Thursday, October 12, 2017
Wampler Tweed '57
Here's another (and more complicated) amp emulator, and another great design from Brian Wampler. This one stacks JFET stages much like the Cranked AC. It emulates a dirty Fender tube amp with a 3-band tone stack. I added trimmers so it's easier to bias the JFETs and it's laid out for board mounted pots in a 125B enclosure.
Great!! Please the black 65!!! Excellent Work!!!
ReplyDeletedude! please, make a sea machine layout! (it's the mad bean's gravity wave!) :D
ReplyDeleteWhat's wrong with building Bean's layout? He's got some awesome etchable layouts. Built a few myself.
DeleteThere's a stripboard layout on http://tagboardeffects.blogspot.com/ if you don't want to etch a board.
Deletenothing really, i would love to see your take on the sea machine :D you make great layouts
DeleteCan't you just build the madbean layout on perf instead of a pcb?
ReplyDeleteNot really, the traces on the Madbean pcb are a lot smaller than perf hole spacing, so if you just transferred directly to perf, it wouldn't even fit in a 1590BB. The stripboard layout I posted above is reasonably sized, just do that one.
DeleteMan I wish the J201s wouldn't cost an arm and an leg, this seems like a fun build.
ReplyDeleteIf you go the smd route you can get them at Tayda for 17 cents a piece. (I think). You have to get adaptors though. You can get them from OSH park if you don't want to etch them yourself. They are better and cheaper than the adaptors you can get on evilbay ��
ReplyDeleteMark it....just finished...Fired it up and it worked first go. I'm surprised considering how hung over I am. I built it on perf.
ReplyDeleteHaha nice. Thanks for verifying!
DeleteWhich smd is used in place of the j201 and will the results be the same?
ReplyDeleteMMBFJ201 is the SMD equivalent. Results will be the same as through hole J201s (possibly better considering the inconsistency of through hole J201s available).
Deletei cant find 1uf non polar, can be subtitute with 1uf elco? thanks
ReplyDeleteYou should be able to. For the 1uF directly above Q6 the positive side should connect to the trimmer next to it, and for the 1uF to the right of Q6, the positive side should connect to the middle pin of Q6 (the source).
DeleteAw thank you so much
Deletefinally i can find the caps. doesnt works with elcos. works fine. beautiful overdrive. thanks
DeleteCan I use this as a preamp?
ReplyDeleteI have built this pedal and I have been impressed with its sound! I want to congratulate you for the excellent work done! Regards!!
ReplyDeleteMy problem is 2N5457 sounds much louder than my J201. I'm confused why because according to the forum, j201 have much more gain.
ReplyDelete
ReplyDeleteHi, I wanted to know if it's really verified? I am going to use smd MMBF5457 to replace the j201, my question is if it is correct that the Q6 will get the 9v directly as a fi gure in the schematic?
Yes it's verified and yes Q6 gets 9v.
DeleteHow connect the pin to the switch select?
ReplyDeleteHello everybody!
ReplyDeleteI tried making tweed '57.
In conclusion, it didn't work.
Only when you play strongly the guitar, noise is a little out state.
Can you find the cause by measuring the voltage of the FET?
regards best.
How do you set your trimpots? How do you calculate de voltaje passing which one and what is the setup correctly for this pedal? I have done a couple of pedals and this works just perfectly but I don't know so much about electronics, so I don't know how to set up this trimpots... Should someone teach me? I'm from Argentina.
ReplyDeleteFor the sw or switch, it use toggle switch on-on with 6 pin?
ReplyDelete