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, January 23, 2015

Simple FET Blender

Here's a simple blending circuit that uses a JFET to allow you to blend between effected signal and clean signal. I've used this on Big Muffs before and it's quite useful.


19 comments:

  1. I tried to use this with my populated Blower Box and I am getting phasing issues at 50% blend. The volume of the clean and effected are dropped to almost nothing. I used a J201. I am wondering if a split and blend would work better. thoughts?

    Cody

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  2. Never had phasing issues with it on the 2 pedals I've added this to. Wonder if there's something with the RAT-based circuit that just doesn't play nice with with this one. This is a rather simple blender, so a more complex one (maybe the Run Off Groove Splitter-Blend?) with buffers and whatnot might be better suited for the Blower Box.

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    Replies
    1. Thanks, I will play with it some more tonight. I populated a split and blend to give it a try also.

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  3. Verified, just made up 2 of these for Big Muffs and they work great! Thanks!

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  4. If I want to make one of them - blend and affected pedal - always on, which one would be better bro?

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    Replies
    1. Not quite sure what you're asking... Do you want to make a pedal that has this instead of a footswitch?

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    2. I don't see why not. Though you might want to try the Split n Blend. This one can cause some unwanted phasing. Just depends on the circuit you're trying to blend I guess.

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    3. just want to add this to my big muff

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  5. Can I use 2SK30A instead? I knowthat has different pinout.

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    Replies
    1. I think it'll work. Socket just in case.

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  6. this works really well.
    i modded it after my true bypass switch so i can have clean sound.
    it works well but there is a large noise when i press bypass. i thought maybe a capacitor on the bypass will solve it.
    any thoughts?

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    Replies
    1. You may need to add a pulldown resistor between input and ground. Start with 1M value.

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  7. Hello, I did it. it works. I have a question. When I set the potentiometer to 0, the clean signal is much quieter than if the potentiometer is twisted by 100%. Should it be or did I do something wrong?

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    Replies
    1. What effect did you add it to?

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    2. I used it as a separate pedal for mixing pure signal and fuzz

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    3. Generally the fuzz is going to have a much higher volume than your clean tone. To get things to unity, turn the volume of the fuzz down.

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