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.

Wednesday, March 2, 2016

Dual Klon Buffer

In an effort to make my own personal pedal board better, I'm building buffers at the input and output of my signal chain. As space and DC jacks are always a premium, I thought to build a dual buffer in a 1590A enclosure. The Klon Buffer is great and since it only uses half of a TL072, I figured I could just use the other half for the second buffer. It's a little tight depending on the jacks you use, but the board is small enough to mount vertically to an inside wall of a 1590A while the wall opposite can mount the 4 input/output jacks. Here's my drilling template to better illustrate.



And here are a few pics of my build.


45 comments:

  1. This is really cool!!!! Have you ever thought of doing this with the Pete Cornish buffer? That would really be cool also?

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  2. educat me, this will be the 1st & last pedal/effect in a box?(patent pending)
    somethhing like that, or not even close???

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    1. Exactly. You'd plug your guitar into the first input, then the first output would go to the rest of your pedal chain. Then plug your last pedal into the second input, and the second output would go to your amp.

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  3. If I'm not mistaken, you only wire a ground cable to one of your jack plugs while the others are left unconnected. Am I right?
    And since I have plenty of TL072s, I surely will build this to see what it could do to my sound.

    awesome as usual, bro.

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    1. Because all 4 jacks' ground are connected through the aluminium case.

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  4. done building this one, my guitar tone gets better
    thanks for this one
    awesome as usual

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  5. If I'd like to make an Y splitter I only have to connect In1 and In2 together?

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  6. just curious... did you put an on/off switch for this one?

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    1. I did not. It's an always on thing for me.

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  7. hello just finished the dual klon but i'm not happy for the sound !
    Is the kind of the 2 1uf is important ? because I've put 2 1uf Electrolytic Capacitors type !! maybe it's for that ? are there tentanium ???

    THX
    Franck

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    1. I used tantalums in my build, but I would think the electros would be ok. You may just need to socket them and see what works better

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    2. ok i'll look tomorrow and let you know ! just another question ! how pedals maximum you can chain ? because have a look on pedal bord please and tell what do you think ! is it a stupid idea ? How do you use with your dual klon buffer plugged ?

      http://www.hostingpics.net/album/FranckyDJ_f-275956.html
      http://www.hostingpics.net/album/FranckyDJ_f-275971.html

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    3. You could put a buffer in the middle of your chain if you feel like there's any signal loss, but having this at the beginning and end of your chain should be ok I'd think.

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    4. ok because it's incredible the lost of sound !!!! I shood and had to resolve why the sound is bad with my work…
      Thanks for your job ! its great ! i can participate for donate if you want !

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    5. It's the same with tantalum condenser !!! Don't know why ? :)
      I've a sound with 3 db less and a little bit crunch ! i will change the tl072 ?

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    6. another question ! The dual klon must be use together or can be use separately ?
      Because when i plug the input of buffer 1 the sound go out of output buffer 2 ! Its strange no ?

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    7. Yeah they're meant to be used independently. And yeah, swap 072s. Weird that you're getting signal loss and distortion.

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  8. all my tl 72 are from tayda ! is there any equivalent ?

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    1. You may just have one bad 072, so try another one. But any dual opamps should work (JRC4558, NE 5532, etc)

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  9. ok ! many thanks for all !
    Let you know when it will work !

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  10. "Weird that you're getting signal loss and distortion."
    Yes because it's a little layout and not complicated ! i have change the tl072 and Doesn't work !
    I've try 4558 but it's not better ! Maybe a mistake with resistor ! I will see at night and tell you !

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    1. no really i can't and don't see nothing ! 100NF 0.1UF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR is that right for the 100 nf ? I think should be ok !?
      Isa you put 510 ohms resistor for the 560 … I imagine it's not important you had to have it on hand … I was happy to see any mistake in my mounting but quickly understood that no !
      Healy i don't see ! condenser made ! can give me the voltage of each pin of the TL 072 ? Maybe a way …

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    2. i had your same problem with the pcb layout, i checked for cold solder joints and bridges, and those were probably the malfunctioning causes because it's now working. here are your working voltages:

      1 - 4,47
      2 - 4,47
      3 - 2,19
      4 - 0
      5 - 2,18
      6 - 4,47
      7 - 4,47
      8 - 8,92

      triple check everything, good luck

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    3. Ho ! thanks you very much ! i'm going to check it at night !

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  11. No say what tell ! very things are ok on my work ! please ave a look in my aim ! i built a power supply who's integrate the dual clone … I don't the cables maybe, the 2 transformers about it ?
    What's happened ? I don't see !

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  12. With corrections
    don't know what tell ! every things are ok on my work ! please have a look on my alim ! i built a power supply who's integrate the dual clone … I don't know, the cables maybe, the 2 transformers around it ?
    What's happened ? I don't see !

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  13. http://www.hostingpics.net/album/FranckyDJ_f-275971.html

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  14. instead 100k, do yopu use 100k? (brown, black, orange)??

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  15. sorry, instead 100k, do you use 10k? (brown, black orange)?

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    Replies
    1. For the Vref or the ones going to ground near the output?

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  16. both!! i just finished but when i check the voltages, they are too low and the volume is so low. what can i do? =(

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    1. For the Vref resistors you can use 2 of pretty much anything. When I built this I think I used 33k for there. For the 100k resistors going to ground near the output I'd stick with that value.

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  17. My voltages are:
    1 - 1.37
    2 - 1.37
    3 - .90
    4 - 0
    5 - .90
    6 - 1.37
    7 - 1-37
    8 - 9.20

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    1. These are pretty low. I think you need to double check your values and possibly just rebuild it. Correct voltages were posted above.

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  18. Hello there! I have a simple question, sorry I'm pretty new at this, Are the jacks all stereo? or wich type of jacks I need? I was thinking about stereo for input and mono for output.

    Thank you.

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    1. You can use mono jacks if you're not using a battery. You really only need stereo jacks if your using a battery snap.

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  19. Hi, can i use 1n4007 or 4001 instead of 5817? Thanks

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    Replies
    1. Yes, though there may be a little loss in voltage (like maybe half a volt). It won't hurt functionality though.

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  20. Hello,

    The idea of this Klon Buffer is to used it in the beginning of the pedal board and in the end ? Because of that, you built it with 4 jacks ?

    In 1 - from Guitar output to in1
    Out 1 - from the out1 to the first pedal of the pedalboard
    In 2 - from the last pedal of the pedalboard to in2
    Out 2 - from the out2 to the amplifier

    Am I right ?

    Thank you very much!

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    1. Sorry,

      You've already answered !

      "Exactly. You'd plug your guitar into the first input, then the first output would go to the rest of your pedal chain. Then plug your last pedal into the second input, and the second output would go to your amp."

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  21. I found this after having the same idea at work today and was looking for good buffer circuits to use. Funny. But I am now curious on how you would combine this with an ISP Decimator G String.

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