Another round of 'I forgot what I built'.

[kaycee]

Yes Folks, another round of that popular panel show, 'I forgot what I built'? 

This one has been in a box in storage for about a year, I didn't label the face with a name, or put one on the inside back cover. Pretty sure its a Tagboards layout, I've had a scroll through but can't see it there.

Three controls: Fuzz, Volume and Texture.

741 op amp

10n x1
100n x2
470n x1
47uf x1
1uf?
1N4001 x3 (2 as back to back clipping)
Resistors x 7

Can't see the pot values without pulling it out of the case, Pink wire is in, Yellow wires to pot legs 1, blue wires to pot legs 2, Purple wires to pot legs 3.


Any ideas what it is?

[aviherman5]

Rat?

[Rob Strand]

There's too many pedals like that.

The distinguishing features that could narrow it down are,
- Fuzz, Volume and Texture.     <----  assuming these are the original names
- LM741 + 470n cap   ; no transistors or JFETs

[bushidov]

An MXR Distortion+ with a third knob?

[kaycee]

No transistors of Fets. In my mind I labelled the pots as they were, so if it was a rat, it would be filter. I don't think it's a modded Dist plus, doesn't ring a bell.

I just wondered if anyone recordnised the layout, or the part numbers/values jumped out as something particular.

It sounds alright, the texture control doesn't make a dramatic difference. Not a keeper for me, but hard to pass it on if you don't know what it is? Maybe I'll goop it and claim it's a new unique circuit 

[Fancy Lime]

Or, crazy thought, you could just trace it. Seems a simple enough circuit, no?

Andy

[kaycee]

Indeed I could, but that means stripping out a perfectly good working circuit just to see what it is. Just thought it might be obvious to someone.

[JustinFun]

Opamp colorsound tonebender seems to fit from squinting at the thumbnail here (as i'm not going to pay for it):

https://thecodemachine.co.uk/Schematics/Buy.php?manuf=Colorsound&model=ToneBender&book=File&vol=Colorsound_SolaSound-ToneBender.Effects&sec=0&page=gif&thumb=Thumbs/Colorsound_SolaSound-ToneBender.Effects.jpg

[amptramp]

Is this a DOD 250?  It looks simple enough.

[kaycee]

Bootleg, Jazz Fuzz.

I'd labelled the 'vintage' control texture because it seemed a silly name.

Thanks for the guesses, gents.

[Fancy Lime]

Indeed I could, but that means stripping out a perfectly good working circuit just to see what it is. Just thought it might be obvious to someone.

Glad you solved it. But for future reference: I would have first tried to figure out what of the easily accessible parts connects to what using a multimeter. That would give you a partial schematic that should normally be enough to figure out the rest of the schematic using educated guessing. For example, if the diodes are to ground or in the negative feedback loop would be easy to meter and go a long way of determining the circuit if you already know it's some more or less common diy circuit.

Cheers,
Andy

EDIT: do you have a schematic? Sounds interesting.

[bushidov]

http://tagboardeffects.blogspot.com/2013/03/boot-leg-jzf-1-jazz-fuzz.html
Can't say I've heard of it before. Interesting, though.

[kaycee]

I did run through it with a meter and come up with a partial schematic. The diodes to ground via a pot threw me as I assumed they were in the feedback loop when I didn't find continuity to ground on either side. I'm not good with resistor bands and can grab about half hour a week in the shed on this stuff, so it's not I can't be arsed or don't know how, just need to use that time efficiently.

The schematic is out there to google, been out for a long time. Not sure the vintage control is traced right as it doesn't do that much.

[Rob Strand]

http://tagboardeffects.blogspot.com/2013/03/boot-leg-jzf-1-jazz-fuzz.html
Can't say I've heard of it before. Interesting, though.

Looks like it although the pot naming is different.

There were a couple of old threads on this forum talking about a Texture pot and diodes but the links were all dead.  Perhaps those were the original pedal.     kaycee's layout  sure looks  the same as your link, so if those earlier threads were the original they would have to have this layout as well.