A hundred of ohms seems to be a typical output impedance for a cd player, but why?
Isn't a low output impedance better?
And this impedance isn't even due to the I/V itself, but by adding series resistors in the signal. Wha'ts the need for this?
Isn't a low output impedance better?
And this impedance isn't even due to the I/V itself, but by adding series resistors in the signal. Wha'ts the need for this?
CDP output stages almost always use feedback. Such stages are usually not stable on the capacitive loads. Series resistor decouples this load. Other than this resistor, output impedance is often notably under 1 Ohm. In the absolute terms, output impedance is not in any specific relation with the sound qualities.
Pedja
Pedja
Depends on the actual opamp used. Some could drive a few nF, some will have problems even with a 10pF (mainly current feedback ones). Datasheets usually offer good info about this.
Pedja
Pedja
It also protects the op-amp....for preventing them shortcircuit if output-wires become damaged...
Arne K
Arne K
Bricolo said:
But a hundred ohms output inpedance...is a low output impedance!!!😉
Specialy feeding a pre amp or a power amp.
Yes, this might be the reason as well, though the opamps without short circuit current limiting are rather scarce these days.Cobra2 said:
Pedja
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