# Audio Projects This is an amplifier based on a National Semiconductor LM1875 that Bdale and Robert built to use playing around with an electric pickup on Bdale's violin. The ultimate objective is to have a modest effects chain with amp and speaker that Robert can use when playing music with his friends. We chose to start by building a high-quality amplifier. ## [Whole House Audio System](./wholehouse/) Completely open design system for the new house built after the [Black Forest Fire](/blackforestfire.html) ## [20 watt amplifier](./lm1875.html) A 20 watt mono amplifier based on the National Semiconductor LM1875 that Bdale and Robert built to play around with electric pickups on musical instruments.