Hello,
What is the typical output impedance of these famous "cheap CD/DVD players"? Obviously manuals don't say it. Thanks.
What is the typical output impedance of these famous "cheap CD/DVD players"? Obviously manuals don't say it. Thanks.
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.
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.
Most cheap CD/DVD players use 100K. Mid level and high end typicaly use between 1K to 10K.
Rascal101
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.
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.
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.
rascal101 said:
Hi Rascal
I think that you are confusing output impedance , with ideal (recommended ) minimum load impedance.
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
And whoops, most players will have an output coupling capacitor - so at DC the output impedance is infinite... hahaha...
Cheers!
Clem
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.
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.
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There is usually an op amp on the output so its likely to be less than 1k output impedance.
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