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.

Monday, November 30, 2015

ProCo RAT Project

Here's the classic RAT distortion with on-board pots. All the ProCo RATs are essentially the same circuit, just with a few value changes over the years. For this project, the board can be used to make 4 different versions of this great distortion box: The original RAT, the RAT 2, the Turbo RAT, and the You Dirty RAT. Here's the basic schematic:


The component names from the above schematic follow those in the layout drawing below.



The project file with a full BOM, scaled transfer images, and drilling template can be found here.

Thanks to Cody for verifying this ahead of time for me. You sir, are a scholar and a gentleman.

27 comments:

  1. I was going to make your old layout tonight.... wow. Thanks man.
    Incidentally, which is your favorite version? Was going to start with the original.

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  2. On this layout I did the Original and a RAT2 and both were rockin! I lean more towards the Original myself.

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  3. Hello Cody.
    I'm going to build the RAT2. Here's a dumb question: what to do about R12?
    Congrats for this great work and thanks!

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  4. im kind a bit have issue thinking with the IC replacement,
    i recognize the small box is the pin 1 of the ic. but it is on the front

    in this tutorial, where do i put IC on slide ? on the face front or on the back ?
    and where should i put all the rest of the components ?

    is the IC is on the front and the rest on the back ?

    Thanks Sir, you are a great person to shared this.

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    Replies
    1. You might be over thinking things a little. All components are on the same side of the board (non-copper side). Components on one side, solder on the other. The only exception is the pots if you decide to go with board mounted ones–they need to be mounted from the solder-side of the board. Hope that helps.

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  5. thanks for the great job !
    there's a tiny mistake, the filter pot is supposed to work backward, so lug 2 should be tied to lug3 instead of lug1.
    keep doin' what you do mate (y)
    Rafik.

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  6. fantastic. I was able to get the perf working. great work you do here man with the layouts. top notch

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  7. 1n4148's? is that a typo by chance?

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    Replies
    1. No typo. 4148s are essentially the same as 914s if that's what's throwing you. And you can put whatever you want there. Use sockets and try out some different diodes.

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  8. i went with 1n914's ..it was the 2N4148 that threw me off. I tried finding a data sheet on them and it kept pulling up 2n series transistors.

    I almost have this one done, no pots on yet and took readings but not sure how to interprete them

    fet is seeing source voltage

    .9 and .2 on the inverting/non pins 2 & 3

    .6 on pin 6

    and pin 7 is seeing Vs as well

    hope she fires up when I get the pots on.




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  9. hello. im trying to build the RAT2, but R1 keeps burning, any ideas of what am doing wrong, using a 7v psu

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    Replies
    1. Sounds like you're using a positive ground psu. You need a negative ground one.

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    2. Hello again. tried 2 more 9v psu's, with the same result, R1 keeps burning. the PDF says 47 or 100 ohm, i had 47 available so thats what i used, any chance i killed something else on the circuit??

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    3. You might have killed D1 as well. Try replacing it.

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  10. Got this built up at the moment on the bench, whats the deal with R12? Do i jump it?

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    Replies
    1. Just don't populate it. I'm not entirely sure why I included it... *head scratch

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    2. Thanks man it just seemed strange as it wasnt in any of the typea! =)

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  11. i must be horribly missing something but where is the component values? i cant see them

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  12. Any suggestions on LM308 replacements?
    I've built the turbo with the OP07 and like it but would like to try something closer to the original.

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    Replies
    1. In my experience with the Rat, nothing beats the 308.

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  13. New to all this, and trying to figure out where the pots are mounted on the board? They're not reflected in the diagram. Also, I assume the switch will be in the General Layout notes?

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    Replies
    1. The pot lugs/legs go the empty pads below the labels at the top of the board (lug 2 is implied).

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    2. I see. More towards the middle of the board?

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    3. I live in the States. What's a good source for quality bulk resistors and capacitors, etc.? Again, new to the DIY so trying to locate quality components I can order all together and not have to piece it all together through five different places.

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