Monday, 26 October 2020

Jen KPS-900 Phase Shifter

Similar to MXR 45 phaser but the pesky J FETs is replaced by a CD4007 chip so no transistor matching is required.

 Schematic avaiable HERE


 



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27 comments:

  1. marios rappas27 October 2020 at 09:58

    Hello fuzzhead .. for weeks now I’m trying to finish the problem from my build of phase 90 ( sabrotone ) .. I’m so tired ,, I see today your schematic and I try it because I need a phase!!!!!!!!

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    Replies
    1. Alltrax7428 October 2020 at 10:40

      You'd better go for the Faze Filter if you want something close to the phase 90. Phase 45 is a more subtle effect (only 2 phase stages intead of 4)

      Delete
    2. Alltrax7428 October 2020 at 10:42

      Or the Grand Orbiter which sounds great (layout is verified)

      Delete
    3. marios rappas29 October 2020 at 12:02

      Ohhh thank you ,,, today I finish the kps-900 ,,, I send if is verified :D

      Delete
    4. marios rappas29 October 2020 at 12:32

      The faze filter is unverified ... but I try that for similar to phase 90

      Delete
  2. marios rappas27 October 2020 at 10:17

    The links are 12 not 11on the layout . King regards

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  3. KG27 October 2020 at 14:01

    Nice, thank you : i'm a phaser nerd!

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    Replies
    1. marios rappas27 October 2020 at 14:51

      Hello KG .. do you make the phase 90 from sabrotone layout ? Maybe ?

      Delete
    2. KG27 October 2020 at 15:11

      What do you mean : if i have already built it, or if i plan to do it? I didn't built the specific layout you mention, and I don't plan to do so either :)

      Delete
    3. marios rappas27 October 2020 at 15:22

      because you say that you are phaser nerd .. I have some problems with this layout ( sabrotone) and I wondered if you had made it.

      Delete
  4. KG27 October 2020 at 14:04

    (By the way, it seems that your picture is slightly cropped at the bottom. Everything is still readable, unless you have some things written below?)

    ReplyDelete
  5. marios rappas30 October 2020 at 01:17

    Soooo guys just finish the test of this board.. it”s work ... but I have some things to tell .
    1st- the speed knob work on 0 and little 2-3 position , after that position I can’t hear the effect .maybe need another value of pot
    2nd - the intensity knob work on 10(full) potition and little back .. maybe need and this another value
    3rd - the 3 pin of speed and the 1 pin of intensity still unsolder? Can I solder on ground ?

    That’s it ,, it’s work ...

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    Replies
    1. fuzzhead30 October 2020 at 04:43

      Thanks for giving it a go!
      According to the schematic, lug 3 of Speed and lug 1 of Intensity has no connection. Connecting these to ground would proboably mess things up. You could try to add a small jumper between lug 2 and 3 for Speed and 1 and for Intensisty....could make a difference but I doubt it.

      Curious which op amp you use? Part number can affect the the behaviour of the LFO. I'll tripple check the LFO section which is located at 5,6 and 7 at IC1.

      Also dues the trimmer affect the sound at all?

      Delete
    2. marios rappas30 October 2020 at 08:42

      . Oh yes for the insonlwr pins I see now from schematic . I use LM324 ... I try the smaller link between speed and intensity ..for speed pot I use linear and not antilog. Does make much difference ?

      Delete
    3. marios rappas30 October 2020 at 09:06

      I connect the pugs but I don’t see any difference ,,, I turn the trimmer now from the other side and work better :) ... and the speed knob is upside down ,, the slowest ion the 10 and the fast is in the 0.

      Delete
    4. fuzzhead30 October 2020 at 11:10

      After reading the thread at FSB it appears that a 10uF cap works much better than a 4,7uF cap. The LFO should be much slower with a higher value. Worth trying out?
      Will swap the connections for the Speed control....

      Delete
    5. marios rappas30 October 2020 at 15:10

      mmmm i try to change the 4.7 to 10 uf cap...the full speed its reduced little. sound is better..i start to love it a much

      Delete
    6. marios rappas30 October 2020 at 15:11

      somthin last .. the r3 i put 15 kohm ..if i put more like 20 kohm or 22 kohm.. what happen?

      Delete
    7. fuzzhead30 October 2020 at 15:50

      I think it will affect overall output volume...if you increase it there will be slifgtly less output.

      Delete
    8. marios rappas1 November 2020 at 11:39

      I try to put a 47k trimmer instead r3. .

      Delete
    9. KG21 December 2020 at 12:30

      "Will swap the connections for the Speed control...."
      Hi,
      has the layout been updated yet, or should we swap the connections?

      Delete
  6. marios rappas30 October 2020 at 12:32

    This comment has been removed by the author.

    ReplyDelete
  7. KG21 December 2020 at 12:27

    Hi,
    I am counting 25 cuts (not 24).

    ReplyDelete
    Replies
    1. fuzzhead21 December 2020 at 20:03

      I count 25 cuts too!
      Updated and yes, I swapped the connections.

      Delete
  8. Orion Tonehunt28 October 2022 at 00:08

    Instead of the zener, could I sub a 78l05 4.5v instead?

    ReplyDelete
  9. Orion Tonehunt29 June 2023 at 05:25

    Only getting a clean signal with the *faintest* phase. I used a 4007UBE, so not sure if it needs the buffered version. Will tinker abs report back.

    ReplyDelete
  10. Stef28 November 2024 at 08:54

    I used a TL084 and it works perfectly, a mix of phaser and univibe sound. I noticed that using 4007UBE or BE doesn't change so much, instead the amplifier can cause problem of distorsion

    ReplyDelete

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