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.

Thursday, July 16, 2015

MI Audio Crunch Box

Got several requests for this one. The MI Audio Crunch Box is a versatile distortion box, designed to sound like a cranked Marshall. It's very similar to the Marshall Guv'nor, but with a Rat style tone control. Production models have the Presence control as a trimmer internally, but it makes sense to me to have it externally.




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86 comments:

  1. CharlsRTJuly 16, 2015 at 3:00 PM

    Thank you ver much man, you are the bes! :D

    New Proyect! :D

    ReplyDelete
  2. MaurusAugust 9, 2015 at 10:01 PM

    Verified!works ok!even the presence knob, i use tl082.

    ReplyDelete
  3. ZoedroonSeptember 1, 2015 at 7:07 AM

    Build it with TL072 i have trebly and crunch/crisp tone, when i replaced with NE5532 it produced warm tone but still high gain! Thank's for the layout, you're the man!

    ReplyDelete
  4. MayOctober 12, 2015 at 6:53 AM

    Dear friends, sorry for the stupid question. What should I do with volume 2 and 3, and presence 2?
    Thankful.

    ReplyDelete
  5. UnknownNovember 3, 2015 at 3:44 PM

    Someone have the 3pdt wiring ? Or have some ideia about what happens? because i'm trying but, in bypass mode works, when I "turn on the distorition" the pedal dont work.

    ReplyDelete
    Replies
    1. dtgehringNovember 3, 2015 at 4:03 PM

      There's 3PDT wiring in the General Layout Notes tab.

      Delete
  6. UnknownNovember 4, 2015 at 8:14 AM

    I made this model using 3pdt easy wiring, but only the bypass works, and, when I "turn on the distortion" the pedal dont works, do you have some ideia about how can I fix it?

    ReplyDelete
    Replies
    1. dtgehringNovember 4, 2015 at 9:14 AM

      This is a fairly common problem. I run into fairly frequently myself. It could be an issue with your off board wiring or a problem with the circuit board. Have you checked it over with a multimeter?

      Delete
    2. UnknownNovember 4, 2015 at 11:23 AM

      I'll make all again.

      Delete
    3. BerkicauDecember 9, 2015 at 10:49 PM

      hi there, I faced the same problem here... I already made it twice and I got the same result, no sound at all, while the led indicator was on. it also happened in the bypass mode.
      any idea what was happening to my build?
      also, is there any specific position for the two 5mm leds? its + and - pole perhaps?

      thank you man, your site have brighten my days!

      Delete
    4. Effects LayoutsDecember 10, 2015 at 9:40 AM

      Sounds like an offboard wiring problem, so check all that. As far as diode polarity, the negative side of D1 is on the right, and D2's is on the left. The flat side of an LED indicates the negative (cathode). On all my the pcbs the square pads indicate the negative side of a diode. Hope that helps.

      Delete
    5. BerkicauDecember 10, 2015 at 12:13 PM

      ah...
      I hardly see the flat side of the led...!
      thank you sir,
      I'll re-wire my led.

      Delete
  7. Lord_dokiNovember 5, 2015 at 12:18 AM

    very versatile high gain soooo crunchy and way better than krank dm .... but thats just my opinion
    @dtgehring thanks a lot for the layout

    ReplyDelete
  8. UnknownNovember 9, 2015 at 8:45 PM

    I accomplished, but the result was the same as Mopheus said at the top of the page. I'll try his solution.
    thanks Bro, you're the man! =D

    ReplyDelete
  9. UnknownNovember 12, 2015 at 5:29 PM

    I replaced the ic, but I'm having problem with the gain.One doubt: - there's problem if the leds be "high bright" ( I don't know how do you call in english)

    ReplyDelete
  10. dtgehringNovember 13, 2015 at 9:18 AM

    I don't think having high/super bright LEDs would matter too much. But I could be wrong there... Have you tried using different diodes in there? Smaller LEDs, 1N4148s, etc.

    ReplyDelete
    Replies
    1. UnknownNovember 15, 2015 at 7:09 PM

      I'll try smaller leds and diodes. I think so strange, the gain don't change, is Always low. The pot is working well. Thanks bro!

