I don't know if Bullitt is doable since I've never dabbled with tubes in a stompbox before let alone doing a layout for it. I have taken a look at the schematic and saved it in a folder by I can't promise anything.
built it up. low output (just below unity at max). Drive connections need reversed then controls function as described. Was a tad bright so swapped 220n to Vol 3 to 330n Sounds like it should (gnarly distortion bordering on fuzz) but low output. Checked for bridges and possible mistakes. Everything good. Quite a strange power supply in schematic. Possible problem there? If anyone had better luck let me know. Thanks again for all the great layouts!!
Found a mistake:-/...but you can fix it with a hack. Top leg of the 330k resistor at the right needs to be moved from pin 6 of the op amp to row B; same row as 22nF/100k/22k junction. Since this is part of the feedback network of the second half of the op amp, theere should be a volume boost with this change.... I'll update the layout as soon as I can.
Made changes to old layout by moving 330k from G-15 to B15 no real improvement and distortion is more gated fuzz now. also noticed you moved other 330k from H-17 to G-17 tried that as well but all changes netted no real output improvement and thick distortion is now gated fuzz. Sorry for all the hassle.
Compared everything to the schematic....everyhing looks legit. It is possible that the schematic is buggy...we know the gain control was wired wrong... I'll think I'll tag it "On Hold".:-/
Built one before the update and it did not sound good. Updated it to current layout and it's still bad. Tried two different dual op amps and no luck. Sounds like a distorted high pass filter.
I looked at the schematic on FSB. What is the 2n3906 doing in the power section? Also, why is there the 220uf and the 2.2uf electro caps together? That seems redundant, but I don't know. Anyways, not sure if the schematic is accurate. Thanks for working on the layout.
Looks like the 2n3906 is used in switching. I am wondering if there is a variation in voltage as the schematic shows DC input features 4 diodes (bridge rectifier) 1MH inductor, a 1/2 watt 100r resistor, 220uf and 2.2uf are on each end of the inductor with even more filtering before hitting pin 8 of IC. just fishing at this point.
I doubt it would make a big difference. There will be slightly larger voltage drop with the bridge rectifier and the internal resistance in an inductor can vary quite a bit....from 10ohm to 500ohm if I'm not mistaken... You can try a red LED in place of the 1N5817 to simulate the larger voltage drop. Oh, and the 2N3906 is used for switching indeed and don't affect the audio circuit.
I built this last night and can verify this layout! Thanks to everyone that tried the build and helped get it corrected (and thanks to fuzzhead for keeping these up-to-date).
I will compare it today against online demos of the pedal but it sounds fantastic as far as I'm concerned. Nice & loud (and a pretty quick build overall). I had to use a 1N4001 since I didn't have a 1N4007 but it sounds great to my ears.
I would also call out (for anyone attempting the build) - keep an eye on the 220uf & 2.2uf. The 220uf at E18 is a big one but it only spans 2 rows while there is a 2.2uf at A7 is spanning 3 rows. Had to double-check this one while I was building.
Attempting this today. Is there a way to formally request a layout? Or can I pay you for a specific layout? The Tone God Bullitt Tremolo.
ReplyDeleteI don't know if Bullitt is doable since I've never dabbled with tubes in a stompbox before let alone doing a layout for it. I have taken a look at the schematic and saved it in a folder by I can't promise anything.
DeleteLooking forward to trying this out with my Brent Hinds Terror amp!
ReplyDeletebuilt it up. low output (just below unity at max). Drive connections need reversed then controls function as described. Was a tad bright so swapped 220n to Vol 3 to 330n Sounds like it should (gnarly distortion bordering on fuzz) but low output. Checked for bridges and possible mistakes. Everything good. Quite a strange power supply in schematic. Possible problem there? If anyone had better luck let me know. Thanks again for all the great layouts!!
ReplyDeleteFound a mistake:-/...but you can fix it with a hack. Top leg of the 330k resistor at the right needs to be moved from pin 6 of the op amp to row B; same row as 22nF/100k/22k junction. Since this is part of the feedback network of the second half of the op amp, theere should be a volume boost with this change....
DeleteI'll update the layout as soon as I can.
Layout is now updated.
ReplyDeletewill give it a go. Thanks so much!!!
ReplyDeleteMade changes to old layout by moving 330k from G-15 to B15 no real improvement and distortion is more gated fuzz now. also noticed you moved other 330k from H-17 to G-17 tried that as well but all changes netted no real output improvement and thick distortion is now gated fuzz. Sorry for all the hassle.
ReplyDeleteCompared everything to the schematic....everyhing looks legit. It is possible that the schematic is buggy...we know the gain control was wired wrong...
DeleteI'll think I'll tag it "On Hold".:-/
Built one before the update and it did not sound good. Updated it to current layout and it's still bad. Tried two different dual op amps and no luck. Sounds like a distorted high pass filter.
ReplyDeleteI looked at the schematic on FSB. What is the 2n3906 doing in the power section? Also, why is there the 220uf and the 2.2uf electro caps together? That seems redundant, but I don't know. Anyways, not sure if the schematic is accurate. Thanks for working on the layout.
Looks like the 2n3906 is used in switching. I am wondering if there is a variation in voltage as the schematic shows DC input features 4 diodes (bridge rectifier) 1MH inductor, a 1/2 watt 100r resistor, 220uf and 2.2uf are on each end of the inductor with even more filtering before hitting pin 8 of IC. just fishing at this point.
ReplyDeleteI doubt it would make a big difference. There will be slightly larger voltage drop with the bridge rectifier and the internal resistance in an inductor can vary quite a bit....from 10ohm to 500ohm if I'm not mistaken...
DeleteYou can try a red LED in place of the 1N5817 to simulate the larger voltage drop.
Oh, and the 2N3906 is used for switching indeed and don't affect the audio circuit.
This comment has been removed by the author.
ReplyDeleteI think there's a mistake.
ReplyDeleteThe layout needs a cut track in C8, else pin 7 and pin 1 are connected together.
Nice catch. I'll try upload a corrected layout within a week...
DeleteThe layout is now updated.
DeleteI built this last night and can verify this layout! Thanks to everyone that tried the build and helped get it corrected (and thanks to fuzzhead for keeping these up-to-date).
ReplyDeleteI will compare it today against online demos of the pedal but it sounds fantastic as far as I'm concerned. Nice & loud (and a pretty quick build overall). I had to use a 1N4001 since I didn't have a 1N4007 but it sounds great to my ears.
I would also call out (for anyone attempting the build) - keep an eye on the 220uf & 2.2uf. The 220uf at E18 is a big one but it only spans 2 rows while there is a 2.2uf at A7 is spanning 3 rows. Had to double-check this one while I was building.
Delete