Electronics > Beginners

why is class A audio amp saturating?

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Zero999:

--- Quote from: magic on August 18, 2019, 09:11:21 pm ---CCS is significantly more efficient.
Do the math: how much current it takes to drive 8Ω load within 1V of supply rail, what resistance is needed for that, how much current will it waste when idle.

--- End quote ---
Yes, a constant current sink is much more efficient. To swing within a half a volt of the negative rail with a resistor, would require such a low value, the quiescent power draw would be enormous. I alluded to this in a previous post.
https://www.eevblog.com/forum/beginners/why-is-class-a-audio-amp-is-saturating/msg2618517/#msg2618517

fourfathom:
OK, I agree.  I said "only somewhat", but you're right, the CC source is "much more" efficient.

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