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 2, 2015

Catalinbread RAH

This one's for those of you trying to nail some Jimmy Page tones. The RAH emulates the HiWatt heads Jimmy used live in the early days of Zeppelin. It uses only 3 MOSFET transistors, and features a 3-band EQ section. I'm going to shut up now so you can hear Andy from PGS put this thing through its paces.





20 comments:

  1. nice! :P

    but how high chance is it that the pcb is okey?
    loads of unverified projects here.

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    1. Stuff is unverified because people haven't built them. If you don't trust me, compare the layout to the schematic yourself.

      http://2.bp.blogspot.com/-bnlTjGc7DfM/T7zg-zA9OPI/AAAAAAAABW8/fXwHxSufzww/s1600/catalinbread+rah.PNG

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  2. I verified a bunch of David's layouts (more than 20, I think) and only one wasn't good, and the fix was pretty simple! BTW, I built one RAH (from my own layout) and it sounds pretty good, very dynamic and amp-like, but I expected it to have a bit more of gain. But still, sounds amazing and it works pretty good with other pedals pushing it.

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    1. E aí, xará!
      O que achou do Bass desse pedal? Esse é o maior motivo por querer construir um desses.

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    2. E aí, xará!
      O que achou do Bass desse pedal? Esse é o maior motivo por querer construir um desses.

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    3. Fala xará! Todos os controles respondem muito bem, e o pedal soa bastante amp like! recomendo!

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  3. E aí, xará!
    O que achou do Bass desse pedal? Esse é o maior motivo por querer construir um desses.
    this means:
    "Hey Bro! What do you think about the bass tone of this pedal? This is the greater reason that make me wish to build one"

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    1. Back in the day there weren't all that many bass specific amps. I'm sure this thing could sound great with bass, though some of the capacitor values might need to be adjusted/increased for better response of that frequency range.

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  4. It works as is, but to get to anywhere near unity with an amp the master has to be cranked on the pedal, should something be changed?

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  5. nevermind. After some research, this pedal is doing exactly what it should be doing.

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    1. Yeah, it's not a loud effect. It really comes alive though with a boost in front of it. Check out what Cody did with a Rah clone earlier this year.

      http://music.codydeschenes.com/?p=2844

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    2. Cool, Thanks!

      Should have the SD-1 verified in the next couple days.

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    3. has anyone tried playing with the resistor values for added gain? or even tried a b1m gain pot?

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  6. Is there any equivalent transistor, that can replace the bs170?

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    Replies
    1. Try the 2N7000. You'll have to rotated it 180º for the pinout, FYI

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  7. This comment has been removed by the author.

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  8. Hello, I´ve just finished the RAH but I have a problem.
    Before putting it in a enclosure with its 3pdt I tried it and it sounds, but with very, very little volume.
    You can´t almost hear it. The treble, mid and bass controls seem to work
    The master also acts, and it seems that the gain also, although the latter is not very clear, since, having so little volume, I do not appreciate it well.
    If someone could tell me where the fault may go I would appreciate it. I'm new in this DIYer world and I've tried everything I can think of.
    Please forgive my English. Part is mine and part of the translator, and I think neither of us are very good

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