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.

Tuesday, March 24, 2015

Catalinbread Sabbra Cadabra

This pedal is inspired by Tommi Iommi's classic combination of Laney Supergroup amps and a Rangemaster treble booster. It's not an emulator like the Supergroup pedal I posted a little while ago. If you look at the schematic it actually looks like 2, AMZ mini booster-type stages at its heart, with a transistor-based input stage. It also has a fixed tone array before what I'm guessing is a JFET-based gain recovery stage at the output. The originals have MPF4393 JFETs, but socket and try others with GSD pinout (J201, 2N5457, etc). The layout below says to use 9v, but it can also be run at 18v. I've drawn it so you can use right angle PCB pots, mounted from the solder-side of the board if you want, and it should all fit nicely in a 1590B.



12 comments:

  1. I just need my A1M pots to arrive to tag this board verified (or no, haha). Can you do a G2D Morpheus layout? I never found one online!

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  2. this one sounds pretty good, did it with the old layout (pcb), cant get any of my bc182/bc184 to work...finally used a 5088 and made the connection from volume 1 to ground.
    its getting boxed as soon as i sort out graphics.

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  3. Works fine. Used 2N5457 jfets and BC547B NPN which needs to be turned around.
    Sounds good.

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  4. BC184 LC has different pinouts to BC184 ,pins need to be twisted round ,I made the mistake of not having them the right way round.

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  5. has anyone problems like a little gain or fuzz sound? and when changing tha gain from 100% to 50% or below has a cut to the sound like it is being gated very hard? can i have the schematic so i can work this out?? please respond!

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  6. I haven't built one, but the schematic can be found here:

    http://freestompboxes.org/viewtopic.php?f=7&t=25043&p=249151#p249151

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  7. Really enjoying this layout! Finished mine about 45 minutes ago and rocked the hell out of this circuit with my Gibson SG with Burst Buckers. Make sure you check your bc184 pinout since I had to cross a leg since mine had the base on the outside.

    -Cody

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  8. Sounds awesome, Check pinout on BC184LC as mentioned above.

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  9. Could not make it work. Tried twice. Totally changed all jfets and the transistor I'm using is 2n3904 rotated 180deg. All I got is a hum. Something strange happened. When I touch the range pot there's another type of noise, like when you touch the tip of cable plugged in the amp. Any thoughts?

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    Replies
    1. Short answer: Something's wrong with your build

      Long answer: It's been verified by multiple builders. I can't really diagnose what wrong with your build based on what you've said. Double check all your connections with a DMM and reflow solder joints.

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    2. It's working now. I switched the input and output but it sounds awful. Very low gain and some controls like range just don't do nothing when dialed. I will try to bypass the transistor stage.

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  10. I managed to find the transistors MPF4393, but my pedal is very high gain. How can I change to a little less gain?

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