Super output opamp!!!! voodoo? - diyAudio
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Old 2nd July 2005, 10:01 AM   #1
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Default Super output opamp!!!! voodoo?

As he says in the add.

http://cgi.ebay.com.au/ws/eBayISAPI....528095204&rd=1

For your amusement

Cheers George
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Old 2nd July 2005, 12:50 PM   #2
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The idea is actually quite good and original (at least for me)

I wonder which opamp he has chosen to be repacked and sold under his name ?

Ergo
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Old 2nd July 2005, 12:58 PM   #3
SY is offline SY  United States
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Written English is not this seller's strong suit. I do admire his marketing skill- what a cool idea. I may buy a bit of copper tubing and some potting compound today...

With the right extrusion and some thermally conductive potting, this could be done for tubes. Super 12AU7 replacements, only $US150.
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Old 2nd July 2005, 02:50 PM   #4
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Where's the noise bandwidth, cmrr, psrr stats?

I would like to know how someone gets a VFB opamp with a 100MHz unity gain bandwidth using DIP8.
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Old 2nd July 2005, 03:29 PM   #5
Mr Evil is offline Mr Evil  United Kingdom
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They do look pretty cool; if I could squeeze enough discrete circuitry into a package that size I would make something like that myself (not that those are necessarily discrete rather than plain potted ICs). But as jackinnj said, all the important specifications (THD, noise, DC offset etc) are missing. Extreme speed like that (assuming those are realistic figures given) is mostly useless for audio, especially since other areas of performance have to be sacrificed to achieve it.
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Old 2nd July 2005, 04:54 PM   #6
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Is there anything in the package in addition to the DIP08? I don't see any wires from the pins going into the copper package. Seems like that copper package only is ther to hide the type/brand number.

Edit: On better looking, I guess the pins we see are not the DIL08 pins? So there could be a circuit inside?

Jan Didden
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Old 2nd July 2005, 05:21 PM   #7
SY is offline SY  United States
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A few minutes perusal of National, Analog, and LT's selection guides will turn up some candidates.
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Old 2nd July 2005, 05:42 PM   #8
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Quote:
Originally posted by SY
A few minutes perusal of National, Analog, and LT's selection guides will turn up some candidates.
Yes, you're right, there are a probably a half-dozen VFB DIP packaged dual opamps from each manufacturer that exceed 100MHz. When I think high MHz I think CFB and surface mount first.

mbe AD8056?

Of course, you could take an SOIC package and repurpose it, cover it in potting compound and sell it for 10 AUD and still make money.
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Old 2nd July 2005, 06:45 PM   #9
sam9 is offline sam9  United States
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Absolutely nothing pop up on google or yahoo. Me smells a rat!

"Fools and their money are soon parted"
-Poor Richard
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Old 3rd July 2005, 12:04 PM   #10
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Quote:
Originally posted by janneman


Edit: On better looking, I guess the pins we see are not the DIL08 pins? So there could be a circuit inside?

Jan Didden
i have like 4000 of those DIP-8 sockets and you know what for $150 /each they could be yours you know what i'm not greedy they can be yours for $1.50 each

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