This amp can be driven by a CD or MP3 player, and can drive a good high fidelity headset of about 32 ohms, and as high as 600 ohms and beyond. Some high-end audio folks consider integrated circuit operational amplifiers not to be very good ... something about too many transistors in the signal path. This circuit uses all discrete components — no more and no less than required to provide wide bandwidth and low distortion.
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