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Keeley 4-Knob Compressor

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The Keeley 4-Knob Compressor is a modified Ross Compressor and is highly regarded in the stompbox world. It's only down side is the use of the obsolete CA3080 chip. These can be hard to find and a little pricy. However if you're unable to find one, or unwilling to pay for one, use the LM13700 chip (which is 2 3080s in one) and this conversion daughter board. The schematic can be found here. If you have a hard time getting 150k pots, use a 250k pot with a 390k resistor in parallel (between lugs 1 and 3).




555 Relay Bypass

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I know there are a bunch of you out there who like your 555 timers, so this one's for you guys. This relay bypass uses a 555 as a bistable flip-flop combined with a simple relay trigger designed by MicTester. His original design uses a latching footswitch, but with the addition of the 555, a momentary switch can be used for a soft touch bypass. MicTester says that the relay must be a Takimisawa AL5WN-K, but they are easily found on eBay and other vendors. Schematic and further discussion can be found here.

One-Knobber Project

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I haven't made a detailed project in a while, so for Fuzz Friday here's the One-Knobber. It's based on the old Dr. Tony Balls stripboard layout that covered the ColorSound One-Knob, D*A*M Meathead and Dark Meathead, and a one-knob adaptation of the '66 Vox ToneBender, and I've added the Ritual fuzz by Black Arts Toneworks.


CMAT Mods Butah

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Here's a Blues Breaker variation from CMAT Mods. Seems to be a blend of the original and second versions of the Blues Breaker. Originals use a 1N4148 for polarity protection, but a 1N5817 would be better. It's laid out for board mounted pots and will fit in a 1590G if you're into those.



Rebote Delay - 1590A

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For those of you who didn't want 1590A week to end last month, here's another mini layout for you. It's an early iteration of the Rebote Delay that features a simple JFET stage at the input, followed by the PT2399 delay stage. Simple, yet effective. Note: mind the 3 electrolytic caps on their sides in the middle of the board. Here's the schematic for reference.



MojoHand FX Iron Bell/Skreddy P19

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For Fuzz Friday, here's another Big Muff based circuit to add to the collection. The Iron Bell is a variation of the Skreddy P19, the schematic of which was graciously posted by Marc from Skreddy a few years back. It's not based on any one classic Muff, but is Marc's unique blend of custom values, and features a boosted mids tone stack, with a switch to increase the mids. Shortly thereafter, the Iron Bell came out with a few mods, the biggest of which is the replacement of the Mids switch with a potentiometer and a few value changes. The layout below reflects the MojoHand iteration of the circuit, but the P19 can be built on the same board (see below for component changes). It's laid out for board mounted pots and should fit in a 1590B.



To make the Skreddy P19, made the following changes:
  • Replace the Colour pot with an SPST on/off switch
  • Change Q2-4 to BC550
  • Change the following components indicated on the layout:
    * 200Ω
    ** 10k
    • 47nF
    •• 2.7k
    ‡ 6.8nF

Catalinbread SFT

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Here's a really versatile overdrive from Catalinbread. The SFT is based on Ampeg amps from the 70s, using JFETs to simulate tubes (like many of Catalinbread's other overdrives). The Stones/Stoner switch allows you to go from verge of breakup tones to near fuzz tones with the flip of a switch. This can be run off 18 volts and this gives extra headroom, so it may not be a bad idea to include a charge pump in your build. This layout reflects the newest version of the SFT, and the schematic can be found here.


Fulltone OCD

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I've been meaning to redo the OCD with proper board mounted pots, so here it is. It's a development on the Voodoo Labs Overdrive, with MOSFET clipping and a simple tone control. Fulltone has made a few versions of this with a few minor changes over the years. They're all mostly the same, but the biggest differences is in the pot values. Below is a partial bill of materials outlining the differences between the first 4 OCD versions, along with a couple value changes to mod the bass response.




Keeley Psi Fuzz

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Happy Fuzz Friday, everybody. The Psi Fuzz is an IC/germanium hybrid fuzz. It takes some inspiration from the IC Big Muff, but with Keeley's own distinct design touches. Schematic can be found here.



