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.



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23 comments:

  1. SynesthesiaJuly 24, 2016 at 8:43 PM

    mole booster doesn´t work fine

    ReplyDelete
  2. UnknownSeptember 8, 2016 at 3:32 AM

    "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

    ReplyDelete
    Replies
    1. Effects LayoutsSeptember 8, 2016 at 7:19 AM

      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.

      Delete
  3. UnknownDecember 13, 2016 at 8:36 PM

    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 :)

    ReplyDelete
    Replies
    1. Effects LayoutsDecember 14, 2016 at 9:20 AM

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

      Delete
  4. UnknownMay 22, 2017 at 11:31 AM

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

    ReplyDelete
  5. UnknownJune 2, 2017 at 9:51 AM

    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.

    ReplyDelete
    Replies
    1. Effects LayoutsJune 2, 2017 at 10:07 AM

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

      Delete
  6. UnknownJune 26, 2017 at 4:43 PM

    Hi! The Mole Hog's Foot is verified? The pcb is ready to print? Or i have to flip it? Thanx!

    ReplyDelete
    Replies
    1. Effects LayoutsJune 26, 2017 at 4:45 PM

      To my knowledge it hasn't been verified, but it should work (I'm pretty sure the LPB-1 has been verified come to think of it). It's ready to print. A scaled pdf can be found in the Transfer Image Library tab at the top of the page.

      Delete
    2. UnknownJune 26, 2017 at 8:31 PM

      Thanx! I want this booster for my bass. You know another booster for bass? Sorry for my questions. Im very noob in this.

      Delete
    3. Effects LayoutsJune 27, 2017 at 9:20 AM

      The Catalinbread Sagrado Poblano Picoso is a good bass booster.

      Delete
  7. UnknownMay 7, 2018 at 8:38 PM

    can i replace the 390R resistor connected in emmitter? and what values can i replace that??
    tia

    ReplyDelete
    Replies
    1. Ricco SeixasJune 2, 2018 at 5:18 PM

      you can use the 330R, or you can use the 330R in series with 47R resulting in 377R that will be almost equal to the original value.

      Delete
  8. Ricco SeixasJune 2, 2018 at 5:21 PM

    works perfectly, recommend using the original transistor, can mark as verified and approved.
    thanks again!!!

    ReplyDelete
  9. UnknownAugust 24, 2018 at 11:34 PM


    Hey, how do I install this on my bass guitar? And how can I omit the volume pot?

    ReplyDelete
  10. jrdnNovember 3, 2019 at 9:01 PM

    @Effects Layouts, I've built this and really is a good volume boost. I made one for my friend and he says, it does boost volume very well but too much low freq is passed and almost no highs are left in the signal. Sounded too full. Too much, that's what he says. What values do you suggest I should replace the resistor and the 100n caps? The one from +9v to collector and the other that goes to ground?

    Thanks.

    ReplyDelete
    Replies
    1. Effects LayoutsNovember 4, 2019 at 1:37 AM

      Replace the two 100n caps with lower values. Use some sockets to audition different values.

      Delete
    2. jrdnNovember 21, 2019 at 6:49 AM

      Okay so now they tried it on a bass with active pickup. Doesn't work, but works well with bass with passive pickups. How come?

      Delete
    3. jrdnNovember 21, 2019 at 6:50 AM

      @Effects Layouts I meant the EHX Mole.

      Delete
  11. Maksound PerúSeptember 17, 2020 at 8:32 PM

    esto no funciona !!!

    ReplyDelete
  12. BMarch 26, 2023 at 10:48 PM

    I created a stacked Mole, with option to remove/adjust high cuts to get a stacked LPB-1 which doesn't attenuate bass on input/output. Been great on my bass, good on guitar too.
    https://www.annabellekhoo.com/2023/03/24/the-deep-double-boost-pedal-for-bass-2n3904-build/

    ReplyDelete
  13. andreas siagianAugust 18, 2023 at 1:22 PM

    LPB works great. I can verify it. I used it for my Blue Box, works like a charm!

    ReplyDelete

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