This is a library of perfboard and single-sided PCB effect layouts for guitar and bass. I'm not an electrical engineer by any stretch of the imagination, just a DIY'er who likes drawing layouts. It is meant for the hobbyist (so commercial use of any of these layout is not allowed without permission) and as a way to give back to the online DIY community.

Friday, August 19, 2016

Wampler Velvet Fuzz

The Velvet Fuzz is a unique fuzz that combines amp emulation and 2 different selectable fuzz tones. The toggle selects between a LM386 (Tight) circuit, and a 2N5089 (Big) circuit. These then push a Plexi Drive circuit that gives the Marshall amp emulation. The modular nature of this design gives you the option to have not only a Velvet Fuzz, but a Plexi Drive in the same box. The board is laid out for board mounted pots and I've included trimmers to help bias the J201 JFETs. I've also included a switch diagram to show how to wire the toggle switches.



32 comments:

  1. where i can get schematic,? Please

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    1. sent to me Email : azep28@gmail.com thank's Sir :)

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    2. Look over on FSB. That's where I got it.

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  2. I intend to take out of this pedal, but, for me, toggle switches wiring is little confusing. We have two switches, right? One is DPDT for changing from "big" to "tight", and another is 3PDT footswith? Well, where to connect "OUT" from volume 2 on 3PDT switch? Where is classic "IN" from PCB? Also, where to connect LED, input & output 6.3mm jack, and what it means: "fuzz in & fuzz out? Where they are on PCB? Also, there is "input" wire on DPDT? Where to find that "input" item on PCB? Apologies to my beginner questions. :)

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    1. Use this kind of toggle switch
      http://tinkersphere.com/buttons-switches/1112-9-pin-toggle-switch-3pdt.html

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    2. Both the switches in the diagram are toggles, not footswitches. The DPDT allows you to bypass the fuzz stages to just have a Plexi-Drive. This is a mod and not in the original. The 3PDT is what selects between big and tight. If you don't want the optional DPDT, the input wire from the footswitch would go to Fuzz In on the 3PDT pictured above, and the Fuzz Out on the 3PDT would go to the Plexi In pad on the board. The rest of your questions can be answered either over on the General Layout Notes tab or with a google search for footswitch wiring. Also if you're new to building effects, you might want to tackle something a little simpler before taking this one on.

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  3. I understand now, thank you very much! I will start to make this pedal as soon as I get all the parts! :)

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  4. Possible to set up the Plexi and fuzz on separate 3PDTs?

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    1. Totally. Use a 3PDT gootswitch instead of a DPDT toggle and use the 3rd row for LED indication

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  5. This baby is VERIFIED! ;)

    The only problem that i had were bad J201, after replacement with new ones, fuzz is vorking like a charm!!! I do not have jet toggle 3PDT switch, because that i connect wires directly. ;) As soon as i get 3PDT toggle switch and led diode holder, i will finish enclosure. ;)
    Pictures:
    http://www.upslike.net/imgdb/plocica-98768c.jpg
    http://www.upslike.net/imgdb/unutrasnjost-e645d4.jpg
    http://www.upslike.net/imgdb/kutija-30d46c.jpg

    P.S. in many schematic, pin 5 of LM has 220n cap, not 1u, so i replace 1u cap with 220n cap... is that o.k.?

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  6. Btw. thank you very much for free PCB images!!!

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  7. Also verified for me (perfboard layout) with the optional dpdt you added. It works very nice, thanks again for this great layout. Also thank you for the dpdt, it's a great idea.

    http://dl.dropboxusercontent.com/u/9520625/20160904_133838.jpg

    http://dl.dropboxusercontent.com/u/9520625/20160904_133641.jpg

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  8. Great job guys! Those builds look fantastic. And Rade, you're right. That 1µ cap should be 220n. Thanks for catching that. I'll update the layout.

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  9. Final look of my build: http://www.upslike.net/imgdb/Wampler_Velvet_Fuzz-30dcdc.jpg
    BTW. great fuzz pedal!!! :)

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  10. Where can we get the schematic from? I don't know what FSB means. Thanks

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    Replies
    1. Freestompboxes.org It's a forum with a pretty good search function.

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  11. I want to connect two 3PDT on this pedal, to change from plexy for big, how would this connection because it still has the exit and the entrance of the tigth?
    Could you help me with this wire connection please great man, tanks

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    1. Not really sure what you're asking... Are you wanting to make the Plexi/Velvet switch a foot switch with LED indication? If so, wire it just like the diagram above and use the 3rd column of the 3PDT for the LED.

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  12. Okay, I want to put foot switch 3PDT, to step, to select the two modes: and the other to activate the pedal, the doubt and which wire to use for input of this switch?

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  13. Great fuzz, thanks!

    http://i.imgur.com/4FvhCGf.jpg
    http://i.imgur.com/jpTicL4.jpg

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  14. Does the gain and tone knobs works when in "plexi" mode?
    Thanks

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  15. Hi.first of all, thank you for answering my previous questions, on this and other layouts.
    I made my first pcb with this layout and now that I look at it, I believe with putted double holes for some componentes, like the 100nf cap next to the trimmer on the left. Is this so we can fit caps of different sizes?

    Also, what values (and where) should I get when adjusting the trimmers?

    Thanks again

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    Replies
    1. Yes, the double holes are different size caps. Set the trimmers to around 4.5v (measure at the drain of the JFETs).

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  16. Hello,

    When i have the switch in Tight mode, i have sound, but in big mode, i don't.
    The crazy thing is that i don't event have audio when probing at the input jack tip (in big mode)!

    WTF? How is this possible? I thought that i wouldn't have audio in the input jack in case it was grounded...


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  17. I had an unwanted solder bridge that was causing the problem,it's fixed now.

    The pedal sound really great, thanks a lot for all these great layouts.

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  18. Super impressed with this pedal. I have a love/hate relationship with most fuzzes but I can't get a bad sound out of this one. Thanks for the layout!

    I worked up a channel switch 3PDT scheme from your offboard wiring for the Grey Channel. Using a blue/green bi-color LED. Opted to leave out the switch to bypass the fuzz section as I have a plexi drive already.

    http://imgur.com/a/lub6m

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