      Delete
  11. BerkicauDecember 10, 2015 at 9:23 PM

    a dumb question... what is meant by B.O.M. ?

    ReplyDelete
  12. UnknownDecember 29, 2015 at 10:22 AM

    Work ok.

    ReplyDelete
  13. BerkicauDecember 30, 2015 at 12:48 AM

    am I the only one who attempted to build this one three times using perfboard and failed all of them?
    big lol
    I'll keep on trying for the forth times, fifth times and on till I hear a sound comes out of it. this is my most wanted effect pedal.

    ReplyDelete
    Replies
    1. UnknownSeptember 20, 2021 at 8:50 PM

      If it has failed you so many times is it due to your errors, how do you explain that others, how I using the same circuit has worked? 'You keep making the same mistake in all your fabrications, to review and keep learning.

      Delete
  14. BerkicauJanuary 14, 2016 at 8:51 AM

    DONE!!! FINALLY..!

    MOVING ON TO JHS MORNING GLORY

    ReplyDelete
    Replies
    1. Effects LayoutsJanuary 14, 2016 at 9:30 AM

      Yay! Congratulations! :D

      Delete
    2. BerkicauJanuary 14, 2016 at 2:41 PM

      this is my fifth attempt, and it's worth it.
      thanks to you, brother

      Delete
  15. Effects LayoutsJanuary 14, 2016 at 9:38 AM

    Thanks Daniel!

    ReplyDelete
  16. Marcello M.June 3, 2016 at 5:06 PM

    Hi. I builded this and works fine, but sounds a "ploc" when I press the 3pdt. Can you help me? If I put a 1m resistor in the in, can I resolve it? Thanks a lot.

    ReplyDelete
    Replies
    1. BerkicauJune 4, 2016 at 2:49 AM

      perhaps it can be solved by soldering a 100k resistor from output to ground.. just like what happened to deep blue delay

      Delete
    2. Marcello M.June 5, 2016 at 11:40 PM

      Thanks for the answer. I'll try it.

      Delete
  17. UnknownJuly 5, 2016 at 10:30 AM

    Sounds great. Thank you!

    ReplyDelete
  18. ChrisOctober 28, 2016 at 2:53 AM

    Newbie here
    Just want to try simple circuit first
    It works fine. But the distortion is set to max but it sounded like a crunch distortion (yeah i know its crunchbox) but doesn't it suppose to give a high gain dist? I know because I have tried an original CB before way too different than mine. If I lower down my gain knob about 2-3 o'clock theres no distortion at all and leds are not lighting up as I hit my guitar
    Some parts that I use (due to available parts that I have)
    2 100pf monolothic ceramic
    Gain knob - 100kA

    ReplyDelete
    Replies
    1. Effects LayoutsOctober 28, 2016 at 8:32 AM

      Since you're using a log taper pot (A100k), the control of the gain is only going to be in the last third or so of the pot's turn. If you use a linear taper pot (B100k) the sweep will be more consistent and you'll have more control over the gain. As for the LEDs, in this set up they're being used as clipping diodes, not light sources. So they're not always going to light up.

      Delete
    2. ChrisOctober 28, 2016 at 10:08 PM

      Ill try to get some linear pot instead.
      Thank you

      Delete
    3. ChrisOctober 29, 2016 at 11:21 PM

      Here's an update on my build. Got a linear pot (B100k) for the gain and you're right i got now a better control on the gain but I still dont get a high gain out of it. Slight/crunch distorted sound from it. Its more of an overdriven kind of sound not a distortion kind of gain. Do I need to get a ceramic caps for the Pf's instead of monolithic? And some of caps were used are wima and polyfilm. Does it matters?
      Thanks

      Delete
  19. ChrisOctober 28, 2016 at 11:26 AM

    This comment has been removed by the author.

    ReplyDelete
  20. Ian NNovember 22, 2016 at 3:23 AM

    Built this and it sounds great! However, it's quite loud, and I'm getting a fair bit of noise with the gain knob at full. Any ideas on what might be causing that?

    Also I noticed there is a missing link in the layout. The layouts on the right show a link between the 1M resistor connection to pin 3 of the IC, but the layouts on the left don't have it.

