Output impedance of cheap players

murat · 31st December 2005, 06:41 PM

Hello,

What is the typical output impedance of these famous "cheap CD/DVD players"? Obviously manuals don't say it. Thanks.

AndrewT · 1st January 2006, 07:19 AM

Hi,
output impedance commonly used is 1k0 to 2k0.
I don't know how typical this is.

You can check it by playing a test tone into two different load resistors.
The voltage difference into 100k and 10k can be used to estimate the output impedance.

rascal101 · 5th January 2006, 09:56 AM

Quote:

Hello,

What is the typical output impedance of these famous "cheap CD/DVD players"? Obviously manuals don't say it. Thanks.

Most cheap CD/DVD players use 100K. Mid level and high end typicaly use between 1K to 10K.

Rascal101

richie00boy · 5th January 2006, 10:21 AM

I don't think you will find any solid state player with a 100k ohm output impedance. I would say around 1k ohm is typical, but this can also apply to esoteric stuff as well.

sagarverma · 5th January 2006, 10:31 AM

Congli walkman(made in Korea) with recording facility,Rs 150(yes,its Rs 150):::: 13k.

Sony walkman(made in Japan),am/fm(no recording),Rs 1700:::: 15k.

both are cassete players.

cheap Chinese cdp(any cd,any format,rw too),Rs 1000.::::20k

Rs 47=$1.

PMA · 5th January 2006, 11:21 AM

Quote:

Originally posted by rascal101

Most cheap CD/DVD players use 100K. Mid level and high end typicaly use between 1K to 10K.

Rascal101

Nonsense. I have Onkyo DV-SP503E and its output impedance is 440 ohms.

Tube_Dude · 5th January 2006, 05:52 PM

Quote:

Originally posted by rascal101
Most cheap CD/DVD players use 100K. Mid level and high end typicaly use between 1K to 10K.

Hi Rascal

I think that you are confusing output impedance , with ideal (recommended ) minimum load impedance.

chicco_36 · 5th January 2006, 11:28 PM

200-1000 Ohms for any modern CDP

clem_o · 6th January 2006, 12:27 AM

Agreed. Most players will have an op-amp output followed by a resistor or two with a shunt (muting) transistor in-between. Since most op-amps will have an output impedance pretty close to a few tens of ohms, and the output Z will be pretty much dominated by the series resistor(s) placed there as part of the muting (maybe for stability too). The DV655 (pioneer) uses 200ohm resistors, so I'd reckon the output impedance is pretty close to 400 or 500 ohms.

And whoops, most players will have an output coupling capacitor - so at DC the output impedance is infinite... hahaha...

Cheers!

Clem

rascal101 · 10:34 PM

I apologize as I was referring to the resistive load being driven by the output op-amp. This is typically around 100Kohm.

Since there is a coupling cap prior to the output, I assumed that any prior load would be disregarded and just considered the 100Kohm load.

31st December 2005, 06:41 PM	#1
murat diyAudio Member Join Date: Nov 2004 Location: knoxville tn	Output impedance of cheap players Hello, What is the typical output impedance of these famous "cheap CD/DVD players"? Obviously manuals don't say it. Thanks.

1st January 2006, 07:19 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, output impedance commonly used is 1k0 to 2k0. I don't know how typical this is. You can check it by playing a test tone into two different load resistors. The voltage difference into 100k and 10k can be used to estimate the output impedance. __________________ regards Andrew T.

5th January 2006, 10:21 AM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	I don't think you will find any solid state player with a 100k ohm output impedance. I would say around 1k ohm is typical, but this can also apply to esoteric stuff as well. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

5th January 2006, 10:31 AM	#5
sagarverma diyAudio Member Join Date: Feb 2005 Location: NEW DELHI	Congli walkman(made in Korea) with recording facility,Rs 150(yes,its Rs 150):::: 13k. Sony walkman(made in Japan),am/fm(no recording),Rs 1700:::: 15k. both are cassete players. cheap Chinese cdp(any cd,any format,rw too),Rs 1000.::::20k Rs 47=$1. __________________ Never Underestimate The Bandwidth of A Station Wagon Full Of Magnetic Tapes Hurtling Down The Highway...................Andrew S Tanenbaum

31st March 2010, 10:32 PM	#10
rascal101 diyAudio Member Join Date: Jun 2005 Location: Metro Manila	I apologize as I was referring to the resistive load being driven by the output op-amp. This is typically around 100Kohm. Since there is a coupling cap prior to the output, I assumed that any prior load would be disregarded and just considered the 100Kohm load. Last edited by rascal101; 31st March 2010 at 10:34 PM.


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5th January 2006, 11:28 PM	#8
chicco_36 diyAudio Member Join Date: Sep 2004 Location: Skopje, Macedonia	200-1000 Ohms for any modern CDP

6th January 2006, 12:27 AM	#9
clem_o diyAudio Member Join Date: Jun 2005 Location: Manila	Agreed. Most players will have an op-amp output followed by a resistor or two with a shunt (muting) transistor in-between. Since most op-amps will have an output impedance pretty close to a few tens of ohms, and the output Z will be pretty much dominated by the series resistor(s) placed there as part of the muting (maybe for stability too). The DV655 (pioneer) uses 200ohm resistors, so I'd reckon the output impedance is pretty close to 400 or 500 ohms. And whoops, most players will have an output coupling capacitor - so at DC the output impedance is infinite... hahaha... Cheers! Clem

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