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This stereo amplifier module provides greater than 1W of output power into a wide range of output loads (4 Ohms to 32 Ohms and higher). The circuit operates on a wide range of voltages (3VDC to 12VDC - not included). Higher supply voltages give better performance. The amplifier is suitable for battery operation due to its low standby power drain. It may be used as a headphone amplifier if additional output resistance is provided in series.
This circuit has a better low-voltage operation than K139 and a wider range of useful output impedances but the K139 amplifier output amplitude can be controlled by a DC voltage level.
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