Monday, 19 September 2022

EHX Muff Fuzz - Op amp version

 The last layout for a while, I honesly don't know when the next one will be uploaded, probably in january. There is three eye surgeries on the horizon...

Anyway, I had athe change to trace an old EHX Muff Fuzz of the op amp variety a few weeks ago. As you know, EHX used parts whatever they had on hand in the 70s so there is lots of different schematics online so I have included several options for some of the values.

My unit had a 1458 op amp, silicon diodes, 47nF for C1 and 100k for R7.



21 comments:

  1. Good luck! You've definitely left more than enough layouts to work on until January. Thanks for all the hard work!

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  2. I hope everything goes well and wish you a fast recovery!

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  3. Thanks tenfold for all of your contributions Anders, it means a lot! Working on these builds keeps me and others sane. Hoping for a quick and full recovery.

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  4. Yeah, take care and I hope everything works out well. Speedy recovery!!

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  5. Heal well and fast my friend. All the best.
    Matt

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  6. Good luck, you'll be missed! I've been slacking on building lately so I gotta play catchup anyway.

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  7. Whish you the best Anders, take your time and be safe

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  8. Hi, sorry that it post my request here but i couldn t find a way of sending a Mail to fuzzhead. Could you or anyone else create a veroboard Design for a dod fx65 Chorus? I finally found a correct schematic. You Just let me know whether you re interressted and ll send you the schematic.

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    1. Upload the schematic at freestompboxes, please.

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  9. All the best Anders. Thank you for everything you do😊

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  10. Rest up and heal Anders. Enjoy the break. We appreciate you

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  11. Thanks for all your posts. Always interesting and inspirational. And get Well.

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  12. All the best mate. Three eye surgeries- have you been looking at the screen too much? ;-) You’re a layout machine.

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  13. Best of luck with the surgery and thank you so much for what you do for the DIY community!

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  14. Wishing you flawless surgeries and a speedy recovery. All of us are eternally grateful for all you have done and looking forward to all that the future holds! Be well soon.

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  15. Wish you a speedy recovery! Thanks for everything you do for this community!

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  16. This Muff is verified is anyone fancies building. Used a 500K trimmer for R7, 10n for C1 and silicon diodes. Sounds good and very loud.

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  17. How does it sound compared to the normal op amp muff? I'm guessing it's kinda like a one knob muff since there's no drive and tone stack, and I assume only a pair of diodes compared to the op amps 6 otherwise volume drop would have neen too much.

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    1. Its probably closer to a DOD 250 than a Muff

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    2. You weren't kidding.... The circuit layouts are very very close.

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