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Thursday, 19 June 2014

Ibanez SD9M Sonic Distortion Mod

There are two dual opamps, and one half of the other is completely unused in the original. So i used the remaining half as a buffer for the reference voltage. D1 and D2 are your clipping diodes. Should be easy enough to add a third switch to act as a diode clipping switch.




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34 comments:

  1. Travis20 June 2014 at 02:00

    What is the advantage of buffering vref? Sorry for bein a noob!

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    1. mirosol20 June 2014 at 08:56

      More stable reference voltage. And this configuration is rather pro :)

      I have no idea why they'd use two dual opamps in the original either, as the one half is a signal buffer. One transistor would have been enough to replace the need for another opamp. But. I guess it's one of those things where folks will be selling these used at ebay with a "It has TWO JRC4558 chips in it" -line.

      Nice read on the unused opamp halves: http://encon.fke.utm.my/nikd/latest/sloa067.pdf#page=8
      +m

      Delete
    2. Travis20 June 2014 at 20:07

      Thanks Miro

      The clips of this actually sound pretty badass. I like the mids switch

      Delete
    3. mirosol20 June 2014 at 20:37

      No problem mate. I think i want to build one for myself once i got back to my desk. With on-off-off clipping switch :)
      +m

      Delete
  2. NIAB25 June 2014 at 05:27

    Hello Miro, even without the clipping switch would you consider this project verified? should it work?

    Thanks.

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    1. mirosol25 June 2014 at 07:07

      I haven't built one yet, and as far as i know, no one else hasn't either. So no. I wouldn't call it verified at the moment. Sure, it should work :)
      +m

      Delete
    2. NIAB25 June 2014 at 14:04

      Thanks for the answer Miro, we dont have vero boards in our country so i have to draw everything (photoshop) then do the PCB Etching following your projects. Im interesting in this one with the gain and mid switch :)

      Cheers

      Delete
  3. NIAB28 June 2014 at 00:21

    Is this buffered bypass?

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    1. IvIark28 June 2014 at 00:39

      The bypass method is separate in 99% of the layouts on this site (basically all layouts unless it's mentioned otherwise) and so you can choose whatever method you prefer, true bypass, buffered or any other method you want. We suggest the true bypass method shown in the Offboard page, but some people prefer buffers and they can do that no problem if they want to.

      The circuit itself does have an input buffer so the signal hits the buffer first before going to the amplifying stages.

      Delete
  4. NIAB30 June 2014 at 05:44

    thanks for your clear and helpful planation Mark, i'll go for the true bypass them.

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  5. Unknown1 July 2014 at 18:12

    mirosol iviark hello and help me, I just got B20k pot tone ,any idea to put resistor
    order to be 25k, thanks, sorry my bad english

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    Replies
    1. IvIark1 July 2014 at 18:58

      20K is fine

      Delete
    2. Unknown3 July 2014 at 20:00

      finaly work fine,. thank for this layout
      :)

      Delete
    3. mirosol3 July 2014 at 23:40

      Great to hear it Agung! Cheers!
      +m

      Delete
    4. Unknown11 July 2014 at 16:16

      Hay miro all layout in guitar fx layout very cool,but Why is there no layout sanamp GT2?

      Delete
    5. mirosol11 July 2014 at 17:14

      Because the circuit is huge :)
      +m

      Delete
    6. Unknown11 July 2014 at 19:23

      Yes I know it is huge .. As flanger

      i prefer veroboard, Because vero makes me think. Btw Hey .. I'm waiting for the latest layouts. :-P

      Delete
  6. Unknown17 May 2015 at 23:33

    Hi,
    when the volume is full its like the same nivel the clean sound !
    any idEa about change something for have more volume ?
    FRANCK
    BEST REGARDS

    ReplyDelete
  7. ernesto1 November 2015 at 21:35

    I have made this pedal (is my first one) and it sounds good i like the way it sounds but wen the gains switch is one it has a lot of hum everything in the connection is ok and i have seen every ground point and stills ok the only thing i have to say is that i have proved it with a 12v power supply
    Hope you can help me with that
    Best Regards!!!!

