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.

Thursday, April 11, 2019

Greer Amps Lightspeed

Wondered about this one for a while (but always suspected it was YATS). The best way to describe the Lightspeed (that I can think of anyway) is it's kind of like a Timmy with the bass and treble controls fixed and a simple treble cut tone control added just before the volume pot. The most interesting thing with this is the clipping, with 5 diodes in asymmetrical orientation (3 going one way, 2 going the other). Should fit in a 1590B or 125B nicely with board mounted pots.


23 comments:

  1. Replies
    1. The Timmy's one should be easily available online. Start from there

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  2. Wait, was it degooped? The lightspeed topic on FSB is dead since 2016 and DIYstompboxes never had one. That said, part count does match this pic https://images.app.goo.gl/Pwj37eYeH2np5nkC6

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  3. Schematic from the PedalPCB build doc for the "Mach 1"

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  4. I think that this is a much better demo for the device
    https://youtu.be/paIp0B-VI4M

    And I already started to build it because of Rabea's demo

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  5. BOM DIA, O NE5532 funcionar√° legal para substituir o OPA2134?

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  6. I was already hoping someone had the nerve to ungoop the pcb and trace it. And here it is, thank you! And verified! Take notion though that the freq pot should be mounted in the opposite way in relative to the other two pots. In the layouts it says 1 2 1 which is a bit confusing. The 1 at the right should be the 3d lug. Smooth sounding pedal!

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  7. the diode 1n4007 can be used the same way in the layout as the 1n5817? thanks

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  8. Replies
    1. of course, that should works great! in mine i tried 4558 and 1458. the 1458 was my choice more angry open sound! thanks.

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  9. I built it but have a squeal happening when drive and loudness reach a certain point with each other - when the drive is full up, the loudness will cause squeal when about half way. the same happens when the drive is lower but the loudness is higher. Anyone else encounter this?

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  10. Anyone have the gerber file of the PCB or the vectorized design of greer amps? Thanks

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  11. Hi.... where do you solder the ground from the pcb? Thx

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  12. Works like a charm and sounds amazing! I built mine with a 4558D chip, works fine. Thanks for the layout, this was my first vero build and it worked fine without any troubleshooting.

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  13. Noak -- I have a question about a Positive Grid amp model that you created. Please email me. thanks -- Ted

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  14. Can I replace the 1uF capacitor with a polarized electrolytic one? Thank you

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