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.

Friday, November 4, 2016

Earthquaker Devices Tone Reaper

Happy Fuzz Friday, everyone! This week I give you the Earthquaker Devices Tone Reaper. This got traced over the Tagboard Effects forum, so thanks to Galapagos for doing the leg work. It's based on the 3-knob Tone Bender, with the darlington pair of germanium transistors simplified into a single high gain silicon transistor. In some respects it's similar to the D*A*M GB-83 Greasebox in that respect. An AC176 is used in the originals but others may work. Socket and experiment as usual. The tone control has also been changed to a BMP tone stack. I redrew the schematic for reference:




13 comments:

  1. Tried some old soviet germanium transistors - sounds good. Interesting fuzz. Are there any recommendations as for transistors hfe?

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    1. I'd use something in the 100-120 hfe range for the germanium.

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  2. And one more request - could you make a layout of DB1 here's the link https://guitar-gear.ru/forum/index.php?app=core&module=attach&section=attach&attach_id=7280

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    1. Dude, your link already has a layout in it :D

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    2. Yep, it's got PCB layout. I don't have an opportunity to make a PCB unfortunately

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    3. You can easily transfer this pcb layout to perfboard since it has pretty standard spacings
      ;)

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  3. Populating this board now, I think the pot labels for the level may be flipped?

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    1. Yeah you're right. Just a little typo on my end.

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  4. Do you know any silicon transistors that cpuld replace the ac176

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    1. Something around 100-150 hfe like a 2N2369 could work, but it would sound different. And Russian germaniums like the MP38 are generally easier to get.

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    2. Thanks, I think I will have to do some breadboard versions before building it on an actual pcb

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  5. I used the germanium 2SD30 by sanyo, and it works perfectly.

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  6. I used MP38, sound great but the pedal act like a limiter when I stroke harder the guitar strings. Any suggestions about this behaviour?

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