Phillips "OD-1" vero version working great !

[MartyMart]

I never liked my "very old" OD-1, I'd had it for years, it was the "quad" op-amp version, metal screw from about 1978.
I thought it was "thin" and a bit "raggedy" sounding on anything but very
gentle drive..... it went on Ebay for about 200 bucks !!!!
So I vero-boarded up a version of it, the "dual" op-amp version by Phillip
at Fuzz central, it fired up first time !!
I underestimated the size and had "run out" of vero so it ended up a bit
cramped and included a "daughter board" for the output section..... see
below--->>

http://aronnelson.com/gallery/album03/Vero_Daughter

I used a Burr Brown OPA2134PA which sounds fantastic, also MPSA18's
for both trannies, a mixture of metal film/carbon film resistors and the
caps are from steve, Panasonic ECQ's I think.
Socketed op-amp and trannies ( usual stuff )
It's SOOOO much better than the old original, warm, creamy OD without
a hint of the "thin" sound of the original.
I have a box from "hairforceone" that looks a bit like a Boss box and its
painted bright yellow, so is good to go !!
Once I re-think the layout, I'll post it up as a "neater" version, it only needs a couple more strips and a few holes to fit comfortably.

Thanks to Phillip,
Cheers,
Marty.

[phillip]

Marty, did you mess with the 4K7/0.047uF series and the "level" pot?  I helped Gonzofonts with an OD-1 a few days ago and he had excellent results by replacing the 4K7/0.047uF with 2K2/0.1uF (for more overdrive) and the 10KA level pot with a 100KA (probably increased the output a bit).

Glad you guys are enjoying it!

Phillip

[MartyMart]

Marty, did you mess with the 4K7/0.047uF series and the "level" pot?  I helped Gonzofonts with an OD-1 a few days ago and he had excellent results by replacing the 4K7/0.047uF with 2K2/0.1uF (for more overdrive) and the 10KA level pot with a 100KA (probably increased the output a bit).

Glad you guys are enjoying it!

Phillip

I've done that kind of mod to SD-1's and I didn't like the "gain" increase!
There seems to be enough, but I may "up" the level pot value, perhaps
a 50k would do, as its only a bit quiet now.
Thanks for the schem Phillip  

Cheers,
Marty.

[RDV]

Marty:

I'd b interested to know it compares to an SD-1 soundwise. I know PT uses an old OD-1.

Thanks

RDV

[petemoore]

2 Questions...
 Did you build the whole Jfet bypass switching arrangement?
 Is there a schemtic available that shows an OD-1 for use with true bypass switch ?
 I looked a Fuzz Central, am I missing the OD-1 schematic there? ie..I'm not seeing one.

[phillip]

Here's the schematic of the OD-1 with the JFET switching:

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

And here's the same circuit, but with the JFET switching removed:

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

Phillip

[TheBigMan]

That's cool MM, I've been planning to do the quad opamp version myself.  So many people seem to think it sounds better than the dual version that I have so I was keen to try it out.  Be a while though, I'm currently working on the Colorsound Tremolo on vero.

[MartyMart]

RDV
I have not had a chance to compare them yet, I'll do that tomorrow and
LOUD !!  - I can say that I like it A LOT  

Pete
I used the schem above without the switching section, so yup true bypass

BigMan
I sold my "quad op-amp" version just two months ago.
I never liked it so much, I'm sure this is much better, probably due to the
true bypass/OPA op-amp and generally more "pure" signal path.
It seems "clearer" and a bit more "full" sounding  

Marty.

[petemoore]

Thanks for the links Phillip, and the thread Marty Mart, and for the responses and help everybody !!!
  D4 and R30 [1n1418 and 430 ohm]
 These two seriesed components between Battery - and PS Jack - [I'm not so good at reading PS part of schematic so correct my question for me if necessary please]...what do these parts do ?

[GonzoFonts]

I helped Gonzofonts with an OD-1 a few days ago and he had excellent results by replacing the 4K7/0.047uF with 2K2/0.1uF (for more overdrive) and the 10KA level pot with a 100KA (probably increased the output a bit).
Phillip

:mrgreen:

I do have a problem with mine. It's most likely due to the fact that I build it on a bread-board.

I think there are some shorts and/or opens on the bread-board because the sound will come in and out. Sometimes when the sound does come out, it does not sound like it's supposed to. I can twist the bread-board a little and sometimes I can get it just right where it sounds perfect.

I like building on bread boards because I can swap components out really fast and most of the stuff I build is just for fun and experimentation.

Can anyone recommend a high quality bread-board? The one I have is old and it was top of the line years ago (7 or 8 years ago) but I don't know why it's acting flaky.

Also, where is a good source for Vero boards? I may start building on those. I checked all the local electronic shops in town and they either don’t have them or don’t know what I’m talking about.

Thanks.

GF

[MartyMart]

Thanks for the links Phillip, and the thread Marty Mart, and for the responses and help everybody !!!
  D4 and R30 [1n1418 and 430 ohm]
 These two seriesed components between Battery - and PS Jack - [I'm not so good at reading PS part of schematic so correct my question for me if necessary please]...what do these parts do ?

Pete, i omitted that section too !!
I didn't quite follow it, unless its just some more PS protection, the other
way around ?
Incase of tooo much voltage, like a 16v supply....  ??

I just went with a reverse 1N4002 straight at the 9v + - ->l   before the caps and 9 --> 4.5 VR

Aron has veroboard now       BTW   !!

Marty.

[Melanhead]

Hmmmm interesting ... I just modded 2 of my old quad op-amp versions of this pedal because of the same "thinness" ... ( both had been in a drawer for many years and in pieces ... didn't think they were vintage on e-bay! ) ... Can't remember exactly but I just changed 4 caps in the signal path, all panasonic ... I also put a switch in for symmetrical clipping.... I now love these things! ... I have a TS808 reissue and the OD-1 kicks it's ass

I can take a peek inside the pedal if anyone wants to know what I changed exactly ... but I'm not home at the moment

I found another OD-1 as well but it's a later 4558 model ... it's also in peices and I'm gonna experiment on it

[TheBigMan]

Thanks for the links Phillip, and the thread Marty Mart, and for the responses and help everybody !!!
  D4 and R30 [1n1418 and 430 ohm]
 These two seriesed components between Battery - and PS Jack - [I'm not so good at reading PS part of schematic so correct my question for me if necessary please]...what do these parts do ?

That one I do know.  Older Boss pedals used the ACA power supply (12V unregulated as oppose to 9V regulated from a PSA) so there was a resistor and a diode in the jacks ground path to drop the voltage to 9V.

[MartyMart]

I found another OD-1 as well but it's a later 4558 model ... it's also in peices and I'm gonna experiment on it

:roll:  :shock:  :roll: ......... !!!!!

I wish I could just "find" a few vintage pedals ....   :wink:

To sum up my changes :
PHILLIP......

I switched the 0.047/ 4k7  to a 0.068 and a 3k3 for a little bit more gain
and I'm very happy with it  
Volume pot is now a 50k Log, that solved the output problem too.
BTW:
It's a "killer" sound now I think its better than a stock SD-1, my other
one is modded so hard to tell, perhaps even on sound/quality !

Marty.

[Melanhead]

I found another OD-1 as well but it's a later 4558 model ... it's also in peices and I'm gonna experiment on it

:roll:  :shock:  :roll: ......... !!!!!

I wish I could just "find" a few vintage pedals ....   :wink:


Marty.

... keep looking ...  That's not all I found ...

ckeck this out ... http://diystompboxes.com/sboxforum/viewtopic.php?t=31517&highlight=

Cheers ...