Univox Super Fuzz - tone mod

March 4, 2016, 7:05 am

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For #FuzzFriday here's the Univox Super Fuzz (again) with a modified tone stack. I'm in the middle of building this one and wanted more control over the tone than just the on/off switch of the original. This stays true to the tone of the original, but with a bit more control.

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John Hollis Ultra Flanger

March 7, 2016, 6:22 am

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Got a request for a flanger effect, and hadn't seen many layouts for the John Hollis Ultra Flanger (that didn't have tiny thin traces anyway), so I thought I'd give it a go. For the record: flangers are hard. I knew from the get go this one wouldn't fit in a 1590B, but it will fit nicely in a 1590BB. There's empty space at the top corners you can cut into to fit around the screw posts in the corners of the enclosure if you need to. Here's the schematic and here's what John had to say about the circuit:

I was originally going to develop a minimum part count version of the EH Electric Mistress. Instead I went for a something with the versatility of an MXR flanger and the extra wide sweep that the A/DA flanger was known for. It needed an extra chip to get the wide sweep but it's worth it. Current consumption is very reasonable at around 2 to 8 milliamps dependent upon clock frequency.

MXR Noise Gate

March 9, 2016, 6:28 am

≫ Next: DeadAstronaut X Fuzz

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Got a request for this one. The schematics that come up with a Google search are all wrong apparently, but it looks like the good people on FSB have figured things out. Here's a link the the discussion and the latest schematic (which this layout is based on) is on page 5. I based this layout on the original layout from MXR, using 2, single op amps. Early versions used the 741 chip, but you can use TL061 or 71s if you want.

DeadAstronaut X Fuzz

March 11, 2016, 6:00 am

≫ Next: Earthbound Audio Supercollider

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It's Fuzz Friday! Here's a cool doom-style fuzz from DeadAstronaut over on the DIYSB forum. Pretty simple and should fit in a 1590a. Schematic and a ton of discussion can be found here.

Earthbound Audio Supercollider

March 14, 2016, 6:30 am

≫ Next: Klon Centaur - True Bypass

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Happy Pi day! The day calls for at least some version of the Big Muff Pi, so here's the Supercollider. I think Cody's asked me to lay this one out like 3 times and I finally remembered to do it. haha This one follows the basic Green Russian Muff with a few component value changes. There's also been a Mids control added to the tone stack and a Mass control that pans between 2 different capacitors at the input. For the Mass control, originals use a B100k pot and a 10n capacitor off lug 2, but Kit Rae suggested using a B150k pot and a 4.7nF capacitor instead (and that's reflected in the layout). His schematic can be found here. There are versions of this pedal out there that include a switch for silicon or LED diodes. I'm assuming that much like the Pharaoh, this option is for the diodes in the 2nd gain stage (1N4001s in the layout below). If you want the clipping switch it won't be hard to wire that off board.

Klon Centaur - True Bypass

March 16, 2016, 6:30 am

≫ Next: Cornish Buffer

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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.

Cornish Buffer

March 18, 2016, 6:13 am

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Got a request for the Pete Cornish Buffer in dual form like the one I did with the Klon Buffer. So here's both a single and a dual Cornish Buffer. The original uses a 1N5401 for polarity protection, but a 4001 or similar will work too. And you can probably get away with a small value on the power filter cap (220µ).

JHS Honeycomb Deluxe

March 21, 2016, 6:19 am

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Here's JHS' Honeycomb Deluxe tremolo. Or something close to it anyway. It's a modified EA Tremolo with an extra switch to control speed and a extra footswitch to switch between speed controls. Ian McDermott came up with a work-a-like for it, so this layout follows his schematic. This layout features board mounted pots and because of the 2nd footswitch I've laid it out for a 1590BB enclosure. Also this is laid out for film box caps like these, though others will work just fine.

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Mad Professor Stone Grey Distortion

March 23, 2016, 6:00 am

≫ Next: Zvex Fat Fuzz Factory

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Here's the Stone Grey Distortion from Mad Professor. It's reminiscent of the Distortion +/OD250 circuit, but with a hex inverter stuck after the opamp. It also uses 2 JFETs in the feedback loop of the opamp for clipping. Original op amp is the TL051, but other single opamps can be used (Tl061, 71, etc). Should be an easy fit in a 1590B. Mind the jumper under the CB4069UBE.

