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Title: Boss OD-1 Schematic?
Post by: phillip on 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

Title: Boss OD-1 Schematic?
Post by: Joep on February 17, 2004, 04:02:36 PM

Hi Philip,

Check you mail!

Bye,

Joep

Title: Boss OD-1 Schematic?
Post by: phillip on February 17, 2004, 04:39:01 PM

Thanks Joep!

Phillip

Title: Boss OD-1 Schematic?
Post by: Somicide on February 17, 2004, 05:58:51 PM

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

Title: Boss OD-1 Schematic?
Post by: Joep on February 17, 2004, 06:05:05 PM

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

Title: Boss OD-1 Schematic?
Post by: phillip on 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

Title: Boss OD-1 Schematic?
Post by: Joep on February 17, 2004, 06:09:59 PM

even better! :wink:

Title: Boss OD-1 Schematic?
Post by: phillip on February 17, 2004, 06:49:46 PM

Here it is :)

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

Phillip

Title: Pretty Cool !!!
Post by: petemoore on February 17, 2004, 06:55:49 PM

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

Title: Boss OD-1 Schematic?
Post by: phillip on 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

Title: Boss OD-1 Schematic?
Post by: toneman on February 17, 2004, 07:12:47 PM

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

Title: Boss OD-1 Schematic?
Post by: Somicide on February 18, 2004, 01:57:22 AM

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

Title: Boss OD-1 Schematic?
Post by: phillip on February 18, 2004, 03:11:21 PM

Like so:

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

:)

Phillip

Title: Boss OD-1 Schematic?
Post by: Somicide on February 18, 2004, 03:19:45 PM

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

Title: Boss OD-1 Schematic?
Post by: WGTP on February 18, 2004, 05:23:58 PM

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

Title: Boss OD-1 Schematic?
Post by: Mr.Huge on 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.

Title: Boss OD-1 Schematic?
Post by: phillip on 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

Title: Boss OD-1 Schematic?
Post by: smoguzbenjamin on February 19, 2004, 04:36:37 PM

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

Title: Boss OD-1 Schematic?
Post by: Ben N on 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

Title: Boss OD-1 Schematic?
Post by: smoguzbenjamin on February 19, 2004, 05:20:30 PM

Well I like buffers. Why not leave them in?

Title: Boss OD-1 Schematic?
Post by: Somicide on February 19, 2004, 05:49:16 PM

well judging from what i've heard, ben, you take out the buffers so you have your high impedence signal from the pickups go into your non-buffered effects (like a fuzz, which needs high impedence, i believe). unless of course, you put the buffered at the end of the chain, although i think certain FFs dont like buffers anywhere in the chain, temperamental bastards.

Title: Boss OD-1 Schematic?
Post by: smoguzbenjamin on February 20, 2004, 04:41:41 AM

Well OK, judging from that I guess it depends on you needs :) I don't use a FF and most of my effects are pretty well-behaved. If it were me I'd leave the buffer in, but hey, that's me ;)

Title: Boss OD-1 Schematic?
Post by: amz-fx on February 20, 2004, 08:16:16 AM

Quote from: Ben NI 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

If you remove the buffers, you essentally have the Clark Gainster or Menatone Red Snapper! :shock:

DIYstompboxes.com

DIY Stompboxes => Building your own stompbox => Topic started by: phillip on February 17, 2004, 03:20:46 PM