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, June 30, 2015

Electro Harmonix LPB-1 (and its siblings)

The LPB-1 was the first effect made by Mike Matthews and Electro Harmonix. Like many other effects at the time, it was housed in a small box that plugged directly into your guitar. It was designed to give you a volume boost and push the amp into overdriven territory. EHX still makes the LPB-1 (Linear Power Booster) to this day, as well as its sibling circuits, the Screaming Bird (also known as the Screaming Tree) treble booster and the Mole (also known as the Hog's Foot) bass booster. The LPB-1 and Screaming Bird/Tree can be built on the same board, as the only difference between the two is the input and output capacitor values (100n for LPB-1, 2.2n for Screaming Bird/Tree).


The Mole/Hog's Foot is basically the same circuit, again with differing input/output caps. However, there are 2 added 100n capacitors that make it necessary for a different board.



9 comments:

  1. mole booster doesn´t work fine

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  2. "Volume 2 to Out" --> What is the meaning of this? Is the meaning of that is ---> Volume potensio Pin No.2 goes to 3pdt switch pin?
    Anyone who know, Please help me? thanks

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    1. That's correct. In a lot of effects the circuit output is from lug 2 of the volume control. Check out the General Layout Notes for offboard wiring diagram.

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  3. Hello, how i should to connect the wire to led? because in your general layout notes it is just connected to the 3pdt switch. I hope you can help me :)

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    1. Wire the LED pad to the anode (+) of the LED, then wire the cathode (-) to the switch like in the General Layout Notes diagram.

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  4. https://www.youtube.com/watch?v=Mm_oQzdrtFI&feature=youtu.be
    lpb1 + muff fuzz(transistor ver)

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  5. Hello guys. Great page, I like it because it's very simple for begginers like me. But I have one question.. how do i know what transistors and diods to use, not only for this project but othera as well? Other than that almost everything is clear. Thanks a lot.

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    1. The transistors are listed below the layouts. In this case the transistor (Q1) is a 2N5088.

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