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Thursday, September 14, 2017

Wampler Sovereign

Here's another Wampler take on the JFET mu-amp design. This one adds a op amp stage at the output and features a Big Muff-style tone stack. This one's pretty versatile and a great sounding distortion. Ian sent me his perf layout of this one and I refined it a bit for what you see below, so a special thanks to him. Schematic can be found over on FSB.


21 comments:

  1. you are ... the stomp boxes prophet ``!!

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  2. You can mark it verified! The only thing I changed was the Mids pot, I connected lugs 1 and 2 to the 33nf cap and lug 3 to ground. It should work either way though.

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  3. I etched the pcb a while ago and just yesterday i populated the pcb. At first it does not fired up and after debugging i found our that the Gate on the Q2 is not connected on the pcb side. Now its working good.

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  4. Any schematic and parts list for this one?

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  5. Hi David, how are you ?
    What job do the 50k trimmer exactly ?
    How i have to adjust it ?

    Thx

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    1. It's biasing Q5. Set it so you get about 4.5v on the drain and then adjust by ear if necessary.

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  6. ha ok i understand now why i have this sound like very compressed !!! :)
    Ok thanks for always respond us ...

    Franck

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  7. is there a schematic to this? that would be nice, thanks!

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  8. Verified, but it haven't that amount of distortion what i expected from yt demos. Anybody have similar impression? Q5 biased on 4.4v

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    Replies
    1. The same thing happens to me, it's like a soft overdrive

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  9. How about the Dracarys? Is there any chance of seeing it here? it would be great!

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  10. Good day to all. Refer to the diagram indicated in the top of the article is currently not available. Please tell me where else to find the scheme.

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    Replies
    1. Haven't found the schem anywhere else, and FSB is down. Hopefully it'll come back...

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  11. Fantastic. Super sound. Like a good amp. I used 100k for biasing and had some problems. Use 50k for fine biasing. Adjust sound just before compressing. Good luck.

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  12. Hi! What is the voltage measurement from ground to drain to set the trimmer resistor? Thank you

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    Replies
    1. Got the answer from previous comment ... thank you

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  13. Would there be any problem if I use electrolytic cap nonpolar to 1uF ...or mylar?

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