I got the DS-1 mod file and found out I had the wrong chip for the mod.
Well..... I only paid $10 for the pedal at a pawn shop.... so what have I got to lose???
I sat down and compared the circuit I had to the schematics. I found out that they aren't that far off. The major differences are two things: the circuitry around the IC (since mine is a 7 pin SIP ... not an 8 pin SIP), AND........the attachment of the LED to the switching logic was weird. The LED was attached to the foot button.......not the flip-flop... so the light would only light up when you stepped on the pedal.
Also worthy of note..... I dont know the history of these pedals....but some of the cap values that the mod puts in.... are already THAT value in the pedal that I have. i.e. .047 caps are already .1, .47 caps are already 1......BUT...they are electrolytics. I've always been told the electrolytics can have weird little phase shifting effects that degrade the purity of the signal.... so I am replacing them with the correct type as well. I'm also going to move the LED cathode....to be like the MOD drawing... so that I can tell when my pedal is off/on by looking.
Anyway, it'll be interesting. Granted... I don't hav e the chip specified by the MOD........but...considering that I dont have a lot of value in it, and that the mod changes make sense to me (they seem to be about increasing bass/smoothness), I just cant think of what I have to lose in trying. Hopefuilly it should only sound better.
I'm guessing that yours has the TA7136AP in it. I haven't had any experience with that version, but the mods might work in that, too. The circuit board numbering (if there is any...) probably won't be the same, though.
Believe it or not........I took your mod set........and the one that I got from Indy......his has a lot of pictures....and in his pics.......all the parts....... line up with the same board part numbers. In fact...the board doesn't even HAVE any numbers marked on it. But if Indy's pics show a set of parts.....by the number....and I go look at my board...the value is right....it is in the right point in the circuit.... so I feel pretty comfortable that I will get the desired result.
Also, again, where there are value differences on the caps.....USUALLY.....the cap on my board.... is already the value that you spec in your mods.....but the 1uf caps.....are electrolytics...so I am replacing them with the 1ufs that you used.
