Unique little distortion box from Bjorn. The original uses 1A1200 diodes (which are pretty big), but other (and smaller) silicon diodes can be used. Should fit nicely in a 1590B.

Instruction for build homemade Arduboy with FX

Got a request for Zakk Wylde's signature overdrive from MXR. It's essentially Boss SD-1 Super Overdrive without the buffers. Original units have MC33178P, but socket and experiment with dual op-amps. You can use right angle PCB pots to mount them on the board from the solder-side.

Today's layout is Brian's take on the PT2399-based delay. It's similar to many other PT delays, but is it's own beast. It can do anything from simple slapback delay to up to around 500 milliseconds of delay. I've laid it out for board mounted pots and it would be a snug fit, but i'll fit in a 1590B (especially if you use low profile jacks).

Here's a cool little booster from Bjorn. Fairly typical JFET boost but the way the originals are wired, when the effect is bypassed, it's buffer. This layout reflects that original wiring, so wire the In pad to the input jack, Out pad to the output jack, and use a DPDT footswitch. If want to wire it for true bypass, jumper the 2 switch pads at the top of the board and omit the 150k resistor going from lug 1 of the Boost pot to ground. Or you can wire up a SPST switch to go between buffer and boost. Lots of options with this little circuit. Works well off 18v too.

Here's another interesting take on the Tube Screamer circuit from Rockett Pedals. The input and output buffers are removed and there's an added JFET gain stage following the IC. There are also switches to select different clipping diodes and treble response.

The Folk Driver is a low-medium gain overdrive developed by SoulSonic FX after being challenged by Björn Juhl (of BJFE) to create a DIY project inspired by sound of the BJFE Honey Bee. Here's what Martin (soulsonic) had to say about it after designing the circuit back in '09: My goal was to keep the design as simple as possible, but still try to fit in some tricks. This uses both positive and negative feedback to get its sound. R8 [100k resistor between emitters] is something I learned from the big old red RCA book – it’s positive feedback to boost the gain of the first stage; it was suggested as an alternative to using cathode bypass capacitor in a tube stage, well, it works just as well with a transistor. The combination of R9+C4 [100k and 470p in series from Q1 emitter to Q2 collector] is negative feedback to reduce the high frequency gain and give the signature smooth sound. It also promotes stability in the circuit. I settled on the clipping diode combination after trying several different kinds, and the 1N4001+1N4148 combo had the best sound for this thing and reminded me most of the HB. The Timbre control adjusts both the low-frequencies and the amount of drive. At the 12 o’clock position is the minimum drive amount. At one extreme it’s max gain with lows emphasized, and the other is max gain with the lows cut. It’s sort of like having the HB’s Gain and Nature controls on one knob. Should fit in a 1590a just fine. Here's a demo:

The Faux Spring Reverb, like many pedal reverbs is based around a Belton reverb module. Originally it used the BTDR-1 (which is massive), but in this layout I've adapted it for the newer and smaller BTDR-2H. I've also simplified the power section a little, and used a TL071 for the second IC. In the original a TL072 was used, but only used half of it. Here's what Brian has to say about his design: The great thing about the Faux Spring Reverb is that it retains the Analog base tone, doesn’t send your signal through digital/analog converters and back again (wrecking your tone completely) allowing you to be as springy as you like without your sound becoming lifeless, dull and… well, bad. With the tone control, you can control your sound completely and have your reverb be as bright as day, or dark as night… As lively and bright as a small hall, or as deep as the biggest cathedrals. Edit: I realized this afternoon that the Depth pot would hit the Belton brick, so I've changed it to a 9mm pot and it will clear the brick. The whole thing will be really snug, but it should be doable.

Here's the Klon again. I wanted one with board mounted pots and for a smaller enclosure. You might be able to fit this in a 1590B with low profile jacks, but it will easily fit in a 125B. It's designed for 9mm PCB mount pots, though it might be difficult to find the dual-gang Gain pot. Look for Alpha part number RD902F-40-00. I've removed a few components that were apart of the stock bypass switching for the sake of space, so you'll want to use your true bypass method of choice with this one.

Always a fan of the MXR Distortion+/DOD 250 as you all have probably figure out by now. Here's VFE's take on the classic circuit. Bunch of extra controls and mods including soft clipping, along with bass and tone controls. Schematic here for reference.

Image 1 of 36 from gallery of The New Day Center for The Elderly / Side FX Arquitectura. Photograph by Nicolás Provoste C.

For #fuzzfriday, here's the Red Fuzz, designed by Robin Tomtlund. It's made up of 2 stages: the first is based around a single op amp with L...

Here's a well designed buffer by Martin from SoulSonic FX. Use it as a stand alone buffer or as an output buffer in another pedal. Should fi...

Since the Zakk Wylde overdrive from last week was based on the SD-1, I figured I might as well go ahead and lay that circuit out as well. This doesn't have Boss switching so you can wire it up for true bypass. I've added some extra pads around D3 if you want to change that to a germanium (which seems to be a fairly common mod to this effect).

This is a library of perfboard and single-sided PCB effect layouts for guitar and bass for pedal building enthusiasts.

Had a couple requests for this one. Very cool design and story behind this circuit. Note, the 120pF cap right below the Boost pot, and the 10uF cap just above the LED are present in the original design, but not connected. Check out Aion's trace blog for more info and schematic. Also, use the 1981 DRV drill template for this one.

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This one was kind of a sleeper. No where near as popular as MXR's Distortion +, the Distortion II was quite a bit more complicated and ran off a 15v supply, complete with a built power cord . This layout is a bit modified from the original, and can be run off a normal pedal power supply (+9/18v). Originals also tend to be very bass heavy, so I've included a few mods to tame the low end. You might be able to fit in a 1590B, but a 125B will have a bit more room.

Stumbled across this effect while looking for a completely different schematic. It's a low cost chorus designed by Merlin Blencowe (here's his schematic for reference), using a PT2399. It generates deep modulation and a very thick warble (here's a sound clip).

Got a request for this one. This was originally designed by John Hollis and has since been modified by various folks in the DIY community. Like the latest version of the Little Angel chorus, it has a switch to do either vibrato or chorus tones. And the Mode switch allows for different speeds (Leslie, Normal, and Clone). Here's the schematic for reference.

Imagen 1 de 36 de la galería de Centro de Atención Diurno del Adulto Mayor / Side FX Arquitectura. Fotografía de Nicolás Provoste C.

Merry Christmas Eve-Eve, everybody! Hope everyone has a safe and happy holiday. Here's an awesome tremolo circuit designed by DIYSB member DeadAstronaut. Cody asked me if I could do an etch-able layout since DeadAstronaut has sold out of PCBs for the effect. Check out the original thread on DIYSB for the schematic and more info. Edit 3/2/16: Added missing resistor in the filter LFO and corrected traces in trem LFO.