The text is written by Pavel Dudek and edited by Per-Anders Sjöström.
the PA03 is a multi-purpose power amplifier module, based on the National Semiconductor power operational amplifier LM 4780 (for more details see also http://www.ti.com/lit/gpn/lm4780). It can be used in various ways. The PA03 power amplifier module makes use of outstanding features of the LM4780 and I'll believe that you will be fully satisfied with this module. TheLM4780 consists of two LM3886 chips. More info about this can be found here.