Fulltone Fulldrive 2

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I got a request for the Fulltone Bassdrive, and upon examining the schematic for it and the Fulldrive, there's only a few capacitor value changes between the two, which I'll detail below. All that to say, here's the Fulldrive 2 Mosfet. It's a Tube Screamer circuit with some interesting mods on it. Schematic is easily found on Google. Note that the Boost function of this circuit only works when the overdrive portion is already engaged. Pots can be board mounted and if the switch numbering is confusing consult the General Layout Notes tab for clarification.




For those of you who are interested in the bass version of this, use this layout to populate the Fulltone 2 board for the Bassdrive:

Lovepedal Delux 60 Mosfet Boost

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Hadn't done a boost pedal in a while and hadn't done a Lovepedal pedal in a while either, so I'm killing 2 birds with one stone. The Delux 60 uses a Mosfet gain stage set to give clean boost or to push a tube amp into break up. It's simple but effective. This'll fit into a 1590a pretty easily too.

Harmonic Percolator

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Here's the mythical Interfax Harmonic Percolator for Fuzz Friday. It's a pretty unique circuit design and uses germanium and silicon transistors. Here's the schematic for reference.


Roger Mayer Voodoo-Bass

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Got a request for this one. It's the bass version of the Voodoo distortion. It's a very popular bass effect, especially in Japan apparently, but also sounds great with guitar too. A transistor stage at the input pushes a Rat-like LM308 distortion section, followed by a Big Muff-style tone stack and a simple output buffer. Here's the schematic.


Death by Audio Fuzz War

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For Fuzz Friday, here's the original Fuzz War from Death by Audio. It's essentially 5 gain stages going into a Big Muff-esque tone stack, into a clipping stage and a final gain stage. Here's the schematic for reference. Original models have the Fuzz control as a trimmer internally, but I've laid that out as an external control for more versatility. Pots can be board mounted using right angle PCB mount pots and it should fit in a 1590B (though personally I'd put it in a 125B).


Nobels ODR-1

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Got a request for this one. It's an interesting variation of the Tube Screamer circuit, but with a lot of changes and modifications. There's an optional boost switch you can include if you like that's not apart of the original. If you don't want to include it, just don't populate the 270Ω resistor and 2.2uF connected to the Boost Switch 1 pad. Here's the schematic for reference.



Smallsound/Bigsound Mini

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Here's a pretty versatile and unique overdrive from Smallsound/Bigsound. The designer, Brian, was kind enough to share his schematic over on FSB, so a big thanks to him! I've laid this out for board mounted pots and added trimmers to help bias Q1 and Q3. I posted the layout on FSB and JohnK has already verified it, so thanks John!


Ampeg Scrambler

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It's Fuzz Friday time again, and this week I give you the Ampeg Scrambler. This one's a pretty rare one, even back when it was originally made in the late 60s. It's a pretty crazy octave fuzz with a clean blend. Originals used 2N5306 for Q1, 3, and 4, and a BC169 for Q2, but those could be difficult to source, and it works fine with modern equivalents (mind the pinouts if using original transistors). If you want to add a master volume control, use a 100k pot (adjust to taste) and wire lug 3 to the Out pad of the board. Lug 2 is now your output, and lug 1 goes to ground. This sounds pretty cool on bass as well as guitar.


JangleBox

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Here's a cool variation on the MXR DynaComp. Apparently it's well loved by Rickenbacker players for adding even more Byrd-like jangle to their tone. It's laid out for board mounted pots and you should be able to squeeze it into a 1590B.


Walrus Audio Deep Six Compressor

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Apparently it's going to be a compressor week. It came to my attention that my original schematic and layout for the Deep Six had a few errors. And since I want to build this one myself and my dislike of off board wiring, I laid this out for board mounted pots. It should be a pretty comfortable fit in a 1590BB, but if you're unlike me and don't mind playing with hookup wire, you could probably fit it in a 125B. Essentially, this is a modded Ross Compressor/DynaComp based off the BYOC 5-Knob Compressor and with a charge pump. I know a lot of you like to do charge pumps differently, so I've left that off the board so you can pick your preferred charge pump daughter board. And if you want to just run it at 9v instead of 18, that totally works as well.




And here's the updated schematic for references:

EHX Satisfaction Fuzz

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It's Fuzz Friday once again and this week we have the Satisfaction Fuzz from Electro Harmonix. It's essentially a Jordan Bosstone without the clipping diodes and a smaller output capacitor.


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