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.
An externally hosted image should be here but it was not working when we last tested it.
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.
2. One could use this line driver circuit as a nice class-A headphone amplifier or to drive difficult low impedance loads.
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