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.

Wednesday, July 15, 2015

ColorSound Wah-Wah

Here's the ColorSound Wah-Wah. I hadn't laid out a wah before, probably because I haven't built one myself before, and I don't use one much when I play. Anyway, the ColorSound Wah-Wah is pretty simple and sounds very good. What makes it unique is that it doesn't use an inductor like most wah circuits. This might be a good candidate to throw a buffer in front, but it's not necessary. There is a volume pot which you could omit if you want (in which case the Volume 3 pad becomes the output). You could also throw this in a 1590a if you wanted a non-treadle/fixed wah pedal. Or if you're really brave, you could mod a 1590a into a treadle pedal like Thomas Hafemann did.



21 comments:

  1. Effective and simple! thank you! I am about to end, the Overdriver colorsound, hot silicon, Galileo, morpheus distortion,

    I finally the shin ei, nice sound! :D

    ReplyDelete
    Replies
    1. It means "thanks bro!" I though that was the unique brazilian visiting your page, i'll try this pedal too.

      Delete
  2. Just found this site and have made my first 2 PCBs,many thanks for your efforts, however I have just built this wah as I once borrowed an original and really liked it and have a shell I bought in the 80s that is identical to the colorsound one including the operating lever and it isn't working. I am getting a self oscillation that changes in pitch as the pedal is rocked. I looked at a schematic on line and it doesn't seem to match your layout - can you tell me which schematic you used?
    Thanks

    ReplyDelete
  3. OK, I have spotted a couple of issues, firstly there should be a 33k resistor in series with the 15nF cap going to ground this is what causes the oscillation since the size of this resistor affects the resonance of the filter. I have put a 47k pot in there and as I turn it towards zero the oscillation starts.
    The other problem is a missing 100n cap which goes from the collector to the 6n8 cap and the 100n output cap - the existing caps need to be disconnected from the collector. Having made the changes the circuit works but I have also changed the input and output caps to 10n as shown elsewhere to brighten it up -may go lower still as it is a little dark. Have also removed the 47k to ground and not used the output pot as unity was not achievable without, may add a 150k as I seem to be getting some distortion now.
    Thanks,
    Dave

    ReplyDelete
    Replies
    1. Thanks for catching those mistakes. I must have been asleep when I laid this out. I've updated the layout with the changes. Once you get the distortion issue sorted out, if you still have a volume drop issue (which is pretty common with some of these older effects) you might want to put a booster after this circuit. The LPB-1 would be a good candidate. You could either include the volume pot after it, or use a 100k trimmer to set it to unity.

      Delete
    2. I have built it but the wah effect is low, it does not vary so much, what can I do? (I replaced the 2n5088 by bc549, because here is so difficult to find it)

      Delete
  4. I have built it but the wah effect is low, it does not vary so much, what can I do? (I replaced the 2n5088 by bc549, because here is so difficult to find it)

    ReplyDelete
    Replies
    1. Me too.. i also replace the 2n5088 by bc549 and got super low volume, and low wah effect, how can i fix this?

      Delete
    2. I had fixed it, now it works awesome. I change the bc549 with a 2n3904 transistor and now it work like a great wah pedal
      Thankyou for the layout...

      Delete
  5. Hi, in which orientation do I put a pot inside enclosure? Should the resistance increase or decrease as I "put my toes down?

    ReplyDelete
    Replies
    1. Resistance should increase as you put your toes down I believe.

      Delete
  6. Hallo, Ich habe es gebaut und es funktioniert Super, DANKE

    ReplyDelete
  7. Hello. Can anyone recommend some mods for bass use?
    Cheers.

    ReplyDelete
  8. i didnt know i will build it! So, because inductores very expensive in our sides, i built this. This wah realy working good when you will change resistor 33k from 3 wah pot to 470 ohm-2kom. I used 750 Ohm. Very good resaults!

    ReplyDelete
  9. This comment has been removed by the author.

    ReplyDelete
  10. This comment has been removed by the author.

    ReplyDelete
  11. what layout scheme is correct, the problem doesn't work

    ReplyDelete
  12. Any idea on how to build/wire this?
    1.wah when engaged
    2.volume pedal when disengaged

    ReplyDelete
    Replies
    1. Hello! You can use dual potentiometer for that.

      Delete
  13. This comment has been removed by the author.

    ReplyDelete