Improved distortion levels and more power.
Input impedance - 33K
Output impedance - 16ohm/32ohm
Voltage gain - 5.5
Current gain - 2062/1031
Output power - 100mW@16ohm/50mW@32ohm/
Power draw - 320mW/16ohm 160mW/32ohm
Efficiency - 30%
Power source recommendation - 2x3.7V 500mAh should last you ~16hours before needing to recharge it. Stereo version will get you 8hours play time due to the need of a second amplifier (I recommend adding a stereo to mono mixer instead) Estimated size of full stereo construction is no wider than a credit card and no higher than a match box. Heatsinks for the power transistors won't be necessary since they will dissipate no more than 300mW.