Zvex Fat Fuzz Factory

March 25, 2016, 6:13 am

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For Fuzz Friday, here's a layout for the Fat Fuzz Factory in a 1590B in a more traditional orientation. All pots are board mounted as well as the Fat Switch. For C1 and C2 you'll probably want to experiment with values. Using an on/off/on switch gives you an extra option over the original. 3.3uF is a good place to start with one of them. Just a note, whatever value you chose will be in parallel with the existing 100nF cap. Thanks to p0mp0 for sending in his layout.

Death by Audio Evil Filter

March 28, 2016, 5:55 am

≫ Next: Wampler Faux Spring Reverb

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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.

Wampler Faux Spring Reverb

March 30, 2016, 6:28 am

≫ Next: Keeley Fuzz Head

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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.

Keeley Fuzz Head

April 1, 2016, 6:30 am

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Over a decade ago Robert Keeley was kind enough to share this design with the DIY community. It's a fairly unique fuzz, with a germanium treble booster at the beginning, a differential amplifier in the middle, and a basic buffer at the output (this is so it will play nice with other effects). Robert's full explanation of the circuit can be found here, however note that the schematic in that document isn't what I used. I used this later one with a tone control, and ended up laying it out with all controls externally. The PreGain control originally was a trimmer because it has a tendency to crackle when turned, but for ultimate tweak-ability I moved it externally.

The switch is a SPST on/off, by the way.

DeadAstronaut Bassman Preamp

April 4, 2016, 6:10 am

≫ Next: CultureJam Box of Hall

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Here's one for my fellow bassists out there. It's a transistor-ized version of the Fender Bassman preamp as modified by DeadAstronaut over on DIYSB. It's laid out for board mounted pots and switch and will fit nicely in a 1590B.

CultureJam Box of Hall

April 6, 2016, 6:02 am

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Here's a great sounding reverb designed by CultureJam, built around the typical Belton BTDR-2 reverb brick. I've laid it out for onboard pots and the BTDR-2 being mounted from the solder-side of the board.

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Schaller Fuzz

April 8, 2016, 6:19 am

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For Fuzz Friday I give you a fun little circuit built in West Germany in the late 60s and early 70s–the Schaller Fuzz. It's a silicon Fuzz Face variant and sounds rather good. Originals used BC109B and 239B transistors, but modern equivalents would be BC549B or 550B. It's laid out for onboard pots, but if you feel like using hookup wire, you could probably fit it in a 1590a. Schematic can be found here.

Wampler Faux Analog Echo

April 11, 2016, 6:13 am

≫ Next: BearFoot FX Blueberry Bass Overdrive

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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).

BearFoot FX Blueberry Bass Overdrive

April 13, 2016, 6:35 am

≫ Next: Austone Textone Fuzz Nutz

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Being primarily a bass player myself, I've wanted to build this one for a while, but didn't really feel like messing with all the off board wiring of my first layout of this circuit. So I've drawn up a new layout with board mounted pots. I've also subbed a 2N5457 in place of the stock 2N5952 because it's what I have in my personal stock and I order from parts suppliers enough already (haha). If you do use a 5952, mind the pinout as it's SGD, whereas the 5457 is GSD.

Austone Textone Fuzz Nutz

April 15, 2016, 6:09 am

≫ Next: Buffered Bypass

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Here's a cool circuit for Fuzz Friday. It's supposed used by Billy Gibbons from time to time and it's a silicon Tone Bender of sorts. It uses 2SC1815Y transistors that have a gain range of 120-240 hfe. Other transistors can probably be used, but mind the BCE pinout.

Buffered Bypass

April 18, 2016, 6:34 am

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Prepare for a bit of rambling: I was looking through the de-goup thread for the Cornish G2 over on Freestompboxes.org and was intrigued by the buffered bypass switching that's used on that pedal. (Before people bombard me with requests for the G2, don't worry it's coming.) Original G2s have individual PCBs for the footswitch, the bypass buffer, and the effect. Surely the first 2 can be combined, right? So I drew up the Cornish buffer with a board mounted footswitch (which I will share when I post the G2 layout), but it was too big to fit in a typical 1590B with the footswitch centered in the enclosure. Then I got to thinking about replacing the buffer circuit with one that took up less space. So I drew it up with the input buffer from the Klon and it will fit very nicely in a 1590B. This uses a board-mounted DPDT footswitch (I bought a bunch from Tayda a while back) and the on/off indicator LED can be mounted to the board as well.

I verified this over the weekend and here's a few pics of my build.