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    Replies
    1. Jupnitski7721 April 2016 at 08:07

      What I've learned over dozens of pedals; check and double-check. And after that, check again :)
      Firstly I'd check the board for solder bridges and bad cuts (believe me, those are the corner stones of many malfuntioning builds) :)
      Then check that the switch works like it should (with a multimeter, ofcourse).
      I can't say how the 12V supply would affect this one, but to rule that out, try using 9V.
      Also, check the Distortion -potentiometer. I had a "budget model" Distortion -potentiometer on my build and the signal barely came through. After I changed it, the pedal came to life. And I must say, this pedal rocks!

      Delete
  8. Unknown11 February 2016 at 17:02

    I just built this and one half of IC 1 has 8volts on pin one and 1.5vopts on pin two. I know they are supposed to be relatively similar. Any ideas what might be wrong? Thanks!

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    1. Jupnitski7721 April 2016 at 07:40

      Make sure you have made a clean cut on the board under the IC1 (between pins 1 and 8). That kind of voltages should only be present in the +V -line = both leads of D5 and 100R resistor and pin 8 of both IC's.

      Delete
    2. Jupnitski7721 April 2016 at 07:46

      Oooops! Forget about my D5 and 100R nonsense! I had a different layout opened on my screen :D
      But check that cut under IC1, between pin 1 and 8.

      Delete
  9. Unknown29 May 2016 at 10:31

    Hi Mirosol, I think there is a small mistake in your layout. According to the schematic at http://aionelectronics.com/wp-content/uploads/2014/06/sd9m-schematic.png, the resistor to the right of the layout, the one connecting to the 470nF cap to the diodes, should be a 2K2, just like the one after, in the signal chain. It is the one tagged as R10 in the schematic, I guess this is why it has ended as a 10K in your layout... ;)
    I have fixed it in my build, and it is working like a charm. :)
    I will now be playing with the clipping diodes... ^^
    Thanks for that layout, I think this pedal sounds awesome! :)
    Cheers

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  10. marioalejandrofuentes11 November 2019 at 08:00

    Hello Mirosol, I need to change the D3 Diode but I cant find what is exactly the model I believe is a W03C/1N4001? is that right? please let me know and thanks in advance!

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  11. Elijah-Baley12 November 2019 at 10:36

    I'll try to answer. D3 (1N5817 in the layout) is a protection in case of invertion of the polarity, it even cut of a bit the voltage and prevent eventually squeal noises. A 1N4001 will work fine, though it will drop a bit more voltage.

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    1. marioalejandrofuentes17 November 2019 at 21:48

      Oh my bad I didnt see that part of the layout! thank you very much.

      Delete
  12. mirosol13 November 2019 at 05:41

    marioalejandrofuentes:
    Yes. That is the polarity protection diode. Basically any Schottky barrier diode will do in its place. Or on the other hand, any diode except a zener. If you're repairing an original unit, you could get away with any 1N400X diode.

    Elijah-Baley:
    Exactly :)
    +m

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    1. marioalejandrofuentes17 November 2019 at 21:51

      Yes, I'm repairing an original unit that it was overpowered. Thank you very much!. On the other hand, any suggestions of mods for this pedal?

      Delete
  13. steph2 February 2020 at 20:07

    Hi
    I d like to replace the footswitch for 3pdt like switch. I already change the one on my ts9 but the original sd9m is totally different. I don t know anything about electronics but I can follow steps to do the job.
    Any suggestions
    Thank s

    ReplyDelete
  14. Unknown17 March 2021 at 17:08

    Hallo to all! I finished it today (after some days of working) and it's a true tool to play hard rock. Power chords, single note and great sustain! Really useful the two switch for best for best suitable contest. Really thank to you for this opportunity you gave to us togheter join opinions and experiences. Sorry for my language not so correct

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  15. Unknown17 March 2021 at 17:16

    I finished it today and I think it's a true tool for hard rock. Power chords, single note and great sustain with very high gain without to be muddy. Very useful the two switch to change tone in many situations. I'd like to thank you for this opportunity and support also in this community. Thanks a lot!

    ReplyDelete
  16. Unknown14 May 2021 at 23:25

    can anyone provide me a circuit diagram of this build?

    ReplyDelete