LME 49720 questions
This segment is from the LME 49720 data sheet.
I have a couple questions:
1. On the left, the "panning" circuit. Shouldn't the plus/minus of one of those amps be reversed? Won't Vo1 and Vo2 be out-of-phase? And if so, which one? Are they using positive feedback or negative feedback?
2. On the right, the "line driver": The 49720 can sink or source 26ma. I would think that would be plenty enough for any line driver. Why the need for the additional buffer circuitry?
Thanks all. Inquiering minds want to know. :)
1. The plus/minus should be reversed on the lower half of the LME 49720. Both opamps should be connected with inverting configuration. Relative attenuation is defined by the ratio of R1/(potentiometer value to ground).
2. One could use this line driver circuit as a nice class-A headphone amplifier or to drive difficult low impedance loads.
Thanks gagnou. So, it wasn't just me.
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