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, June 8, 2018

EarthQuaker Devices Dirt Transmitter

To close out EarthQuaker week, here's the Dirt Transmitter. I traced this one myself and below is a video showing the process. It's similar to a Fuzz Face, but a little different. I found this description from (I'm assuming) Jamie over on TGP:

I guess it's kinda like a fuzz face but it started as two gain stages running into each other with an input gain control and a sag on the second stage (bias). Voltage feedback was added and it became similar to a fuzz face in topology but it sounds nothing like one IMO. In this case the sound is totally dependent on the transistors, replace them and it's a whole different beast.


Here's my video on tracing the circuit as well as a demo:


   

Here's the schematic:


And the layout:


You can also order a fabricated version in the store here.

Update:

Added a perf layout for this based off the Eagle board above.

20 comments:

  1. Wow, well done! You are a treasure for DIY community!

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  2. You're a stud, David! Thank you for all you do!

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  3. Epic post. I already ordered some components. 🙃😬

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  4. just an FYI. on your perf layout the 100p from the base to collector of Q1 should be a 470p according to your schematic and your top layout.

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  5. built it. verified! it sounds awesome. thanks for drawing up the layout!

    http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/DirtTransmitter/DirtTransPCB-01.jpg

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  6. here's pic pf my finished build:

    http://johnkvintageguitars.homestead.com/Effects/Fuzz-ODs/DirtTransmitter/DirtTransmitter-600.jpg

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  7. Awesome job.. good video! Good to follow you!

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  8. Friend how do I leave the value of the components on top of them? how does this layout. I use Eagle 7.6.0

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  9. Hey there, I'm having trouble finding the 2n1711 transistors anywhere, are there any alternates? Thank you so much great help !!

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  10. Hey david can you show a diagram that shows how to wire up the dirt transmitter. Thanks

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    Replies
    1. Was there a special way that eartquaker wired up the 3pdt

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    2. Not really. Their method is about as simple as it gets. And they don't ground the effect input when it's in bypass mode (which is generally a good idea). Just use the method laid out in the General Layout Notes tab and you'll be fine.

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  11. Ok so iam about to populate my pcb that I ordered from Oshpark which are amazingly built. I just wanted to know which caps should I use? Multilayer ceramics, polyfilm, or box? I have all the values in the multilayer ceramic but I wanted to make sure before I solder. Thanks

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    Replies
    1. You can use whatever you want. The original used a mix of film and box, but I've got not hing against multilayer ceramics.

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