Upside Down...

This was the second PCB of the week. It is a waveshaper that has been lifted out of part of the Buchla Music Easel. The original PCB and stuff was done by Aaron Lanterman. There were a few issues with his original cut of the board but he does have quite an entertaining Video which is on YouTube. TekniK on the electro-music forum has done a layout that has repaied the errors and made it single sided. It is a pretty good job as there are a lot of bits on a pretty small board and only a moderate number of links. You can read about it here. You will probably notice that I managed to get the board etched upside down... again... Hence the OpAmps are hiding on the copper side! I have done some simulation with LTSpice and it is fairly typical Don Buchla with some fairly unusual design elements! Still got a bit of a way to go and I suspect that there are still some tweaks to get this going as per required...