of 7
1/27/11 at 5:48pm
Thread Starter 

Somehow I remember seeing something like this years ago.  Could be from Popular Mechanics/Science adds and this guy bought the plans.  Come on people, someone's cat has to killed for my curiosity.

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post #6 of 7
1/27/11 at 6:06pm
This is the same dude who tried to sell a tube version of the same scam a while back:

http://www.head-fi.org/forum/thread/510064/possibly-the-best-tube-headphone-amplifier-in-the-world

At least his prices have come down. tongue.gif

Gotta admit, he is persistent. Wonder how many he has sold. Looking at his other items for sale, my main question is, who buys a picture of feet for $47USD???
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post #7 of 7
1/27/11 at 6:47pm
Thread Starter 

Ha ha, looks like the same guy alright.

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