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Grab & GoGo Delay/Overdrive

April 20, 2016, 6:23 am
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Here's a cool little dual effect designed by Allesz over on FSB. I actually laid this out a long time ago, but couldn't wrap my head around the switching with the buffer. I've learned a lot since then and feel confident in my understanding to publish this one here. It essentially is a basic PT2399 delay with 2 of the pins from the PT2399 being used as a separate soft clipping overdrive. A simple buffer, built around the MPSA13, is always on, making this a non-true bypass effect. But a little buffering never hurt anyone ;) The original schematic and discussion can be found here.


Since there's a lot of off board wiring going on with this one, here's a full off board wiring diagram to help clarify.

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Cornish G-2

April 22, 2016, 6:08 am
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Happy Fuzz Friday, everyone! As promised, here's my layout for the Pete Cornish G-2. The circuit is essentially a Big Muff (with a few different component values) with a simplified tone stack and input buffers. It's not quite as fuzzy or distorted as a typical BMP but more of a heavy overdrive. Though it can get fuzzy at higher Sustain levels. There is a bit of uncertainty over the type of diodes used in the clipping stages, so socketing is a good idea here. 1N34s or 1N60s are a good place to start.



As I mentioned earlier this week, I've also laid out the bypass buffer with a board mounted footswitch. It's a little too wide for a 1590B, but this and main circuit layout will fit very nicely in a 125B enclosure. 



If you're building on perf and want to include the bypass buffer of the original you can use the Cornish Buffer layout and wire it like this:

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Cornish SS-2

April 25, 2016, 6:30 am
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With the G-2 fresh in our minds, I thought I'd draw up the SS-2 as well. This is set up for a 125B like the G-2 due to the footswitch board. The circuit itself is like an MXR Distortion + with a tone control and a gain recovery stage. Originals utilize 2, LM741 chips, but I've drawn it up for a LM1458 (which is a dual version of the 741) to make things a little easier and save space.



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Blackout Effectors Mantra Overdrive

April 27, 2016, 6:24 am
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Here's a great sounding overdrive from Blackout Effectors. It features a 2-band EQ and the standard drive and volume controls. The topology of the circuit is reminiscent of the classic Big Muff, (input amplifier, gain stage, gain stage, EQ, gan recovery stage) but the components are completely different. Here's the schematic for reference. Adjust the trimmers to around 6.2v, then fine tune by ear if necessary.


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Fuzz Jade

April 29, 2016, 6:30 am
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Happy Fuzz Friday, everyone. Today's layout is a cool variation of the Fuzz Face circuit, but with the addition of a Big Muff tone stack and a gain recovery stage. There's also a Mud pot that starves Q3 for extra tweaking. Board mounted pots and 1590B friendly. Here's the schematic for reference.



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Soft-Latch Relay Switching

May 2, 2016, 6:30 am
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Switching an effect on and off can be as simple or as complicated as you can make it. 3PDTs are pretty much the standard these days for true-bypass switching. However most of the 3PDT footswitches I've used make a lot of noise (not necessarily in the circuit, it's just loud when you step on them) and while that's not really the end of the world, it'd be nice to avoid the loud "KATHUNK" of the 3PDT. Relay switching fits that bill rather nicely, and there are lots of different ways to trigger the relay, some more complicated than others.

In my search for one that was fairly simple and wouldn't take up too much room in a pedal, I came across this article from a few years back by Paul in the Lab. It uses just 3 transistors, a momentary switch, and a DPCO-type relay. I've drawn his circuit up for use with a board mounted SPST momentary off/on footswitch (if you need a perf layout, check out this one over on lvlark's blog). You'll need a 9 volt Omron G6SU-2 relay (I got mine from Mouser), and a lot of different transistors can be used. BC547 and 557s are called for in Paul's schematic, but 2N3904 and 3906s or similar can be used as well. Most SPST momentary switches I found had the solder lugs on the side, so the board has been laid out to fit vertically in a pedal enclosure. Everything is mounted to the circuit board on the component side and the board is small enough to fit in a 1590B.




