madbeanpedals::forum

Projects => Build Reports => Topic started by: G.G. on September 23, 2014, 03:43:40 PM

Title: Catch-22
Post by: G.G. on September 23, 2014, 03:43:40 PM
Hi Guys,
This uses the snazzy red Grind Customs board. So many misadventures along the way with this one I was really glad to finally be able to use it. I had soldered in the board-mounted pots and then got the impression that I had reversed the Gain and Volumes labels on the decal, so I unsoldered the pots and wired them in so I could reverse their positions. Then realized the decal was actually correct, and had to put the board-mounted pots back in. Then when I did a pre-box test there was no sound at all. It was either a bad charge pump IC or a cold solder joint somewhere because it came to life after I went over it a few times. I probably could have done top-side jacks had I planned it out better. Sounds very good now, excited to have it on the board!!

(http://i.imgur.com/oh8r1fP.jpg) (http://i.imgur.com/pMNA4bY.jpg)
Title: Re: Catch-22
Post by: brand0nized on September 23, 2014, 03:56:32 PM
Awesome! I want to build this one too! Is that a 1590b?


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Title: Re: Catch-22
Post by: brejna on September 23, 2014, 04:03:20 PM
Finish is awesome (Y)
Title: Re: Catch-22
Post by: G.G. on September 23, 2014, 04:56:37 PM
thanks guys! Yes, it's in a 1590B.
Title: Re: Catch-22
Post by: muddyfox on September 23, 2014, 05:20:44 PM

What's the story behind the name?
Title: Re: Catch-22
Post by: G.G. on September 23, 2014, 05:45:31 PM
Quote from: muddyfox on September 23, 2014, 05:20:44 PM

What's the story behind the name?
It's the Portuguese version of the name of the circuit it's based on. Not super creative but I needed to get the decal done quickly.
Title: Re: Catch-22
Post by: mjcyates on September 23, 2014, 07:35:21 PM
Looks great! I really like the sound of the one I built.
Title: Re: Catch-22
Post by: GrindCustoms on September 24, 2014, 02:25:06 AM
Looks great Gray! Glad you sort it out and mostly that you dig it :)
Title: Re: Catch-22
Post by: wstimson on September 24, 2014, 04:52:19 PM
Looks good, man.  I finished one of those up a couple weeks ago and I'm enjoying it.

What op amp did you end up using?  I tested out 4 different ones and settled on OP275.
Title: Re: Catch-22
Post by: G.G. on September 24, 2014, 04:58:07 PM
I think I went with a 2272. Which ones did you try & how did they sound? I need to test a few out, but was so pleased to actually have it working I forgot about doing that.
Title: Re: Catch-22
Post by: wstimson on September 25, 2014, 02:18:10 AM
I tried the 2272, tl072, op275, and the nec5532. 

We aren't talking about huge differences, but I felt the distortion was a bit more appealing with the op275.
Title: Re: Catch-22
Post by: Leevibe on September 25, 2014, 03:14:32 AM
Monochromatic in the coolest way!! Very well done!
Title: Re: Catch-22
Post by: Guybrush on September 25, 2014, 01:57:25 PM
Looks ace. I recally dig the red knobs.
Title: Re: Catch-22
Post by: G.G. on September 25, 2014, 02:52:40 PM
thanks again guys! I see that Tayda has the op275 so I'll give it a try, thanks for the tip!
Title: Re: Catch-22
Post by: karter2000 on September 25, 2014, 03:05:10 PM
Yeah, I just tried the op275 with mine, and I really like it.


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Title: Re: Catch-22
Post by: wstimson on September 26, 2014, 07:54:56 PM
Quote from: G.G. on September 25, 2014, 02:52:40 PM
thanks again guys! I see that Tayda has the op275 so I'll give it a try, thanks for the tip!

Yeah, that's where I got mine as well.

Let me know what you settle on after you get to try a couple out. 
Always curious about that sort of thing.
Title: Re: Catch-22
Post by: G.G. on October 07, 2014, 02:05:10 PM
Bill, I got to try out an OP275 over the weekend. I wish I was able to A-B them a little easier. My impression was that the OP275 had a little more saturated distortion and while it still sounded good I went back to the TLC2272 because I tend to use the edge of breakup sound a little more. Kind of makes me want to put another one together with the OP275 because they both sound pretty good. Thanks for the tip!
Title: Re: Catch-22
Post by: wstimson on October 08, 2014, 03:46:28 AM
Right on. If you do put together another and a/b it you should post a video.