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Old 25th April 2012, 09:35 PM   #1
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Default DIY ipod passive pre-amp?

I just saw this on the web and I find it very interesting to build it. Has anyone build something like this? Connect your Ipod to a Stereo
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Old 26th April 2012, 04:06 AM   #2
dangus is offline dangus  Canada
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Why wouldn't you just buy a 1/8" (3.5mm) stereo to RCA cable at a dollar store, or Radio Shack if you're feeling rich? A 2:1 difference in voltage output isn't much. And it's normal to have low impedance sources driving high impedance inputs. Good quality audio transformers are costly.
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Old 26th April 2012, 08:39 AM   #3
godfrey is offline godfrey  South Africa
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Whoever wrote that article doesn't have a clue about impedance and impedance matching in audioland.

Elsewhere on his site, he links to that article quite appropriately as follows:
Quote:
If your time isn't worth much, I can heartily recommend you read my other dope-propelled ramblings on the subject.
Aside from that, the output from iPads may be lower than most other modern sources, but should still be plenty high enough to drive most amps. If not, by all means use a preamplifier.
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Old 26th April 2012, 01:57 PM   #4
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Quote:
Originally Posted by godfrey View Post
Whoever wrote that article doesn't have a clue about impedance and impedance matching in audioland.

Elsewhere on his site, he links to that article quite appropriately as follows:


Aside from that, the output from iPads may be lower than most other modern sources, but should still be plenty high enough to drive most amps. If not, by all means use a preamplifier.
yeah, I was thinking the same thing. I use ipod sometimes and I have never had a problem. I am using the M400 from hdamp.com. I also drove ipod with a gainclone from Audiosector and no a problem either using just a "passive" pre-amp. When I saw this post from this guy, I was lost
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Old 26th April 2012, 04:36 PM   #5
wrankin is offline wrankin  United States
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Quote:
Originally Posted by godfrey View Post
Whoever wrote that article doesn't have a clue about impedance and impedance matching in audioland.
Or anywhere else for that matter. His use of the term "Impedience Mismatch" is categorically wrong.
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Old 30th April 2012, 03:01 PM   #6
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I am astonished by how many posts on various forums start with the phrase "I read on the internet" and then go on to repeat some ridiculous assertion that is usually generated by someone marketing something. It doesn't appear that this author is actually selling anything; he is just disseminating bogus information because he can.
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Old 30th April 2012, 03:10 PM   #7
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Yes ! The Jfet preamplifier he proposes is a 2nd harmonic enhancer !
For relieving the ear ( and the brain !) from the electronic crude sound of the mp3 player !!
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Old 30th April 2012, 05:43 PM   #8
DF96 is offline DF96  England
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Given that the author doesn't appear to understand the basics, I suppose his reference to dBU etc. is a vain attempt to sprinkle some 'techy dust' on his ramblings and impress the gullible.
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Old 30th April 2012, 07:31 PM   #9
mjurban is offline mjurban  United States
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Somewhere, somehow, this guy learned a little about the maximum power transfer theorem, and then also somehow became convinced that power transfer was important in line level audio signals. This is a classic example of a solution in search of a problem.
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Old 30th April 2012, 07:55 PM   #10
DF96 is offline DF96  England
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It is also a good example of a little knowledge being a dangerous thing.
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