    ReplyDelete
  21. Ian H NelsonNovember 22, 2016 at 3:05 PM

    Oops, meant pin 7 not pin 3.

    ReplyDelete
  22. fredDecember 23, 2016 at 9:14 PM

    Hi, brother I dont have b20k pot for presence. I have a w20k pot, Can I use?

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    Replies
    1. fredDecember 23, 2016 at 9:34 PM

      I have too a b10k. which one work better for presence? w20k or b10k ?

      Delete
    2. fredDecember 25, 2016 at 2:04 AM

      nobody?

      Delete
    3. BerkicauDecember 26, 2016 at 2:32 AM

      Try both of them, find one that suit you most. As easy as that

      Delete
    4. UnknownJanuary 19, 2017 at 2:25 AM

      its used as a single resistor adjustment not a blend . That means you should use the 20k because you can set it up to 20k instead of just 10k. I like it set at about 8k personally but the original version one used just a 10k resistor for that .i would never set it all the way up but its a nice feature especially if you use a fuzz peal before it to get some of the high end back.The presence is nice all the way up to about 14k for my taste . i set it between 7 and 12 k and 8k is the sweet spot with my strat

      Delete
  23. meandtheothersidesApril 11, 2017 at 3:46 AM

    can I replaced LM833 with LM308?

    ReplyDelete
    Replies
    1. Effects LayoutsApril 11, 2017 at 9:41 AM

      No as the 308 is a single op amp and the 833 is a dual op amp. You can use a TL072, JRC4558, or other dual op amp though.

      Delete
    2. meandtheothersidesApril 18, 2017 at 3:15 AM

      Ok, thanks for suggestion, i'll try

      Delete
    3. meandtheothersidesApril 18, 2017 at 3:15 AM

      Ok, thanks for suggestion, i'll try

      Delete
  24. SupriawanApril 12, 2017 at 5:06 AM

    i'm not find a 20k potentiometer. can i use 50 k ?

    ReplyDelete
    Replies
    1. Effects LayoutsApril 12, 2017 at 9:34 AM

      Use the 50k, but solder a 33k resistor across lugs 1 and 3. This will make the pot 20k.

      Delete
    2. SupriawanApril 12, 2017 at 10:47 AM

      thanks bro .. you are the best bloggers always answer reader questions .. if I may ask again if i use 50k for replacing 10k does this work?

      Delete
    3. Effects LayoutsApril 12, 2017 at 10:51 AM

      You'd have to adjust the value of the parallel resistor. Google parallel resistance. Though the taper might be off since the circuit calls for a rev log 10k. YMMV

      Delete
    4. SupriawanApril 12, 2017 at 10:51 AM

      what is your facebook name.. i will send a some picture ..i don't understand how to soldering the resistor place

      Delete
    5. Effects LayoutsApril 12, 2017 at 10:57 AM

      facebook.com/effectslayouts

      Delete
    6. SupriawanApril 12, 2017 at 11:06 AM

      thanks brother.. :D

      Delete
  25. GuilhermeJune 14, 2017 at 5:21 PM

    Hey Buddy! I'm building the perfboard layout and just caught a mistake. The 1M besides the 470r resistor is going nowhere. In the PCB its right

    ReplyDelete
  26. TanzkiztraJune 16, 2017 at 2:57 PM

    how to reduce noise , if I set dist gain knob more than 12'oclock... its noisy

    ReplyDelete
  27. TanzkiztraSeptember 7, 2017 at 12:17 AM

    worked fine, can I reduce volume range? becoz too loud, I cannot set 12'oclock volume from this pedal, its very loud, any remedy?

    ReplyDelete
    Replies
    1. BerkicauSeptember 8, 2017 at 5:55 AM

      try lower value pot for volume. perhaps b10k or b50k
      the noise can't be reduced I guess. hi-gain distortion comes with noise everywhere haha

      Delete
  28. UnknownOctober 15, 2017 at 1:52 PM

    Hola en qué tamaño debería imprimir el PCB para transferir ?

    ReplyDelete
    Replies
    1. Effects LayoutsOctober 16, 2017 at 9:25 AM

      Busque en la pestaña Transferir biblioteca de imágenes en la parte superior de la página

      Delete
  29. UnknownOctober 25, 2017 at 9:57 AM

    C10k es imposible de conseguir en mi país jajaja cual recomendas como reemplazo ?

