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.

Wednesday, May 3, 2017

Frantone Vibutron

Here's another one of my Eagle creations. The Vibutron is a great sounding tremolo from Frantone that uses a ICL8038 to produce the LFO. Originals use a rotary switch for selecting the waveform, but as lvlark pointed out on the Tagboard Effects blog, a on/on/on DPDT switch can be used instead (check out his layout for switch wiring). For you perf builders, this might be a bit difficult to translate to perf (especially with 3 traces under the 8038), but I'm sure one of you out there will make it work. :D This layout has also been uploaded to OshPark if you want a fabricated board–click the OshPark tab above.





Note: Red lines are jumpers

16 comments:

  1. Are you putting this up on OSH? I dont see it listed under the tab you provided. nor does it appear if you search for Vibutron

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    1. Sorry! Forgot to share it. It's there now.

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  2. Awesome! Would you consider putting your first few Eagle boards up on OSH?

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  3. Would it be possible to link the schematic for debugging, because i get only the dry Signal. I used the oshpark pcbs

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    1. http://www.freestompboxes.org/viewtopic.php?f=7&t=17029&p=204378&hilit=+Vibutron#p204378
      Found it.

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  4. Hello! Yesterday I collected it and it does not work, there is a clear sound, the functional works, but nothing changes, I spent the whole night on this problem (
    https://www.dropbox.com/s/j5i8net7mmvf7hi/IMG_20170620_105749.jpg?dl=0

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  5. So i finished the oshpark pcb and ran in some issues. I had to lift pin 6 from icl8038 to get the lfo running, like mentioned in the fsb Thread and the 2n7000 won't switch, because because of to Low voltage. No idea if i have a faulty batch of transistors. But swaping the 100k trimmer for a 500k did it. So now it's working. Maybe the Layout could be altered, for easier lifting of pin 6?i know it's only an issue few people have, at least in the fsb Thread.

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  6. Hi, Managed to build this (oshpark boards). had to lift pin 6 like Samuel. works great, sounds good, I've added the fast switch mod from MArks forum. Very good Tremolo.

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  7. how can i wire it using a rotary switch? tnx..

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  8. This is heroic. Any chance you'll ever do a layout of the Cream Puff?

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  9. very low quality on the picture, cant see the values.
    if i zoom it gets too blurry :(

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    1. Right click on the image, select "Open link in new tab"

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    2. ok I see, thx
      that's a bit better.
      maybe it's not the best color combination to use in first place? ;)

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  10. After 4 attempts of PCB etching from the transfer library I must say that the traces on this one are a bit too thin - I always ended up with a couple of opened circuit traces each time. Shame, as this is a cool example of using the 8038.

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