# Help!

- Site: Analog Industries
- Author: Chris Randall
- Date: 2005-12-18
- URL: https://analogindustries.com/2005/12/help/

Yesterday, during my Daily Surf, I came across a schematic for an MS-20 (Sallen-Key) filter that had been modified for 9V use as a guitar pedal. I had it in my head that it was at [hammer.ampage.org](http://ampage.org/cgi-bin/hammer/index.cgi?cmd=lt&xid=&fid=&ex=&pg=1) but I'm obviously mistaken. Does anyone here know what the fuck I'm talking about, and furthermore where the hell it is? I can't for the life of me find it again.

In other DIY news, I finished stuffing the Sound Lab Mini Synth board. For some stupid reason I accidentally ordered SMP-flavored op-amps instead of DIPs, so I need to scare up 3 of those before I can call the board officially _done._ But that said, I'm going to pick up some paint for the case tomorrow; assuming I don't pull all my hair out wiring the front panel (my least favorite part of any DIY project) this guy should be running within the next couple days.

**UPDATE:** Never mind. [Found it.](http://www.geocities.com/tpe123/folkurban/fuzz/sk.gif)