# 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](./wha) Completely open design system for the new house built after the [Black Forest Fire](/blackforestfire.html) ## [LM1875](./lm1875) A 20 amplifier based on the National Semiconductor LM1875 that Bdale and Robert built to use playing around with an electric pickups on musical instruments.