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.

Tuesday, October 17, 2017

SMD to Through-Hole Conversion

There are a lot of circuits (a lot) that use J201/2N5457 JFETs. Sadly, these components in the TO-92 package are out of production, and many of those that can be found online are either barely within spec or completely out of spec. So I thought it would be good to have a conversion board to use SMD transistors (that are current production and much more consistent) in through-hole layouts. Just solder some header pins to the holes of this board and you're good to go. I've also done a conversion board for BJTs, as some common through hole transistors are already being pulled from production.

If you don't feel like etching, you can pick these up on OshPark. On this version one side is for JFETs, and the other is for BJTs with shared through holes. I've made a pseudo-panel of 9 boards so when you order them, you'll actually get 27 conversion boards (3 panels of 9).

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Thursday, October 12, 2017

Wampler Tweed '57

Here's another (and more complicated) amp emulator, and another great design from Brian Wampler. This one stacks JFET stages much like the Cranked AC. It emulates a dirty Fender tube amp with a 3-band tone stack. I added trimmers so it's easier to bias the JFETs and it's laid out for board mounted pots in a 125B enclosure.

Tuesday, October 10, 2017

Lumpy's Tone Shop Lemon Drop/ZII/Series 7

Here's a simple little overdrive designed to emulate the old Vox 4 and 7 series amps (used by the likes of Jimmy Page and the Beatles). Pots are board mounted and it should fit in a 1590B easily. I've added a trimmer to bias the JFET at little easier. Schematic and voltages can be found here on FSB. From the manufacturer:

The 7 Series Overdrive captures the aggressive qualities of the solid state preamp found in the 4&7 series amps by using a pseudo hybrid setup consisting of a specifically selected silicon transistor for the first stage which adds a distinct bite and growl.  That pushes an FET stage into clipping adding some warmth, sustain and amp like dynamics to the tone and feel.  The end result is a highly effective emulation of the amp and a unique sonic blend that could be characterized as a "fuzzy overdrive." 

Friday, October 6, 2017

Basic Audio Scarab Deluxe

Happy Fuzz Friday! Revisiting one of the early layouts of the blog–John Lyon's Scarab Deluxe. Been meaning to draw it up with board mounted pots for a while. Ian Nelson sent me his version and with a little modification we can check that off the bucket list. Great sounding fuzz based on MicTester's Hot Silicon.

Tuesday, October 3, 2017

Mid-Fi Electronics Pitch Pirate

Here's the Pitch Pirate with board mounted pots. Like the Deluxe version, the LFO is designed to be grounded when the effect is turned on (hence the pad at the top of the board). Just use the true-bypass wiring diagram in the General Layout Notes and leave out the LED wiring. Then just connect the corresponding pads on the board to the lugs of the switch. The on/off indicator LED (pads at the top of the board) is connected to the LFO ground so that will turn on and off (and show the rate) with the LFO. It'll fit just fine in a 125B with top mounted jacks, but will also fit in a 1590B if you wire the pots off board (or maybe with long leg pots mounted to the component side? YMMV).

Thursday, September 28, 2017

GodCity Brutalist Jr

Here's a really cool distortion based on Providence Stampede and designed by Kurt Ballou of GodCity Studio. He's actually made his business card a PCB you can build this circuit on, and if you can catch them while they're in stock you totally should. But while they're sold out, you can build one using this layout. Fits in a 1590B or a 125B with top mounted jacks if you prefer.

Tuesday, September 26, 2017

EWS Little Brute Drive

Found this one on FSB and haven't seen any layouts for it, so I thought I'd give it a go. Originals are in 1590A enclosures with the Tone and Volume controls as trimmers, but I've laid them out as external controls. There seems to be some discrepancy on the taper of the gain control in the schematic, unless EWS uses a dual-gang pot with different tapers. I'd just go with a linear taper and hope for the best. Should fit just fine in a 1590B with board mounted pots.