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, May 25, 2015

JHS Morning Glory

The JHS Morning Glory is a modified Blues Breaker overdrive, but with an added JFET output buffer to increase the volume. The original Marshall circuits barely made it above unity with the volume maxed (see the video below), so the output buffer is a good improvement over the original. There's also a high cut switch to help tame single coils a bit. I wasn't quite able to get the on-board pots to be in the exact layout as the JHS units (the Tone control and High Cut switch are reversed), but it's close enough. You should be able to board mount the SPST high cut switch as well.


50 comments:

  1. Hey man, I see that the 10nf capacitor between the First pin from the Tone control goes to ground after. Searching around the web I found this schematic and the same capacitor goes to "VB+", not to ground, so the schematic is wrong or this layout? Thanks https://scontent-mia1-1.xx.fbcdn.net/hphotos-xpa1/t31.0-8/11221912_886219964747403_2666280907683882631_o.jpg

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    Replies
    1. You're right. Nice catch. Fixed the layout and it should be good to go now.

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    2. Can you upload the new PDF for this PCB?
      Thanks

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    3. Sorry about that. Should be good to go now.

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  2. Hi man, the effect has low volume, this isuue is solving changing the 68k resistor for 100r, this solve the problem.Bye!

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    Replies
    1. 100ohm. "r" typically means ohm for some reason.

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    2. Thanks man, there are other error in the diagram? This are my first steps in this, sorry for my inexperience and thanks a lot for your job, your diagrams are really simply to understand and you do everything so simple for me. Great job!! And i want to know, if I ask for other pedals you can build it? Once again great job and thanks a lot!

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    3. The layout's been verified, so it should work. I'm open to suggestions for future posts, but please include a schematic.

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    4. Hi, is what's the final value of this resistor? Or it depends on the fet?

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  3. Hello i´ve seen the error but can you please upload the new PCB for the circuit
    because stills being the same
    Thanks

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  4. Hello again
    but i have some issues with this it sounds very low and i cant hear the fx of the pedal
    i checked a lot of times the layout and everything is ok the solders etc.
    please help me

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    Replies
    1. Could be a bad/wrong component. Double check your values and it still checks out, use an audio probe to figure out where the issue is.

      http://www.diystompboxes.com/pedals/debug.html

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  5. Is the spst switch using in this layout the regular one? Or there is something different?
    Thanks buddy

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    Replies
    1. I mean used. Excuse my bad English..

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    2. Not really. You can use a board mount switch if you want, but any on/off SPST should work just fine.

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    3. final check before I start building it, is on/on switch can be used here?
      thanks brother

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    4. Yes it'll work. Now I'm gonna drop some knowledge on you

      https://learn.sparkfun.com/tutorials/switch-basics/poles-and-throws-open-and-closed

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  6. can i ask where can put number 2 knobs connection in board ? i cna only see 1 and 3? thanks

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  7. hi, do you have a layout for the twin twelve of jhs?

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    Replies
    1. No. But if you can find a schematic for it, I can make one.

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  8. hi there im wanted to build BYOC looper can you check my DIAGRAM? im confuse about if it will work , i cant find any diagram so i draw it on photoshop

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  9. i have finished building this and everything works perfectly okay except the loud noise...
    is it normal?

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    Replies
    1. Yeah, that's not normal. Time to pull out the audio probe

      http://www.diystompboxes.com/pedals/debug.html

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    2. done!
      thanks man.. new knowledge, new pedal.
      thank you

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    3. perfecly brother, perfectly.

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  10. Noob question but what part is the GSD?

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    Replies
    1. That's the JFET (Q1), and the letters mean where Q1's legs are going: Gate, Source and Drain.

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  11. pregunta de principiante .... en el circuito actual tiene que corregirse aun el problema del 68k a 100r?

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  12. http://s32.postimg.org/49be1nehh/IMG_1043.jpg

    http://s32.postimg.org/g9s8omwid/IMG_1044.jpg

    I am starting to get better at etching ..still on starter toner, 60 bucks for new one ...oh my

    I have it working but to get overdrive it needs to be at 10 and then it squeals ..switch is doing nothing at all

    im proud of my etching skills and have done two working perfs from here, so I am starting to get better!

    I wish this one would get going for me

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  13. i'm a beginner, in pictures above, why some capacitors (green) has 3 holes to put on instead of 2? would you help me explain the reason? sorry my bad English, thank you

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    Replies
    1. That's due to size. Film caps generally span 3 holes, sometimes 4 with large values (mainly if you're using the green mylar caps).

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  14. First of all, i looove ur site and am very appreciative that you've made these great projects available. Now, in this layout I notice a couple potential issues. 1.)The 10n nearest the input pad doesn't have a corresponding pad for the lead that is on the same trace ass the other 10n below it. 2.) One of the 100uf caps (bottom) has the - lead on the 9+ bus instead of ground. That's a problem, right!??

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    Replies
    1. Regarding the 100uf cap, I see the layout follows the schematic by irmcdermott precisely. But does it make sense electrically? Perhaps the schematic is wrong...

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    2. Fixed that missing pad. Thanks for catching that. That weird 100uF cap is apart of the original pedal. I'm not really sure why it's there either and it would work fine without it most likely. The layout has been built by several people and does work, so build with confidence.

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  15. I think I found another missing pad for the first diode (4001) ;)

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  16. info about switch:

    A single pole switch can't be on-on, it's either making contact or not. So a SPST switch is a simple on or off contact, a SPDT switch makes two contacts with a common, like this:

    1
    2
    3

    2 is the common so the switch either makes contact between 1 and 2, or 2 and 3.

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  17. will 2n5458 work instead of 2n5457?
    because 2n5457 is hard to find around my country.

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  18. hey man..as i did some research,, i found that the JHS used WIMA capacitor..is it true?
    if so,, what's the capacitor value?
    (sorry..i'm just a beginner)

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    Replies
    1. No idea what manufacturer JHS uses for their caps. Shouldn't really made for cloning the pedal though. Use what you can get your hands on. Caps all do the same thing no matter who makes them.

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    2. by the way,, LM833 is similar to LM833N, LM833NG or LM833P? which one is the best?

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    3. Any of those should work just fine.

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  19. Hey Guys
    Does anyone have the revised and verified diagram of this pedal?

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