tag:blogger.com,1999:blog-6847048658257278783.post1979576917352569392..comments2024-03-28T18:53:30.726+00:00Comments on Guitar FX Layouts: Valvette Custom DriveIvIarkhttp://www.blogger.com/profile/08416945174853142251noreply@blogger.comBlogger15125tag:blogger.com,1999:blog-6847048658257278783.post-67059992590857764592014-03-28T12:41:06.264+00:002014-03-28T12:41:06.264+00:00thx for the tip, i just ordered loads of other fre...thx for the tip, i just ordered loads of other free stuff from TI :PMeekhttps://www.blogger.com/profile/15435197202468367637noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-91963740569158517302014-03-18T20:43:22.619+00:002014-03-18T20:43:22.619+00:00I built this one but it is a bit disappointing :( ...I built this one but it is a bit disappointing :( The folks here say it would have quite some gain, and the video makes me think that too, but mine has a rather mild overdrive only. Well... Not Honeybee-ish mild, but not more agressive than a simple TS (thogh the tone charateristic is way different). I used BS170 (obviously turned 180 degrees than the 2N7000) and two 1M pots. Might the BS170's be the cause for this? Also I find that the pot on the hard clipping section does very little if anything at all, so I'll probably stick with the suggested 1M resistor there too.drdFXhttps://www.blogger.com/profile/05100895565160403133noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-50966571017604333202014-03-07T15:22:29.489+00:002014-03-07T15:22:29.489+00:00That's great, thanks for the infoThat's great, thanks for the infoIvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-45770167433998288092014-03-07T15:09:59.097+00:002014-03-07T15:09:59.097+00:00I've just tested the suggestions of Tundra, an...I've just tested the suggestions of Tundra, and I have the same results (normal..)<br /><br />i've tested your suggestion, Ivlark with lug 2 of gain B connected directly to ground, but the result is strange: at 7 am (minimum) there's no change, but when I turn it clockwise, the gain decreases and near the maximum, there's a big jump with a very distorted sound, and at the maximum the sound decreases again.<br />I 've tried it with a A10K too and there's no change.<br />Now the best result is the 1M resistor solution of ontheTundra.<br /><br />I'll try with a 100Kdual gang this evening.<br /><br />obviously, there are big differences depending of the pickups: with my les paul classic, there's tons of gain... with a strat it's more like the video.<br />Anonymoushttps://www.blogger.com/profile/07594089937166037589noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-25503135083685337692014-03-07T11:23:34.394+00:002014-03-07T11:23:34.394+00:00ok thanks
ok thanks<br />Anonymoushttps://www.blogger.com/profile/07594089937166037589noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-52205220936484235742014-03-07T11:09:33.504+00:002014-03-07T11:09:33.504+00:00It's Bright on or Bright off so just a two pos...It's Bright on or Bright off so just a two position SPDT.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-5182093459290913992014-03-07T11:02:06.554+00:002014-03-07T11:02:06.554+00:00Hi,
I'm finishing it, and going to test the di...Hi,<br />I'm finishing it, and going to test the different pot options (10KDG, 100KDG, B1M and B10K, Ivlark's suggestion of gain B connected to ground directly, and maybe other values)<br /><br />But,<br />is the SPDT a ON-ON,or a ON-OFF-ON, please? <br />thanksAnonymoushttps://www.blogger.com/profile/07594089937166037589noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-77996191397052480882014-02-11T10:17:32.416+00:002014-02-11T10:17:32.416+00:00Thanks for the tip, onthetundra! I got my samples ...Thanks for the tip, onthetundra! I got my samples today from TI (really fast, I live in Europe and it did not take a week...), so time to prepare for this one :)drdFXhttps://www.blogger.com/profile/05100895565160403133noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-5725489136570899382014-02-06T19:09:26.729+00:002014-02-06T19:09:26.729+00:00Awesome, so I take it that it's verified then?...Awesome, so I take it that it's verified then?<br /><br />That's a shame about Gain B because I think the hard clipping option should be quite useful in this, I wonder if the Gain B pot would work better if lug was connected directly to ground instead of to the 10u cap and then to ground.IvIarkhttps://www.blogger.com/profile/08416945174853142251noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-57182060883999675742014-02-06T19:01:00.819+00:002014-02-06T19:01:00.819+00:00I used a the correct opamp as well op2107ap. You ...I used a the correct opamp as well op2107ap. You can get free samples from the producer.onthetundrahttps://www.blogger.com/profile/02537670146742701763noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-74935085975344632132014-02-06T18:59:44.183+00:002014-02-06T18:59:44.183+00:00Ive tried it 3 ways.
1. I used a 10kDG pot and f...Ive tried it 3 ways. <br />1. I used a 10kDG pot and found the gain to be minimal. The pedal sounded like a clean boost with the gain maxed.<br />2. I used a 1M pot for Gain A and a 10K for gain B. This was fine but the 10K pot had no effect on the signal.<br />3. The third way which I prefer is to put a 1M resistor on the board in place of the GainB connections and remove that pot completely. Now I just have a 1M gain pot connected to the A connections and this was by far the best. Tons of gain but not too much and the pedal sounds great.onthetundrahttps://www.blogger.com/profile/02537670146742701763noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-40718774452487948572014-02-06T18:35:41.197+00:002014-02-06T18:35:41.197+00:00Ah yeah, I see some of the OP275s for about $2.70,...Ah yeah, I see some of the OP275s for about $2.70, will try one of those... thanks!<br />I will order the proper ICs later if neededJimijamhttps://www.blogger.com/profile/04425566931407259771noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-22316136153116609872014-02-06T17:54:03.281+00:002014-02-06T17:54:03.281+00:00I guess you could try any conventional dual opamp,...I guess you could try any conventional dual opamp, though the OPA's are quite hifi quality... I'd try a simple TL072, then maybe a 4558 and if you don't like those you can go for more expensive ones, the OP275 is a good candidate, it is not cheap, but not 17USD either ;)drdFXhttps://www.blogger.com/profile/05100895565160403133noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-33646852790703673732014-02-06T17:00:52.517+00:002014-02-06T17:00:52.517+00:00Holy Smokes... Mouser wants $16.73 for 1 OPA2107AP...Holy Smokes... Mouser wants $16.73 for 1 OPA2107AP... <br />http://www.ebay.com/itm/251086551593 has 2 for $3.50 - I hope those are legit! lol <br />Can you use any other IC's for this pedal?<br />Jimijamhttps://www.blogger.com/profile/04425566931407259771noreply@blogger.comtag:blogger.com,1999:blog-6847048658257278783.post-35438920796442741622014-02-06T16:29:28.062+00:002014-02-06T16:29:28.062+00:00 Putting in a mouser order now, I did not need to ... Putting in a mouser order now, I did not need to see this one... so adding more parts to my list<br />oh demo is nice... dude has a AB763 Tremolux and this pedal makes it sing... <br />will keep ya posted if I can get this one working<br />Jimijamhttps://www.blogger.com/profile/04425566931407259771noreply@blogger.com