Just finished this... here's a list of mods...
Replace U1, U2 with NE5532.
Replace C2, C3, C4, C5 with 0.1uF poly caps.
Replace C7, C11 with 0.1uF poly caps.
That's it. I just hooked it up to a beep box (a tb-303 clone, borrowed from my friend hektor) and ran thru some of the presets. It sounds great. I will post an mp3 sample so you can hear it. My pal makes evil industrial-techno so don't consider this a reflection of my own musical taste :) There is some brief hissy noise around 2:02 but that's the "fuzz" effect with the noise turned all the way up... and I hope you don't sit and listen to this for more than two minutes anyway!
The sample: http://www.toothpastefordinner.com/ineko-sample.mp3
The original picture of the inside: http://www.toothpastefordinner.com/ineko-inside.jpg
The picture of the finished mod: http://www.toothpastefordinner.com/ineko-post-mod.jpg
drew
toothpastefordinner.com
Awesome! 8)
See my notes in your other thread that I edited into my double post. I was done editing a few minutes after you posted this thread.
Great job! How much did it improve things?
-Peter
It GREATLY improved things. Before, it was hard to hear what was going on over the noise... now, you can actually hear that the effects are pretty decent. I have an electronics page I'm cobbling together slowly and I will put some stuff up there when I get it up. Probably in a couple of weeks. At any rate, it was basically unusable before as it added a thick layer of hiss to anything that I put thru it.
(The old thread is here: http://diystompboxes.com/sboxforum/viewtopic.php?t=12109 but I'll answer questions in this thread.)
There aren't any parts on the bottom of the board. It IS double-sided though I think this is probably just to keep them from having to install jumpers, etc.
The cap on the outputs isn't a filtering cap, it's a DC-blocking cap (to keep any DC from hitting the opamps and driving them into saturation on the input side, I assume, and to keep DC from exiting the box.)
You are right about the filter/buffer though... I realized about halfway thru that since it's a stereo box (L/R in, L/R out) that only half of those i/o opamps is working on each side!
drew
toothpastefordinner.com