Here's how the switch should mount to the board.

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Keeley Katana

May 4, 2016, 6:01 am
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The Katana is a highly regarded clean boost pedal that can give a nice clean boost or push your tube amp into breakup. The circuit itself is fairly simple, but achieves extra headroom thanks to the internal voltage doubler. For this you can use a ICL7660 or MAX1044. You may want to socket the two 4.7k resistors or replace them with 10k trimpots. The drain of both transistors need to be around 9 volts. On original units, the switch is a push/pull on the pot (which is why it's mounted to the side of the enclosure), but a regular toggle can be used. If the switch wiring doesn't make sense, reference the General Layout Notes tab for switch numbering. It should be possible to fit this in a 1590A if you're not claustrophobic. Here's the schematic for reference.



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D*A*M Ezekiel 25:17

May 6, 2016, 6:12 am
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Here's a non-Fuzz Face/Tone Bender offering from D*A*M for Fuzz Friday. It's designed for bass, but sound great on guitar as well. It uses one half of a dual op amp to blend in clean signal, and the other half creates the distortion via soft clipping. You have 4 options for clipping diodes, germanium, silicon, LEDs, and bypass, selectable via a rotary switch. The rotary will have to be wired offboard, but the rest of the pots are board mounted.




Drew up the schematic too for reference:

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Emerson Customs Paramount

May 9, 2016, 6:37 am
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This is Emerson's second offering. Essentially it's an Electra Distortion without the clipping diodes and it's pretty similar to the EM Drive. It adds a tone control that pans between 2 capacitors at the input. It's laid out for board mounted pots and will fit nice in a 1590B.


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ProTone Dead Horse Overdrive

May 11, 2016, 6:17 am
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I actually own one of these from the Dead Pony run, and the other night when I'd run out of solder I traced it. It's essentially a TS-808 clone with a couple of very minor changes. There was a jumper where an extra diode could be for asymmetrical clipping, so I've included room for the extra diode in the layout. Couldn't read the exact type of diodes, but they looked like 1N4148s. Use your favorites or socket and experiment. Also a lot of the capacitors were axial ceramic types, so the below layout reflects that. Here's the schematic I drew up.




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Valve Wizard Flanger

May 13, 2016, 6:44 am
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Mixing it up and doing Flanger Friday this week. Got a request for this circuit designed by Valve Wizard. It's unique in that it uses 2, PT2399 delay chips paired with an LFO. It features a buffered bypass, so it's not a true-bypass effect. I've also drawn up daughter boards for the bypass switching (PCB version has the footswitch board mounted). Here's the schematic for reference. You'll definitely need a 1590BB enclosure for this one.


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Crazy Tubes Ziggy Overdrive

May 16, 2016, 6:30 am
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Here's a cool MOSFET-based overdrive from Crazy Tubes. Apparently it's based on a Neve console input channel stacked 3 times. With the gain down it sounds a bit like an AC30, and with it cranked it sounds like a Plexi. It was traced over on FSB (link here) and I've laid it out for board mounted pots.



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Run Off Groove Big Daddy/Grace

May 18, 2016, 6:38 am
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Here are two great sounding, yet simple circuits from Run Off Groove. The Big Daddy uses a JFET gain stage to push a 386 chip, while the Grace uses a JFET buffer in front of the 386 for added sparkle. Parts-wise, there's not a lot different between the two, so I've only drawn up one board. Schematics, sound clips, and more info can be found on the ROG site.


To populate the board for the Grace, omit the 2.2uF capacitor, jumper the 15k resistor, and replace the 2.2k resistor with a 15k one. See below:

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BearFoot FX Arctic White Fuzz

May 20, 2016, 6:26 am
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Fuzz Friday is once again upon us, so here's the BearFoot FX (BJFE) Arctic White Fuzz. It's probably based on Tim Escobedo's JFET variations of the Fuzz Face, but with a lot modification. It's set up for board mounted pots and will easily fit in a 1590B enclosure.


