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.

Wednesday, September 28, 2016

CultureJam DuoVibe

Here's a cool vibrato effect designed by CultureJam and based on Tim Escobedo's Wobbletron. Here's what he had to say about it his original build doc.

The DuoVibe is a two-stage optical vibe circuit than can also cop subtle phaser tones. The LFO is modified from the Shoot the Moon tremolo (itself derivative of the Tremulus Lune) and is capable of triangle wave and near-square wave output. The pitch bend in Vibe mode is discernible but not capable of “seasick” wobble. With the depth cranked, you can think of it as a sort of “tremolo with funk going on” kind of thing. There is a Vibe/Phase Mode switch, the name of which indicates its function and purpose. This switch simply toggles a feedback filtering cap value, but is useful despite the simplicity.

Monday, September 26, 2016

Catalinbread Supercharged Overdrive

Here's one of the earliest Catalinbread designs, the Supercharged Overdrive. It's a pretty unique circuit with the Contour control adding in more distortion and saturation from the CD4007 stage. Laid out for board mounted pots and will fit quite nicely in a 1590B. Schematic here for reference.

Friday, September 23, 2016

Durham Crazy Horse

For Fuzz Friday here's an really interesting circuit from Durham that's both an overdrive and a fuzz. As the name implies helps you get some Neil Young tones, but does a lot more than that. The input stage features soft clipping in the feedback loop of an opamp,  much like a Tube Screamer. The 2nd half of the opamp acts like a buffer, pushing a Fuzz Face-style stage. This then pushes another Fuzz Face-style stage that feeds into a Big Muff tone stack. The addition of the Volts control to starve the opamp of voltage makes this a really versatile pedal. I've laid this out with on board pots that will ideally fit in a 125B with top mounted jacks. Here's the schematic for reference.

Thursday, September 22, 2016

Equinox II Demo

Sorry this isn't a layout guys, but I made a quick little demo of the Equinox II reverb and wanted to share it with you all. Still really digging the sound of this thing and works really well with my smaller amps that don't have built in reverb.

A little info (maybe more than you asked for?) on the gear I used: the guitar I used started its life as a Gibson Melody Maker SG–one of those with the single bridge humbucker with the volume control and output jack on the pickguard. When I bought it the neck had a pretty substantial crack in it, so I picked it up pretty cheap. Fixed the crack and decided to turn it into a Junior with a P90 and more traditional control placement. It is very unnerving when you start routing on a USA Gibson, but it's turned into quite a player and I'm glad I took it under the knife.

Much less to say about the amp. It's a stock Vox AC4C1 in red. Got it at close out and it's a great little bedroom amp. A little boxy sounding on its own, but that's why I built this reverb!

The mic used was MXL 990 into a Zoom H4N recorder. Shot with a Canon T4i and I promise next time I do a demo I'll use better lighting!

Wednesday, September 21, 2016


Want to add tap tempo to a PT2399 delay? Using this chip from DIYSB and the layout below, you can add tap to any single PT2399 delay (Deep Blue Delay, Rebote, Faux Analog Echo, etc). The Pin 6 pad connects to the 6th pin of the PT2399, and the LED flashes at the rate of the tap.

Monday, September 19, 2016

HAO Sole Pressure

Here's HAO's take on the Distortion +/250 Preamp circuit. It uses LED clipping and features a Brilliance switch for normal, bright, and warm settings. A TL072 dual opamp is used, but on the original, only one side is used and the other is left unconnected. In this layout, I used the unused opamp for the voltage divider to give more stability there.

Friday, September 16, 2016

Way Huge Swollen Pickle Mk I

For Fuzz Friday we have the original Swollen Pickle from Way Huge Electronics. One of the unique things about this Muff clone is the use of a quad transistor array instead of 4 individual transistors. This makes for a quieter pedal and more consistency in transistor matching. However if you don't feel like tracking down an MPQ3904 or NTE2321, you can use 4 individual transistors. Just note the pinout in the layout below.