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Old 23rd May 2007, 06:47 AM   #1
Dxvideo is offline Dxvideo  Turkey
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Default iPod's line level output?

Does anybody know that the iPods line level output is how much volts in eff?
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Old 25th May 2007, 07:05 PM   #2
Nordic is offline Nordic  South Africa
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I think 1V into 32 ohms for the ipod shuffle... guess the rest of them won't be much more...
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Old 26th May 2007, 07:51 AM   #3
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No no. I meant the dock line level output..
However the earphone output is not as you mentioned. I read 300mV with a true RMS avometer. (with 1Khz 0dB AIFF)
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Old 26th May 2007, 10:36 AM   #4
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Quote:
Originally posted by Dxvideo
I read 300mV with a true RMS avometer. (with 1Khz 0dB AIFF)
Wow, that's low. I'm surprised.
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Old 26th May 2007, 10:55 AM   #5
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I was also surprised.

I heard "1V level" in many forums. However when I plug my gainclone to iPod's earphone output, I face that the level was very very low. I coulnt get even half of a CD players level from him. Then I downloaded a AIFF test signal from web then saw the bitter result!

By the way, last night I had a chance to measure the line level output from the dock 30 pin connector. It was really 1V!
I guess the 1V story is from this point. But in other hand my CD players output level is still 2V. So when using them together by selecting inputz then 3dB difference will occour.

And another obvservation; my iPods line outputs are very noisy. I can hear hdd start stop buzz very clearly at 20cm distance from my speakers even the volume level is very low. (while using with gainclone). However I couldnt hear that noise from earphone ouput at the same configuration...

Now whats that? Does anybody know why this happen?
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Old 26th May 2007, 11:08 AM   #6
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Can't help with why.. but some solutions

Increase gain of buffer, or drop CD output voltage with series resistor... or maybe both...
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Old 26th May 2007, 11:21 AM   #7
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The problem is I have no buffer on my gainclone. I have only an input selector and a potentiometer. Its a nude one.
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Old 26th May 2007, 11:40 AM   #8
Nordic is offline Nordic  South Africa
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Absolutely worth spending an hour on... I recommend the Pedja Rogic buffer, you can find in the solidstate section... its basicaly 3 transistors, a few caps and resistors and a little PSU...

it is a HUUUUUUGE diffirence...and step up...
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Old 26th May 2007, 02:38 PM   #9
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But I already putted it to an enclosure. And I am not very experienced on mechanical things. I spent 2 days for just "enclosuring". Now you say put a buffer to the input.
Too much for me. I prefer to adjust volume pot while changing the channels.
Thx.
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Old 26th May 2007, 02:41 PM   #10
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You mean that?
http://www.pedjarogic.com/gc/index.html
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File Type: gif gc_buffered_sch.gif (3.6 KB, 196 views)
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