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Ibanez TS808 Tube Screamer - 1590A

May 23, 2016, 6:08 am
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I've had a couple requests for a 1590A friendly Tube Screamer, and lately I've really been enjoying laying out 1590A boards, so here it is. Since there's 3 potentiometers, you'll need to use 9mm pots, and the 3PDT footswitch is board mounted. I would suggest using small profile jacks for this like these, or just measure really carefully when drilling the enclosure. Note that the 100uF power filter capacitor is folded on it's side for space purposes.

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Fairfield Barbershop - 1590A

May 25, 2016, 6:16 am
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Continuing on with my 1590A kick, here's one for the Barbershop Overdrive from Fairfield Circuitry. I've modified a few things: first, the polarity protection of the original is a bit excessive, so that's been simplified. And secondly, I included 2 trimmers to help set the bias of the J201s (you're welcome, Cody). With 3 pots you'll need to use 9mm pots and the 220uF cap is on it side to fit better in the enclosure and hopefully not get in the way of the input jack. Drilling template can be found here.


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Electro Harmonix Big Muff - 1590a

May 27, 2016, 6:16 am
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Let's wrap up this 1590a week with one of the mightiest fuzzes of all time–the Big Muff. For this one, I've labeled all the components to correspond with the component names on Kit Rae schematics, so find an EHX version on there and populate the board accordingly. This probably won't work for some of the more modified, non-EHX Muffs, just fair warning. Polarity protection and power filtering have been added, as has a pull down resistor at in put. It's labeled as "PDR" on the layout and would typically be 1-2M. The resistor labeled "CLR" is the current limiting resistor for the LED, and can be anything from 2.2k to 10k.

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Four Step Atari Punk Console

May 30, 2016, 6:00 am
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I thought I'd mix things up a little this week and post some synth circuits people might be interested in. To start things out, here's a modified version of the classic Atari Punk Console. This has a few additional potentiometers for more control and a more versatile version of this popular synth.


In the layout below note that VR stands for variable resistor as the schematic I laid this out from didn't have names for each control (there are 6, labeled A through F).



Pardon all the jumpers, 555s are uncooperative for single sided layouts. Haha
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Devil's Triangle Drone

June 1, 2016, 6:28 am
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Here's a synth circuit from Paul in the Lab (schematic and sound samples can be found over there). I've laid it out for board mounted pots with the board vertically in the enclosure. See the drilling template in the library for a visual. Here's what Paul had to say about it:

This is a project based largely on the put up or shut up mentality, for quite some time I've been getting annoyed at seeing youtube videos of people pissing about with these "synths" which are basically boxes of 555 timers with a million knobs that make stupid noises that you couldn't ever actually use in music so I thought I would make my own little synth that would get repeatable sounds and be useful in music and what better type of synth? a droner type - basically cause I love bagpipes - I like drones.

Anyway the circuit itself is quite a simple one basically because I only designed it during the week, all it is really is 3 triangle wave generators configured to operate in the audio range going into a mixer op-amp configuration with the odd filter here and there to soften the waveforms
I've used LM358 op-amps cause they are the cheapest, I'm not too sure if others would work in the same way though they probably will.

Why call it the devils triangle - well it has 3 oscillators one of which can oscillate a slightly high pitch range (for melody) it also sounds demonic so the name fit.


If you want to implement on/off switches for each oscillator, replace these jumpers with on/off switches.


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Galactic Fissure

June 3, 2016, 6:22 am
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I thought I'd close out Synth week with a fuzz designed specifically for synths. (Fuzz Friday waits for no man!) This one is pretty straight forward and I don't have much to say about it. Schematic can be found here. I added a pull down resistor to the input in case some one builds it for guitar, as well as polarity protection and power filtering.

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