Saturday, 16 January 2016

Madbean Shortstack Overdrive

Noticed frank had posted this in response to someones questions about the bluesberry mod for the hotcake. When i compared the schematic to the hotcake i noticed a few differences so I thought it would be a nice addition and variation to have on the site. The only addition to the schematic I mad is I added the typical 1M pulldown resistor to prevent any switch popping.



Posted by at 02:15
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18 comments:

  1. Anonymous16 January 2016 at 16:42

    I believe you need to reverse the orientation of the diodes, otherwise D2 will always be conducting. See my follow up comments. Thanks!

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    1. Zach17 January 2016 at 01:51

      cool. just saw the post and fixed the diodes. i listed to the hotcake and its a nice OD, and some of the psych bands i really like and have seen live use it. i think some of the value changes in the madbeans version will make a significant difference in tone. so will be worth doing.

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  2. Unknown18 January 2016 at 08:39

    Just made this, works a treat! I used 240r resistors in place of the 220r. Unfortunately I don't the right reverse log pots, I used linear which has made those controls effectively useless but it still sounds sweet with the gain dimed. Cheers!

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    1. Zach18 January 2016 at 09:29

      awesome. how does it sound compared to the hotcake demos? i'm super curious since there are no demos for this, well at least any that i could find.

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  3. Unknown18 January 2016 at 09:59

    Well I don't think I can be much of an authority on this but from what I can tell it sounds very hot cakey. I need to wait until my next tayda order arrives before I can really judge I t in its full glory. Also for the record I used a TL071.

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  4. Hozy3123 January 2016 at 17:28

    Built this using a 741 and it sounds really good. I also had to use linear pots for the vol & gain but will rectify soon.

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  5. Jochen25 January 2016 at 12:37

    Hi there,
    is D2 already reversed or is the schematic OK now?
    I build it but its not working yet...
    Thanks a lot for the great work!
    Jochen

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    1. Zach25 January 2016 at 14:14

      hey jochen. the layout matches the schematic and is verified. if you built it and it didn't work there's got to be a build error somewhere. post the problem and some pictures of your build in the debugging section on the forum.

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  6. Anonymous25 January 2016 at 14:22

    For those wondering about D1 and D2. They are optional and you can build this effect without them. I would start by building without and testing, then add them in to see if they change the sound significantly. Also, if you leave them out, you can eliminate the upper blue jumper wire. And any vero with only ONE jumper is worth building ;)

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  7. Jochen25 January 2016 at 17:12

    This comment has been removed by the author.

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  8. Jochen25 January 2016 at 17:13

    It sounds like Hell -Yeah :)
    My mistake (bad Solderpoint).
    I´ll Post a Pic of the finished Pedal as soon as possible.

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    1. Zach26 January 2016 at 01:33

      no worries buddy. the important thing is it's working and you're happy with the build. just remember if you're ever having a problem where to post about it so someone can try and help you out.

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  9. Ongy Téllez10 October 2016 at 17:52

    Where does it goes the volume 1 lug? I just leave it without conection?

    Thanks in advance! :)

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    1. Zach10 October 2016 at 18:31

      Goes to ground. It should be in the notes, I'll fix it later.

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  10. Zach11 October 2016 at 15:33

    The 100uF is for power filtering. I'm not sure what oscillation you're talking about, there's not issues with this layout.

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  11. IvIark10 March 2017 at 19:00

    The pulldown resistor is used to reduce or eliminate (hopefully) the popping you get when you switch on and so are breaking that connection to ground. So yes you still require it, unless you get no popping of course, but you'll need to experiment with that yourself.

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  12. Unknown16 September 2019 at 17:14

    Is there a reason that the Volume is listed as 50KC above but according to the build document (https://drive.google.com/file/d/0B7EnzxavIi5_bks0cUo5bVhBUnc/view) should 50KA? And Volume 1 needs to go to ground or not?

    Also, what effect would changing the Gain pot to 10KB have?

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