Boss OD-1 Schematic?

phillip · February 17, 2004, 03:20:46 PM

Does anyone have a copy of the Boss OD-1 schematic? All the links to the OD-1 schematics in the Schematics 1 and Schematics 2 page are dead.

TIA!
Phillip

Joep · February 17, 2004, 04:02:36 PM

Hi Philip,

Check you mail!

Bye,

Joep

phillip · February 17, 2004, 04:39:01 PM

Thanks Joep!

Phillip

Somicide · February 17, 2004, 05:58:51 PM

Wow, somebody actually has a copy of that? Would you mind sending that my way, too please?

Joep · February 17, 2004, 06:05:05 PM

PM me with your e-mail address.....

phillip · February 17, 2004, 06:09:07 PM

I'll post a freshly redrawn copy of the schematic later this evening

It's a LOT like the SD-1 with the 4558, asymmetrical clipping, etc., but without the tone control.

Phillip

Joep · February 17, 2004, 06:09:59 PM

even better! :wink:

phillip · February 17, 2004, 06:49:46 PM

Here it is

http://axiseffects.home.att.net/misc/OD1.gif

Phillip

petemoore · February 17, 2004, 06:55:49 PM

Exotic looking...Alot of different type parts and a pretty extensive circuit for an OD.

phillip · February 17, 2004, 07:06:34 PM

Most of it is the JFET electronic switching. With the electronic switching removed the parts count would drop by about 50% (maybe more).

Phillip

toneman · February 17, 2004, 07:12:47 PM

Hey Phil,
thanx 4 the schemo
turns out i did not have it.
staytuned
tone

Somicide · February 18, 2004, 01:57:22 AM

and how would one remove the electronic switching (to make for simpler true bypass)?

phillip · February 18, 2004, 03:11:21 PM

Like so:

http://axiseffects.home.att.net/misc/OD1_noswitching.gif

Phillip

Somicide · February 18, 2004, 03:19:45 PM

Many thanks, I've wanted to tackle one of these for awhile!

WGTP · February 18, 2004, 05:23:58 PM

I wonder if that first op amp is overdriving the second one, asymmetrically of coarse. :shock:

Mr.Huge · February 18, 2004, 07:15:58 PM

Actually, there are 2 versions of the OD-1. The first used a quad op-amp with a voltage follower as the first stage.
I have the schematic at home somewhere.

phillip · February 19, 2004, 04:10:33 PM

Mr. Huge, if you find the schematic for the first OD-1, could you email it to me? I'd like to redraw and post that version, too

Phillip

smoguzbenjamin · February 19, 2004, 04:36:37 PM

Removing the FET switching is actually quite easy once you learn to recognize it

Ben N · February 19, 2004, 05:12:10 PM

I imagine you could simplify still further by losing the input and output buffers. (Then you'd be getting pretty close to an asymetric Son of Screamer.)

Ben

smoguzbenjamin · February 19, 2004, 05:20:30 PM

Well I like buffers. Why not leave them in?

News:

Boss OD-1 Schematic?