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, August 26, 2015

BigFoot Fx MagnaVibe

The MagnaVibe is a vibrato effect inspired by the built in effect on old Magnatone amplifiers. From the BigFoot Fx description:

The Magnavibe was inspired by the early 1960's vibrato guitar effect (not the typical tremolo which is just pulse modulation). The Magnatone amp was known for having that amazing wobbly sound. Setting out to put that type of sound in a box and use it with any amp took much experimenting. The results are excellent. This is not a plain one dimensional vibrato such as a chorus pedal with the dry mix removed. Delay chips weren't even used back then. Nor is it just another uni-vibe clone, but a unique sound with that classic unique tone. Adding spring reverb or delay after the vibrato sounds especially good.

I've drawn it so there's space to use a VTL5 or similar photocell, or you can make your own. Either way, theres space for it. A lot of layouts I've seen don't allow for a comfortable enough space to get the LDR and LED lined up nicely. You might even be able to get this to fit in a 1590a.





14 comments:

  1. How are we supposed to print out the toner transfer the correct size? Would it be possible for you to add a scale or even better, a PDF 8.5x11 that we could use to print?

    Thanks!

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    1. Way ahead of you. Click the tab at the top of the page called "Transfer Image Library" and look in the "Misc" folder. Check out the "General Layout Notes" tab for more info too.

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    2. Well then excuse me! You sir are awesome! Keep up the great work!

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    3. No problem. Let me know how your build turns out!

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  2. is there anyone here who built this and verify it as working?

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  3. what's the value for ldr and color and size of led?

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  4. This one is verified. Start with a 1M dark LDR and a 5mm red LED. Not a bad idea to socket those 2 components though.

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    1. i built this one and works fine.. but the vibe is not that good maybe it's because of the ldr and led i use.. i'll try to use you're recommendation though.. thanks anyway.. =)

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    2. The PCB is perfect.
      I've breadboarded before boxing and the sound was pretty close to the original. 5mm red LED and LDR (unknow specification). After putting it into the enclosure I missed some intensity, mainly when the knobs are at maximum. Maybe it's the insulating tape wrapping the Led and Ldr, maybe the position of both. Trying another one soon.
      Thanks again, dtgehrin.
      http://guerrilhamusic.blogspot.com.br/2015/09/guerrilha-vibe.html

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  5. thank you very much, Sir
    Really beautifull work
    cheers

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  6. This comment has been removed by the author.

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  7. Can it slower speed increasing the pot value to 50?

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  8. Sounds great!
    Some suggestions:
    - 470nf caps for more speed, and 2.2uf for slower speed instead 1uf in both caps under the transistor.
    Polarised or not, the same: I put 470nf and swith to add 1uf in parallel to have both speed ranges.
    - BC548 or 2N3904 works fine.
    - Cut trace between 100nf cap and the LDR, and put there 10k pot as variable resistor to get more tremolo like wave.

    Thanks!

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  9. If i put a mix control(dry signal) can i get kinda chorus effect?

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