This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Friday, October 21, 2016

Death by Audio Robot

For Fuzz Friday, here's another wild and wacky one from DBA:

The Robot is a low fidelity 8 bit pitch transposer with absolutely no feelings what-so-ever. It is completely synthetic and transforms any input into a spuree of resynthesized robot jargon.

Originals need a dedicated power supply as the HT8950 chip runs off 2.4-4 volts and the power section of the original will not play nice daisy chained with other pedals. To make it a little more user friendly, I've altered the power supply to use a 3.3v regulator (LM1117V33C or similar, though watch the pinout). Here's my modified schematic:

Note: I've also included 4 extra pads on the PCB layout in case anyone wanted to do the mod lvlark describes here.

Wednesday, October 19, 2016

Valve Wizard Small Time

Here's Valve Wizard's take on the PT2399 delay. It's very similar to most PT2399 delays out there, with a dual op-amp providing input and output buffering. This was designed with the tails function and it uses Valve Wizard's usual J112 switching. Here's his original schematic and explanation of the circuit. You can also use a DPDT footswitch for bypassing, using one side to turn the delay on/off and the other for LED indication. I've included 2 extra pads on the PCB layout for this function. If going this route, don't populate the J112 along with the 1N4148 diode, 1k and 4.7k resistors, and 10ยต capacitor round the J112.

Monday, October 17, 2016

Walrus Audio Mayflower

Here's the Walrus Audio Mayflower, which is essentially a hybrid between the Tube Screamer and the Timmy (which has its roots in the TS already). Originals use a second dual opamp for buffering the voltage divider, which in this instance seems to just be unnecessary, so I've omitted that.

Friday, October 14, 2016

Devi Ever Vintage Fuzz Master

Here's a cool one from Devi Ever for Fuzz Friday. The Vintage Fuzz Master is only slightly different than the Soda Meiser and both can be built on the same board. The only difference is the orientation of the PNP 2N2907A transistor. I've also included 2 switches for the Chaos and Noise mods. If you don't want to include the switches, just jumper the switch pads.

Wednesday, October 12, 2016

Menatone King of the Britains

Here's a Menatone design that emulates a Marshall JCM800. Like many Menatone circuits, the King of the Britains has had several iterations over the years. For this layout I went with the 6-knob version (and is essentially the same as the Electrictabs JCM800 emulator). I've laid it out specifically for a 125B enclosure with all the pots board mounted. Here's the schematic for reference. I would have liked to included trimmers for biasing the J201s, but there just wasn't enough room. So it's probably a good idea to socket the resistors feeding the drains and reference the schematic for voltages.

Monday, October 10, 2016

BearFoot FX Baby Pink Booster

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.

Friday, October 7, 2016

HipKitty Oxblood Distortion

 Here's your Fuzz Friday fix. I'm calling it a fuzz anyway since it's just a modded Fuzz Face with an input buffer and a treble cut control at the output. It's supposed to give the boxy sound of a cranked AC15. Here's HipKitty's description:

The Oxblood Distortion was designed to emulate the tone and response of an old Vox AC15 with added gain at the input stage. Unlike other Vox-like pedals which emulate the tone and response of the Vox AC30, only the Oxblood Distortion emulates a boosted AC15.

Unique to the Oxblood Distortion is it's ability to make a "large" amp sound "small" and in hyper-drive with the tone of the AC15.

Also unique to the Oxblood Distortion is it's controlled output. While other distortion pedals use greater than unity gain at output to alter the user's amplifier input stages, the Oxblood Distortion does not. This keeps the true tone and response of the effect intact throughout the initial preamp stage of the amplifier in use.