Pete Cornish - Mystery Pedal [gooped][x-ray'd]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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Seiche
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Post by Seiche »

:lol:

so Aion posted two pictures of an "original design" cornish pedal, one a gooped gutshot and the madlad actually apparently x-rayed the PCB lol. Not anymore info though.
61749044_2910345512524136_6475953561514541056_n.jpg
62134939_2910358669189487_6646846680975015936_n.jpg
I wonder what it actually is. I can see one or two opamps and two transistors, as well as a trimpot.

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Post by aionios »

I'll let you guys speculate for awhile... but tracing is complete on my end and a PCB (including schematic and more photos of the trace) will be released in about 2 months, so you won't have to wait long ;)

It's very much an original circuit though. I was surprised since most of his are either value-tweaked clones or hybrids.
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Seiche
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Post by Seiche »

How do you infer component values from an xray or gooped board? I assume you degooped it, or maybe took it apart and measured it?

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Post by aionios »

Seiche wrote:How do you infer component values from an xray or gooped board? I assume you degooped it, or maybe took it apart and measured it?
The X-ray was a first pass at mapping out the circuit topology to see if it was even worth the effort to degoop. If it turned out to be a clone of something already known, or close (Cornish described it as original - but you know how that can go) then we might not have gone through the trouble to tear it apart further. But, it was indeed original so we persevered!
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FeVeR2112
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Post by FeVeR2112 »

What Cornish pedal model is this of?

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Post by gght »

OC-1?

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Post by FeVeR2112 »

As it is a "new and original design".... I google searched the Cornish site and found these models that claim to be original:

BD-1
CC-1
OC-1
3Q-1

hmmmm.... which could this be then? oh... the suspense.

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Seiche
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Post by Seiche »

From the website:

BD-1 - Bass Driver
CC-1 - Crunch Pedal
OC-1 - Optical Compressor
3Q-1 - Active EQ with Linear Boost

What sounds most likely? The x-ray doesn't look like an optical compressor tbh, I don't see an optocoupler.

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Post by trixdropd »

That pcb trace design under the ic though lol

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Post by Seiche »

trixdropd wrote:That pcb trace design under the ic though lol
Yeah what is that? Or is that inside the IC?

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Post by plush »

trixdropd wrote:That pcb trace design under the ic though lol
It's not the pcb, it's the insides of the IC.

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Post by johnk »

no schematic yet?

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Post by aionios »

johnk wrote:no schematic yet?
Not yet, but soon. I'm doing up a PCB for it and will pull back the curtain on everything at once :)
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Post by palelight »

Any update on this project? Eagerly awaiting.

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Post by Seiche »

aionios wrote:will be released in about 2 months, so you won't have to wait long ;)
:secret:

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Post by aionios »

Still on track, probably early October the way things are looking.
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Post by palelight »

aionios wrote:Still on track, probably early October the way things are looking.
Thanks! Looking forward to it. :thumbsup

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Post by johnk »

nothing yet?

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Post by aionios »

johnk wrote:nothing yet?
I don't mean to tease, the layout's just extremely tight and it's been kicking me in the pants the past month or so. I finally was able to hunker down and finish it though. An appetizer...

Image

Now shooting for the end of November for this, assuming prototyping goes well.
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Post by aionios »

...And yes, there is an opto-isolator :) It was installed vertically on the PCB so it didn’t show up very clearly in the X-ray.

That probably narrows it down a bit!
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