Updating an Old Favorite - A Cornish-Inspired Silicon Big Muff

Before the release of the PedalPCB Polonium 2 distortion board (which I've built up as the Protoceratops 2, and which now has taken up permanent residence on my pedalboard), there was a loose consensus on the internet as to what the Cornish P-2 looked like from a schematic standpoint. I'd previously built up several hand-etched versions using the Effects Layouts PCB, and really enjoyed them. In hindsight with a clone in hand, there are several differences, and the Effects Layouts design always included the "probably" disclaimer anyway. It's therefore likely more proper to call this an "Cornish-inspired" variant, as it really is kind of its own thing.

Cloning the Cornish P-2 - For Real This Time!

Pete Cornish's effects and pedalboards have been used by a wide array of guitar luminaires including David Gilmour, Tony Iommi, Brian May, Paul McCartney, and Mark Knopfler. While some of his designs are completely original, like the CC-1 Overdrive and OC-1 Compressor, other designs are based on existing circuits, like the SS-3 (loosely based on the MXR Distortion+) and the G-2 and P-2 (both based on the Big Muff Pi circuit using germanium and silicon diodes respectively). AionFX offers many Cornish boards, and as a fan of Cornish pedals, I've built many of them including the OC-1 compressor, the SS-3, and the G-2 (both in non-dino and dino versions!). Unfortunately AionFX did not offer a board for the P-2 and after hunting around, there were no commercial boards available. The only board I could find was the Effects Layouts version, which had the "probably" disclaimer and appears to have been based some speculative circuit diagrams on the net. I'd built a few pedals using hand-etched boards, both with and without the effects layouts Cornish buffer, and had really loved the sound. I still wanted to have a faithful clone of the original, though, and with a little gentle dino-sized nudging, PedalPCB has recently released the Polonium-2 board based on a trace of the actual P-2 pedal itself.

For a Pachycephalosaurus this counts as a "gentle nudge"

Eggeaux Steggo Cornish P-2 with Bypass Clone - $135

I just finished up my second Effects Layouts P-2 with the Cornish Bypass. This one is pretty much a carbon copy of the first one I built a few weeks ago. Price is $135 which is a real steal compared to retail on the originals!

Quick News Updates and Upcoming Production Schedule

The blog has been quiet for a few days while I've been working in the background on a few items, but I wanted to take a moment and give everyone an update on a few recent topics and make a few announcements. 

First up, as I indicated earlier in the month, I entered the StG-90 in the Warmoth guitar of the month contest on their forum. Well, the results are in and... I didn't win, but I did come in a strong second out of six with over 20% of the total vote (8 votes vs. the winning entry's 11). The winning entry was submitted by a previous guitar of the month winner, and was honestly pretty dang stunning. So for my first time out, I can't say I'm disappointed in how well the guitar did.

Take the Bypass - P2 Clone - Now With Cornish Bypass

A little less than a week ago, I posted a build of the Cornish P-2 as traced and published by Effects Layouts. For that first build I used a PCB Guitar Mania 3PDT stomp switch board as I wanted to make sure that the PCB itself actually worked. That build quickly became one of my favorite pedals, so I wanted to take the next step and try it with the actual Cornish Bypass (originally traced as part of Effects Layouts G-2 project). I am hoping to offer a few of these for sale in the not so distant future, so I wanted to make sure the board worked properly with and without the Cornish Bypass.

Going Basic to Clone the Cornish P-2

Pete Cornish is a well-known pedal builder and designer out of the UK with an A-list of clients that includes the likes Brian May, Pete Townshend, and, one of my personal favorites, David Gilmour. All Cornish pedals are hand made in the UK to an extremely high standard, and are incredibly expensive. The subject of this build, the Cornish P-2, is essentially one of the ultimate evolutions of the Big Muff Pi circuit, and it runs for anywhere between $800-$1200 on Reverb depending on condition. I've seen new prices available from the Cornish website, but it is unclear how long the wait time is. As I mentioned in my entry on photoetching last month, I etched up several P-2 boards along with a couple of Cornish Bypass boards as well. I've managed to populate one board so far, and while I'm using a conventional bypass 3PDT daughterboard (from PCB Guitar Mania) for this first build I plan additional builds with the actual Cornish Bypass.

Adventures in Photoetching - or - Making Old School PCBs for Fun

At the first of the year I published an article on two new versions of the EHX Big Muff Pi effects pedal I'd completed. One was built on a home-etched board a friend had sent me using a pattern from the Effects Layouts blog. At the time I mentioned that I had done photo-etching in the past starting when I was in graduate school (getting a Ph.D. in chemistry - so applying chemistry to something guitar pedals, electronics, and music is "really cool" in my book!). Since I had some experience in the area (most recently around four years ago when I etched not one, but two sets of double-sided detail parts for 1/100th scale T-72 tanks), I decided it was time to dust off the old equipment and get cracking. This time I decided I'd try and take advantage of a few options unique to PCB etching (since I'm only doing single-sided boards!). 

Board etching in Ferric Chloride