Electro-Harmonics Guitar Synthesizer.

jrc4558 · December 01, 2004, 06:30:04 PM

Hey everybody!
I wonder if anybody has got a layout for that beast, or if anyone selld boards for this magnificent effect.
Thanx in advance.

niftydog · December 01, 2004, 06:50:06 PM

contact the guy who started this thread. The link doesn't appear to work.

Marcos - Munky · December 01, 2004, 08:48:42 PM

If you want the layout for the Micro Synth, send me a e-mail. But I believe that you're talking about the Guitar Synth, not the Guitar Micro Synth, which are different beasts.

jrc4558 · December 01, 2004, 11:45:41 PM

Ah, actually, I would like to look at both!
Schematics too, if you have of course.

Thank you kindly.

asterius@hotmail.com

StephenGiles · December 02, 2004, 08:01:35 AM

My tracings of the EH Guitar Synth are on Mark Hammer's site and a photo of my stripboarding of it is here somewhere. There is a discontinued part - TL601 switch used in the muting circuit from memory, and there are 2 of them. I'm sure someone here would be able to find a workaround.
Stephen

jrc4558 · December 02, 2004, 08:03:40 AM

Oh, Markos. When you will be sending the pictures as attachments, don't send them all in one e-mail. I don't think hotmail accepts more than 2Mb of attachments at a time now. Thank you very much.

Marcos - Munky · December 02, 2004, 08:49:15 AM

I sent the files. I don't have the Stephen's layout for the Guitar Synth, if anybody have it, please send it to me.

StephenGiles · December 02, 2004, 01:07:44 PM

I don't think anyone has a layout for the EH Guitar Synth, so there's a job for someone over Christmas. Mine is on Veroboard, as you know, currently not working, and don't even think about asking for a Veroboard layout!!!!!
Stephen

jrc4558 · December 02, 2004, 02:39:33 PM

Ahm...

Can I please have a vero-board layout?

Damn!!!

I knew I was forgetting something.

Well we'll have to bribe Santa this year.

StephenGiles · December 02, 2004, 03:40:00 PM

This is the board I made in 1980-81. No layout exists I'm afraid.

Stephen

Transmogrifox · December 02, 2004, 04:18:09 PM

Pretty impressive build (even if it isn't working, it's quite a job getting it to look like that). I would really like to see the schematic to that, so if anyone has it, my email adr is transmogrifox@yahoo.com

StephenGiles · December 02, 2004, 04:35:32 PM

oops - mistake :!:

jrc4558 · December 02, 2004, 05:16:18 PM

Oh my !%$& god...
Stephen, I bow to you...
This is incredible...
I think I'll pass for now. Unless I can buy a board for it somewhere...

Marcos - Munky · December 02, 2004, 05:23:22 PM

Hey Transmogrifox, check your e-mail.

Transmogrifox · December 02, 2004, 09:16:31 PM

Thanks a bunch. It will be a cool one to chew on for a while.

StephenGiles · December 05, 2004, 04:43:04 PM

I managed to join together 7 scans I did of the original circuit so you can see just what you are up against!
http://img.photobucket.com/albums/v317/StephenGiles/EHguitarsynth1-2.jpg
Stephen

snap · December 06, 2004, 05:21:09 AM

nice "over christmas" job!

Zero the hero · December 06, 2004, 05:24:15 AM

Sounds like a nice challenge...
I have not much time now, but a layout for this beast could be very interesting.
Stephen ,that's a job that I can do (soon). Is the schematic correct? The one you posted is a factory schem? Which is the obsolete part? Does this circuit work with an hex pick-up or with a standard one?
I'm going to PM you!!!

snap · December 06, 2004, 05:38:43 AM

obsolete: TL601 switcher
monophonic (single input)

Zero the hero · December 06, 2004, 07:23:24 AM

I've found the datasheet (thnkx TI).
A couple of OR ports and a 4066 should replace this chip.
Dunno if there's a pin-to-pin equivalent: I'll do more search
I have to go back to work... :?

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Electro-Harmonics Guitar Synthesizer.