EHX Worm Schematic?

[Scruffie]

You probably have it, but I bought the Stereo Memory Man schematic for one I was repairing. It's the 7811B version (dated 1982). If you want it, let me know.

I do have it, got it from you already you attached it at FSB a long time back so I owe you a thank you!

I think i'm only missing a handful of vintage ones now (from what's out there anyway) the solid state reverb, echo 600 and the Panic Button... probably a couple of others too.

[GrindCustoms]

You probably have it, but I bought the Memory Man Stereo schematic for one I was repairing. It's the 7811B version (dated 1982). If you want it, let me know.

I'll take that one too if you don't mind. 

I have the factory schematic that i will completely re-draw accordingly to the pedal i'll have in hand.

Will also take out the EHX bypass switching and add a charge pump setup with Vreg in the schem.

That way i'll be OK to publish to the masses without being sued, i think.

Oo, the factory schematic for that is missing from my collection, think you could e-mail me a copy?

Done!

You probably have it, but I bought the Stereo Memory Man schematic for one I was repairing. It's the 7811B version (dated 1982). If you want it, let me know.

I do have it, got it from you already you attached it at FSB a long time back so I owe you a thank you!

I think i'm only missing a handful of vintage ones now (from what's out there anyway) the solid state reverb, echo 600 and the Panic Button... probably a couple of others too.

Any chance that you have the Y-Trigger?

The filter whore in me is very curious to see what is happening in that one.

[artstomp]

..Rej..i also have a vintage EHX WORM..its kinda noisy..im super excited for your mods...

[Scruffie]

I think i'm only missing a handful of vintage ones now (from what's out there anyway) the solid state reverb, echo 600 and the Panic Button... probably a couple of others too.

Any chance that you have the Y-Trigger?

The filter whore in me is very curious to see what is happening in that one.

I do, although i'm not sure I entirely trust it, I seem to recall trying to trace it against some gut shots and things not matching up.

Here's my redraw, the factory original is hard to read.

[GrindCustoms]

Danke!

I guess that i'll have no choice but too buy the unit i saw.......

[GrindCustoms]

Y-Triggered purchased! We'll have a verified schematic in a near future.

[jimilee]

Dude, this pedal looks insane!!!

[m-Kresol]

Thanks for the schematic. I really dig those old EHX effects. And this gives me an additional chance to try my skills in Eagle.

EDIT: I redrew the schematic in eagle and stumbled upon the following problems:
* the nets V/2 and GND are connected (junction at R33/R34), so I randomly left that connection off
* I don't get the switch at the output jack. It just closes a direct connection to the input (-> no effect, I assume) and is not connected to any other thing?? or is the adjacent triangle symbol supposed to be the second lug of a SPDT switch? I kinda took it for GND which didn't make any sense either (R38 would connect GND with GND...)

[Scruffie]

Thanks for the schematic. I really dig those old EHX effects. And this gives me an additional chance to try my skills in Eagle.

EDIT: I redrew the schematic in eagle and stumbled upon the following problems:
* the nets V/2 and GND are connected (junction at R33/R34), so I randomly left that connection off
* I don't get the switch at the output jack. It just closes a direct connection to the input (-> no effect, I assume) and is not connected to any other thing?? or is the adjacent triangle symbol supposed to be the second lug of a SPDT switch? I kinda took it for GND which didn't make any sense either (R38 would connect GND with GND...)

R33/34 is exactly as shown in the factory schematic, as I said, it didn't match up to a unit gut shot so it's most likely littered with red herrings, EHX did this on a few of their schematics (there's one for the Attack Decay around in pdf format that is all kinds of wrong) OR because of the schematics poor readability, while it looks like it's drawn a specific way it's actually not.

Once again, the output switch is drawn as per the schematic to look like the factory schematic (a long time back I did a bunch of vintage EHX schematics in this style, just to make them more readable) however, I think the ground symbol from R30 is actually the other lug of the SPDT.

Here is the factory schematic so you can see what i'm saying and decide for your self.

[m-Kresol]

OK, now I understand why you redrew the schematic in the first place. That one really is a mess. I initially thought you cleaned it up and so on, but you basically just did it to make it readable. Thanks for clearing that up.

Is it too bold too ask for more vintage schematics? Also, I have no idea how they handle those because of trademarks etc.. I'm not going to build any of those myself (I leave that to the professionals around here) since I'm only beginning to understand what's going on in those black-boxes, but I like to get into Eagle more and build up some knowledge

[GrindCustoms]

In some cases you'll have to buy them or have really good friends, wich is fairly common here. 

I have a serious addiction to everything that is vintage circuitery, lots of them use components that are no longer available, funky pcb trace, enclosures where mostly nice and artsy molds. It's awesome.

