Using LME49810 to Build a High-Performance Power Amplifier –Part I:Although switching or Class-D amplifiers are gaining acceptance to audiophile community, linear amplification is still the preferred choice in the DIY world. For novices, the simplest form of power amplifier would be an op-amp followed by a current booster output stage. However, an op-amp capable of operating at high voltage, e.g. > +/- 30 V, is not common. Hence, a discrete voltage amplification stage is needed which leads to a complex circuit configuration.
LME49810 is the newest power op-amp from National Semiconductor. Similar to its predecessor, LM4702, it is a high-voltage power driver but in mono design. With this chip, constructing a high-performance power amplifier is rather simple. Compared to LM4702, the new chip has higher drive current, higher slew rate and Baker clamp. This is a good chip not only for beginners, but also for elites.