FloydCouncil
100+ Head-Fier
- Joined
- Oct 14, 2005
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I have been studying the various schematics of op-amp based audio amplifiers and I notice almost all of them include a buffer stage. Why is this so? Wikipedia states a buffer will provide a very high input impedance to the output of the op-amp and a low output impedance. How does this benefit the sound of the amplifier? As I understand it will probably allow headphones of different impedances to be used.
Secondly, is there a significant different between using a integrated buffer or a discrete one? I am considering designing an audio amplifier for my HD650 - nothing fancy, just based on OPA637. I'm an electronic engineer but I'm mostly experienced in embedded electronics than analogue.
Secondly, is there a significant different between using a integrated buffer or a discrete one? I am considering designing an audio amplifier for my HD650 - nothing fancy, just based on OPA637. I'm an electronic engineer but I'm mostly experienced in embedded electronics than analogue.