Ripthorn FET-2B Bass Preamp

DIYStompboxes forum member Ripthorn adapted the Alembic F-2B tube preamp to a JFET preamp. It gives you 3-band EQ controls, master volume, and a bright switch. Fairly simple circuit, but might turn into a bit of a rats nest with the offboard wiring (I know, a bit out of character for me). Set the trimmers to about 4.5-5v and then adjust from there to taste.

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.

EHX Big Muff - Green Russian

With the exception of the IC BMP ('77, '78) you can theoretically build just about any version of the Big Muff on any other version's layouts, but the values listed in this one are for the Tall Font Green Russian version. This one is smaller than the BMP layout I did with on board pots and you should be able to fit it in a 1590B if you shave down the sides of the board a little.

One of the better sounding versions of the Big Muff (IMHO anyway) and sounds great on both guitar and bass.

And if you want to cut through the mix a little better, here's the Green Russian with a modified tone stack, adding a mids control. Pinkjimiphoton over on FSB suggests using a higher value pot for the mids control (250k-1M) than the normal 100k that's listed. 

Update 3/16/15:

Modeffected pointed out that these 2 layouts were missing the 12k resistor from the power rail to the collector of Q3. Both layouts have been updated and should be correct now.

Bikini Wax

Nocentelli's Bikini Wax is a shaved down Big Muff with the tone control and gain recovery stage removed. Play around with transistors and especially diodes to change the tone to your liking.

Update 3/16/15:
Since the layouts for the Green Russian Big Muff were derived from this one, and the Green Russian was missing a resistor from the power rail to the collector of Q3, I figured this one might be lacking that resistor as well. Sure enough, there was no 10k resistor where it should be. Updated the layout and should be good to go now.

Vox Repeat Percussion Tremolo

This cool little effect was originally housed in a small box that plugged directly into your amp (which you then plugged your guitar into) and later on some of Vox's higher end guitars. You'll need to track down an obsolete 2N2646 unijunction transistor for Q1, but they can be found on eBay or Small Bear. It produces a thumpy sounding tremolo that could be really useful if you're trying to cover The Who's "Baba O'Riley" and need to do the intro on guitar.

Here's the stock version:

And with an added depth control:

Jordan BossTone

This one was a request. It's another layout for Jordan BossTone, but with onboard pots. Because of the onboard pots I was able to add an anti-popping pull down resistor on the input. Q1 is NPN silicon (so 2N2222 or 2N3904) and Q2 is PNP silicon (2N2907 or 2N3906). The pot centers are 1.2 inches (≈ 3cm) apart. You can use this same layout for the EHX Satisfaction fuzz by leaving out the clipping diodes (1N4148s).

MOD The Verb Deluxe

Here's another MOD effect. It's a simple reverb using the Belton Digi-Log Mini Reverb Module (the BTDR-2H-L), which you can mount directly to the board. The DPDT switch referenced in the layout is the on/off stomp switch if anyone is confused by that. Here's the schematic and a sound sample for reference.