Just keep in mind when working from the old stuff, that you'll have to sub some parts for currently produced one... like in the Y-Triggered here where the core of the circuit is the CA3094 that is no longer/widely available. So it will happen quite often that you'll have a sub for it, but need to compensate some «functionnality» of the component to work efficiently in the particular application you are throwing it in. And that's where the brilliant mind rises, thing that i'm really not up to at the moment.

All this to say that the vintage circuits are an excellent platform to learn and of the most interesting to thinker, evolve from.

[Scruffie]

I can be a very good friend  although, I reserve the right for Lectric FX to get first dibs on PCBs if I hand them out 

In some cases you'll have to buy them or have really good friends, wich is fairly common here. 

I have a serious addiction to everything that is vintage circuitery, lots of them use components that are no longer available, funky pcb trace, enclosures where mostly nice and artsy molds. It's awesome.

Just keep in mind when working from the old stuff, that you'll have to sub some parts for currently produced one... like in the Y-Triggered here where the core of the circuit is the CA3094 that is no longer/widely available. So it will happen quite often that you'll have a sub for it, but need to compensate some «functionnality» of the component to work efficiently in the particular application you are throwing it in. And that's where the brilliant mind rises, thing that i'm really not up to at the moment.

All this to say that the vintage circuits are an excellent platform to learn and of the most interesting to thinker, evolve from.

A lot of these vintage EHX pedals I actually have built on the breadboard (subs applicable and even the huge ones, I believe I may have been the first person ever to clone the EHX Attack Decay, my board attached) but at the time I did these redraws (and I did many) there was barely any interest and I put a LOT of hours in to the redraws and digging out copies of the old schematics and gut shots and tracing etc... I seem to recall I even got in touch with one of the original EHX designers. I then also found out that people (DIY guys who had shown interest in what I was doing) I had asked for help at the time who had asked for money (when I was doing it for free) in return for said help, had then used my work after it was finished to try and make money from other DIY individuals in private which irked me (as this was meant to be a DIY spirit thing) and I pulled down the ones that I felt were being used for anything other than repairs, I did hand them all over to a guy doing an EHX collection page he had but the site as far as I know never got finished.

Anywayyy, in a lot of them I know how to sub the parts already and these schematics are a good few years old now and I haven't amended them so I might know of mistakes that are in there but need a reminder.

OK, now I understand why you redrew the schematic in the first place. That one really is a mess. I initially thought you cleaned it up and so on, but you basically just did it to make it readable. Thanks for clearing that up.

Is it too bold too ask for more vintage schematics? Also, I have no idea how they handle those because of trademarks etc.. I'm not going to build any of those myself (I leave that to the professionals around here) since I'm only beginning to understand what's going on in those black-boxes, but I like to get into Eagle more and build up some knowledge

EHX don't seem to care about much that isn't the modern production schematics (I never got any hassle) and once redrawn they're my art work so I can do what I please with them I think is how the law on the matter works in a basic sense.

Anyywayyyy, tell me what you want and i'll see what I have.

Attack Decay Board  (Despite the awful photo I like showing it off because... first!)

[GrindCustoms]

Thanks a bunch for everything you've done, seriously.... lately i've been spending lots of time reading threads about those EHX design, i've went through couple that where from you, some back in 2009... and i totally understand about your feelings toward the work/effort put into these to in the end... get back stabbed, found that to be very insulting.

Just send me a PM or email if you see that i'm leaning toward a project that you where about to bring to fruition or planning.

Stoked for the Attack Decay project from Brian and everything Keefe and you will produce with Lectic-Fx. 

[Scruffie]

Thanks a bunch for everything you've done, seriously.... lately i've been spending lots of time reading threads about those EHX design, i've went through couple that where from you, some back in 2009... and i totally understand about your feelings toward the work/effort put into these to in the end... get back stabbed, found that to be very insulting.

Just send me a PM or email if you see that i'm leaning toward a project that you where about to bring to fruition or planning.

Stoked for the Attack Decay project from Brian and everything Keefe and you will produce with Lectic-Fx. 

It's been long enough to let it go, i'm sure to be honest they downloaded the schematics and made nothing, it just annoyed me at the time, it was a rough time and doing the redraws was keeping me together so I think I looked at them as my babies haha.

Go ahead with the Y-Triggered, i'll give you all I have on it, PM me your e-mail.

Anyway, m-Kresol, here's one to get you started, see if you can spot the mistake (the only one I know of) that I missed... this is one I would like to do, just cause of that damn fundamental extractor... Howard Davis is one smart cookie.


And I think I pulled these so i'm reposting them, a trace I did of the original PCB, it just needed a little more work to be completed;





and the original factory schematic;

[GrindCustoms]

Holy Multicomplexity! 

When you put your heart into something, it's natural to get attached to it.

Very generous from you.

Merci beaucoup!