    ReplyDelete
  30. UnknownOctober 25, 2017 at 9:58 AM

    Holaaa effects layouts, no logro conseguir el potenciómetro de c10k, que. Reemplazo me recomendarías ?

    ReplyDelete
    Replies
    1. Effects LayoutsOctober 25, 2017 at 11:11 AM

      Você pode tentar um B10k, mas a varredura do controle não será ideal

      Delete
  31. RogerNovember 1, 2017 at 4:01 AM

    Hi,

    How could I reduce gain in this pedal? I want an OD/Dist. Is it possible to achieve by changing the gain pot?

    Thanks!

    Roger

    ReplyDelete
    Replies
    1. Effects LayoutsNovember 1, 2017 at 9:23 AM

      You can try lowering the value of the gain pot, and also try lowering the value of the 1M resistor on the left side of the board.

      Delete
    2. RogerNovember 1, 2017 at 11:57 AM

      Thanks!

      Delete
  32. UnknownNovember 2, 2017 at 8:05 PM

    Hoy termine este pedal , suena bien. Solo que al.subir al máximo la ganancia hace un ruido horrible , alguna solución ? El potenciómetro que uso es un b100k, todo lo demás respete los componentes tal.cual el layout

    ReplyDelete
  33. UnknownNovember 3, 2017 at 10:42 PM

    Holaaaa el PCB listo para imprimir de este proyecto no lo encuentro......podrían agregarlo ?

    ReplyDelete
  34. PabloMarch 21, 2018 at 2:35 PM

    Hi! Im doing this one, and I have some problems... First, I couldnt to find a c10k for the tone, so I use a a10k and invert the wired. When I turn down the tone, down the volume... The other components is like the schematic, and when I put the gain al 3 o clock down the volume too... My english is so bad, sorry. You are the boss men

    ReplyDelete
  35. PabloMarch 22, 2018 at 1:37 PM

    Help me please

    ReplyDelete
  36. UnknownMay 3, 2018 at 5:34 AM

    Hi what about putting another 22 n cap in parallel with the one from presence pin 1 to ground?

    ReplyDelete
  37. UnknownMay 12, 2018 at 2:36 AM

    can i use a1m for gain and b500k for volume? also a a100k to presence?

    ReplyDelete
  38. UnknownAugust 1, 2018 at 12:12 AM

    Do you have the schematic?

    ReplyDelete
    Replies
    1. Effects LayoutsAugust 1, 2018 at 9:47 AM

      http://4.bp.blogspot.com/-R3P4vHbfLto/TyKL0JrsjTI/AAAAAAAAAvk/COfQ_E48yzk/s1600/MI_audio_dist.jpg

      Delete
  39. Jan arloSeptember 30, 2019 at 8:40 PM

    Can i run 18v with this layout?

    ReplyDelete
    Replies
    1. Effects LayoutsOctober 1, 2019 at 9:50 AM

      Yes. Just make sure your components (mainly the electrolytic caps) are rated higher than your supply voltage.

      Delete
  40. Jan arloNovember 24, 2019 at 8:36 PM

    Hi how can i add more bass? What components should i change or add

    ReplyDelete
  41. Ezequiel PinedoMay 21, 2020 at 7:18 AM

    Hello guys! This is an amazing project. I bought a clon based on this schematic and I'm having issues. Anyone can share the wiring to this pcb please?

    ReplyDelete
  42. UnknownApril 17, 2021 at 4:24 AM

    Why is the IC 072 very hot?

    ReplyDelete
  43. UnknownJuly 26, 2021 at 7:19 AM

    i succeed it sounds very good

    ReplyDelete
  44. GermanioOctober 27, 2021 at 5:17 AM

    Hice esta joya pero no me gusto con led así que los cambie por unos 1n4148 suena crunch pero al ponerlo en la cajita de lata se oye un pitido ...que debo hacer ? Será bueno apantallar el circuito?

    ReplyDelete
  45. MaisiJanuary 6, 2022 at 1:14 PM

    Is right the lugs of tone pot? That question because in the Angry Charlie PCB are different

    ReplyDelete

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