Friday, 22 April 2016

THAT Jam Compressor

Here is a DIY project similar to the Carl Martin Compressor Limiter.
There are 2 layouts: a large one that works at 9V and a smaller one where you need to decide a way to feed +/- 12V to the circuit (just a charge pump with regulators wouldn't work with this circuit).
You should read the original threads from FSB here and here before building this effect.
Good luck!

Posted by at 18:29
Tags: , , , , ,

16 comments:

  1. Unknown23 April 2016 at 03:07

    Cooll! I guess this will be perfect for my Eurorack. It's hard to find good stripboards for my new enclosure and +/-12v supply. I worry the signals of my modular will be somewhat to hot for this though.

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  2. Bobbass4k25 April 2016 at 11:57

    330nF is missing a cut under it.

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  3. Alex25 April 2016 at 14:58

    Thanks Robert.
    It has been fixed.

    ReplyDelete
  4. Unknown30 April 2016 at 03:15

    is this the right chip? http://www.mouser.com/ProductDetail/THAT/4301P20-U/?qs=sGAEpiMZZMvxTCYhU%252bW9mSHGcoR5HnTi6ZnSaFFEg3U%3d

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    Replies
    1. Alex30 April 2016 at 11:33

      That should be the right one.
      Wow! It is expensive!

      Delete
    2. MichaelPolutta30 April 2016 at 16:04

      Small Bear has it for 9.75 each.

      Delete
  5. Mr.Baiser9 May 2016 at 20:48

    This is a great layout. But I'd recommend to buy the kit (or pcb) at uk-electronic.de.

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  6. Anonymous7 June 2016 at 00:51

    Verified!
    here's the pics:
    http://hpics.li/e2a4209
    http://hpics.li/f3842d9
    http://hpics.li/475668b

    Great comp, better than my Mad Prof Forest Green Comp!

    Family pic with the FGC:
    http://hpics.li/674601f

    No Noise, a great build! Will stay at home.

    Many Thanks for the layout Alex.

    Jack_Vester

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    Replies
    1. Alex7 June 2016 at 10:24

      Cool! Thanks Jack!
      Looks cool!

      Delete
    2. MAO8 July 2016 at 14:30

      How do you properly adjust the precision trimmers?

      I read the info here http://www.musiker-board.de/threads/workshop-that-jam-kompressor-f%C3%BCr-bass-und-gitarre-platinen-version-1-4.388884/#post4699621 it mentions setting one at 50 ohms and the other at 20 ohms, but I'm not sure what that achieves.

      There must be a reason the design uses trimmers instead of fixed resistors there, but why?

      Delete
    3. Anonymous21 July 2016 at 08:33

      I just set the trimmers to have exactly +12,0V and -12,0V

      Delete
    4. Unknown6 November 2016 at 15:41

      how bout the 50k trimmer?

      Delete
  7. Unknown6 November 2016 at 15:30

    This comment has been removed by the author.

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    Replies
    1. Unknown6 November 2016 at 15:39

      thanks for the tip man! That was very helpful!

      Delete
  8. Unknown6 November 2016 at 15:40

    Hi Guys! Currently working on this pedal too! How do you guys set the 50k trimmer? is it at 12v too? Thanks!

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  9. Piotr Kuzemczak22 April 2017 at 13:40

    Maybe a stupid question, but...
    What is TR2 and TR3? And where the hell is TR1 then?

    ReplyDelete

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