Help identify pcb?

[theehman]

I recently found this pcb in my file cabinet and I have no idea what it was for.  I was hoping somebody here could help me identify it.  Thought that it might be for a Craig Anderton project due to the pad labeling but I didn't see it in the EPFM book.

[willienillie]

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[Marcos - Munky]

That curved traces and pad locations kinda looks like a general guitar gadgets layout.

[Rob Strand]

There's a date 13 March 1999!!!  That's going to remove virtually all the DIY internet stuff.
So the EPFM book would move up the list.

The bottom left of the pic (as shown) looks a bit like a Fender/Marshall tone stack;  didn't really trace it though.  At first I thought that part was an overly artistic DIP8 package  .

[jimbeaux]

If it's out of Anderton's EPFM first or second books - it's probably been redesigned to use an 8-pin DIL chip (TL072, NE5532,...) instead of the obsolete 4739.

- or maybe a single op-amp design

Nothing jumps out -

[Mark Hammer]

If it's out of Anderton's EPFM first or second books - it's probably been redesigned to use an 8-pin DIL chip (TL072, NE5532,...) instead of the obsolete 4739.

- or maybe a single op-amp design

Nothing jumps out -

I'm inclined to agree.  Clearly a dual op-amp, and the lettering is typical of Anderton.

[anotherjim]

I don't think it's a DIP8 IC. Why are all those pins only going to wire pads and not other components? Possibly it's a 4pole DIP switch for options. I can see a couple of places look like triangle pad for transistors.
I don't know what it is though 

[Rob Strand]

I don't think it's a DIP8 IC.

Agreed, it's too wonky.

I can see a couple of places look like triangle pad for transistors.

Seems like that to me too.  The components connecting to the middle of the thick ground track at  bottom look like an bypassed emitter circuit.   Perhaps a resistor from E to gnd then a series R+C network in parallel with that resistor.  If that's the case there can't be too many ckts in that book with that pattern.  What said isn't quite right!

[Marcos - Munky]

There's a date 13 March 1999!!!  That's going to remove virtually all the DIY internet stuff.

A good number of people were already active back then. Some stuff from Aron, GGG and RG Keen dates back to 1998, like this classic tube pedal. RG's millenium bypass dates back to 1999. The LPB-1 schematic I have here was published by AMZ in 1995! 

The main problem is most of the stuff available back then are not available now, because a lot of content were lost just due to the pages going offline. A good number of stuff was hosted on angelfire, for example. That makes it harder to track the design.

I don't think it's a DIP8 IC.

Me neither. Looks like 4 resistors/caps/diodes.

[Rob Strand]

A good number of people were already active back then. Some stuff from Aron, GGG and RG Keen dates back to 1998, like this classic tube pedal. RG's millenium bypass dates back to 1999. The LPB-1 schematic I have here was published by AMZ in 1995! 

True, there were a small number very early on.  An early one I remember was Dan Charrois,

https://web.archive.org/web/19970605225913/http://www.ee.ualberta.ca/html/cookbook.html

The form of the sites in the early days was much different to today.  These days we have sites with a lot of PCB layouts and vero layouts, very much focused on *building* pedals - often with no schematic.   In those days it was mainly schematics, and often with a lot of errors  .   The building was up to you.  I'm sure you and many old timers here remember how it was back then.   I think RG put up a lot of layouts in the early days, then came along Tone Pad and Guitar Gadgets, and following that the build-orientated sites.

In find it interesting the internet back then was about people, building communities and giving.   Now it's about companies, ownership, taking and of course deception.

---------
Here's another oldie,

Lepers Schematics - Music Electronics µarchive (Jamie Heilman)
http://audible.transient.net/archive/

http://audible.transient.net/archive/contents.html

IIRC the zip collection had a lot of old EHX schematics like the LPB-1; maybe in "5 EH Tone Boosters".

[Rob Strand]

Some stuff from Aron, GGG and RG Keen dates back to 1998

I found this on GGG, it's the ring modulator of EPFM (perhaps an updated layout though),
http://www.generalguitargadgets.com/wp-content/uploads/epfm09.gif
(see also http://www.generalguitargadgets.com/effects-projects/extras/epfm-book/)

Dated June 2000 and the wire labeling looks very similar to Ron's PCB.