Death by Audio Sound Saw

Not quite a Fuzz Friday, but a Filter Friday I guess. Goes hand in hand with some fuzz though. The Sound Saw has two different passive filters selected by the Channel footswitch. The filters then share a 2-transistor gain recovery stage. Here's the schematic for reference. You can use a common cathode LED for the Channel switch or 2 individual LEDs if you prefer. See wiring diagram below. Laid this out for a 125B, but should be easy enough to adapt for 1590BB if you prefer. Will probably be doing a fabricated version of this in the near future as well.

Sound sample:

Hyper Fuzz regular and then the Sound Saw comes on

Clean guitar into Sound Saw changing tones

Bass Guitar into Suppa Tone Bender into Sound Saw

Bass Guitar into Big Muff then Sound Saw

Bass Filter Pedal

Here's a cool little bass filter pedal designed by bleepboxes. Really low parts count should make for a pretty quick build. Original info here. Might be a good idea to put the 4.7n cap on a switch with a 2.2n for more tonal variation.

Run Off Groove Nurse Quacky

Here's Run Off Groove's take on the Dr. Q by JD Sleep with mods and improvements suggested by Mark Hammer and Jack Orman. More info, schematic and sound clips here.

Death by Audio Kill Kill Filter

It's a Fuzz and Filter Friday! Here's DBA's Kill Kill Filter. At it's heart is a stripped down Big Muff (only one distortion section without clipping diodes) with a footswitch selecting 2 different pots in the tone stack. Schematic can be found over on FSB.

Korg MS-20 Filter

Switching it up this week and doing a Filter Friday. This one could be used for both synth and guitar/bass. It's a cool filter effect based around the LM13600/13700.

Death by Audio Evil Filter

Here's an unreleased version of the Evil Filter. It's similar but not quite the same as the original. The schematic was pulled from a video interviewing DBA's Oliver Ackermann and was redrawn here. Some of the parts are a little pricey but the resulting sound is apparently amazing.

Seamoon Funk Machine

The Funk Machine is a filter effect that can be used on either bass or guitar (or synth, Rhodes, harmonica, etc). It's also like an auto wah, given that the wah effect is controlled by the string attack of the player. Original units used 2, LM741 chips, but I've laid it out for an LM1458 (which is 2, 741 in a dual op amp). Don't try to use a TL072 or JRC4558, as they will not work in the circuit. Check out the discussion of this circuit over on Tagboard Effects for more info.

DOD FX25 Envelope Filter

The FX25 was initially produced by DOD in the early 80s and is an OTA-based envelope filter/auto-wah. It's a fairly tweakable and you can find various mods on other sites, but this is for the stock layout. The original switching circuitry has been removed, so you can use true-bypass. An LM1458 is listed in the layout below, but just about any dual op-amp should work there (TL072, NE5532, JRC4558, etc.), so if you get a little distortion, try a different op-amp.

Update Aug. 10, 2016:

I've fixed the layout as per NapAlpha and Eduardo's comments below. Thanks for catching that guys. Sorry it took me so long to make the fix.

AMZ Dr. Quack

The Dr. Quack is Jack Orman's improvement on the EHX Dr. Q envelope filter. Basically, there's an added input buffer to increase the input impedance (which is kinda low in the Dr. Q) and offers better range control. Check out Jack's blog post on the circuit for more information and a few mods.

Pearl/Vorg Warp Sound

Here's a rare one that came in via the request folder. It's a distortion/filter effect. Used live by guitarist Kevin Sheilds from My Bloody Valentine on "Sometimes," this might be a must-build for shoegazer fans out there.

Here's a demo video of a clone with the 100k trim pot wired externally as a distortion control (which might be a good mod to this circuit.

Not a true-bypass effect–removing the buffer is next to impossible. You can use a SPDT or if you want a LED on/off indicator, use a DPDT.