anyone know the RMS output of an ipod? - diyAudio
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Old 10th June 2008, 11:36 PM   #1
gain is offline gain  United States
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Default anyone know the RMS output of an ipod?

i suspect its around line level ~1VRMS just wondering if anyone here has ever measured it?

thank you.
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Old 11th June 2008, 12:40 AM   #2
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Old 11th June 2008, 12:44 AM   #3
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I did measure it while playing program material and i thought it peaked arround 0.2Vrms.

So probably it's a bit higher, maybe 0.5/0.7 Vrms?
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Old 11th June 2008, 01:44 AM   #4
gain is offline gain  United States
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much thanks for the info and sry for posting in wrong forum ... was thinking ipod waS made with SS componets at least.

peace
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Old 11th June 2008, 03:46 AM   #5
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Airport Express is 1.5V rms at 0dB, and I believe the analog output is identical to the iPod.
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Old 11th June 2008, 03:48 AM   #6
jcx is offline jcx  United States
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My Nano appears to regulate the internal 3.6 V Li Ion battery to 3.0 V

so it can put out a little over 1 Vrms sine

1st Gen Shuffle's are interesting lab toys since they are DC coupeld - fractional Hz waveforms, multi second ramps are possible

as for forums - this is the Digital Source Forum - hard to be more relevant to USB/flash DAC
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Old 11th June 2008, 09:48 AM   #7
sek is offline sek  Germany
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Quote:
Originally posted by zigzagflux
Airport Express is 1.5V rms at 0dB, and I believe the analog output is identical to the iPod.

Airport Express uses TI's PCM2702 or similar, the iPods differ from model to model.
Airport Express then has just a regular output filter directly connected to the (USB-) DACs output. iPods differ, yet again.
On top of that, the analogue part in Airport Express is powered with 5V (with the digital part supplied with 3.3V), iPods manage their battery power to something much lower, as jcx mentioned.

@Gain: Which iPod do you want to connect? I could try measuring one for you. Please indicate a load, i.e. input impedance of the circuit you want to drive.

PS: The current Shuffles are interesting, too. Multi-Megaherz rubbish on the output, the complete opposite of what you would expect!
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Old 11th June 2008, 11:47 AM   #8
Dxvideo is offline Dxvideo  Turkey
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As my measuring;
My iPod Photo (60G) gives 1Vpp at 0dB 1Khz fixed wav signal. From headphone output. But line out must be better (not measured yet) because when I applied the line output to my amplifier it louds too much (may be 3dB more)
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Old 11th June 2008, 02:03 PM   #9
gain is offline gain  United States
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Quote:
Originally posted by sek



@Gain: Which iPod do you want to connect? I could try measuring one for you. Please indicate a load, i.e. input impedance of the circuit you want to drive.

standard RCA line level jack. basically i want to know what the RMS (or peak) value of voltage the device puts out when plugged into a "stereo" input. in this way, i will be able to tell if im feeding my stereo with too much or too little line drive.

input impedance 20K-100K? Whatever RCA inputs are.

thanks for the many great replies.
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Old 11th June 2008, 02:09 PM   #10
gain is offline gain  United States
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Quote:
Originally posted by jcx
as for forums - this is the Digital Source Forum - hard to be more relevant to USB/flash DAC
got me there. my views are old fashioned, if it doesn't have tubes, its solid state. lol.
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