Geiri's demo of his build:
Tuesday, 29 January 2013
Tech21 XXL
Per request. The original design had couple of things i had to mod to get this stripboard and/or 1590B friendly. First, there are two dual opamps in the original box, and they are used in quite peculiar manner. The first one is TL072, which has other half as input buffer for bypassed signal and other half as first gain stage. Which is fine, until... The second opamp is TLC2262, which has its other half as output buffer for bypassed signal and the other as second gain stage. Since onlythe output buffer is after the gain stages, it should not hurt the sound to omit both buffers. But there's little sense in drawing this with two dual opamps and only use other halves.. So i just used one dual - exactly like all the other aproximations/layouts found on the web. There was another little thing.. As with a few other designs, the volume pot is sometimes used to dump the signal to Vref instead of ground. This is ok, but it just means that we need to have a decoupler capacitor before the conventional volume control. I used 2µ2, which is the same value used as output cap at the buffered output. These *shouldn't* affect the sound, but only way to tell... is that someone builds it :)
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Should all layouts be verified before publishing? This would mean less layouts but more peace of mind?
swap the tone 1&3 wire positions, drive 2&3 to 1&2 and drive 1 to 3 and tag it. Think i`ll stick this in one of Matt`s enclosures :-)
ReplyDeleteI just hate it when they don't mark the pot lugs on schematics - usually i percieve them wrong :)
DeleteThanks man! I'll fix those labels and tag it!
+m
Haha, too cool buddy ;0)
DeleteWouldn't mind seeing a photo of that finished badboy if I may please Derek?
Hi can anyone help with this ??....pedal sounds good however, im not getting much from the warp pot, certainly nothing like on the demo vid, its kinda acting like a subtle tone control, where as in the vid it changes into a kinda fuzz...checked my wiring and board and also changed the pot with no better success....any ideas ????
ReplyDeleteOK sorted....it works as it should with my humbuckers....just didnt like my single coil tele...with my LP..sounds like a beast !!
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