Remote Wah Turret Board

Posted: 2012/03/13 in DIY Guitar Effect Pedal Projects, Remote/Rack Wah

Here’s a closeup of the auxiliary/breakout board for the remote wah.  The circuit is simple enough that a PCB isn’t really needed.  This is one is wired using an old-fashioned turret board:

  1. J.A. says:

    The 4 cables where are connected?

    • trabantland says:

      Black Wire = Ground
      White = Output Jack of Wah (Tip)
      Violet = Expression Pedal Sweep
      Blue = Capacitor at the base of Q2

  2. J.A. says:

    expression pedal sweep? waht is that? I have3 cables i use a fv-300L Input output to wah

    • trabantland says:

      The wiper on the expression pedal pot. It seems to me that your version of a rack wah sends the audio signal out to the pedal and back. That’s not a very good way to do it, as it will be susceptible to noise, and really defeats the purpose of mounting it in a rack unit. Using an optocoupler isolates the expression pedal from the audio circuit. No audio goes through the pedal. After all, the whole point of a rack/remote wah is to keep the audio signal path short, so that it stays inside the rack. Otherwise you might as well run cables out to a wah pedal and back.

      • J.A. says:

        No i each cabe i use for conect the pot of the pedal. i’ll make a picture…. in the Fv300L each cable connect each part of the pot of the pedal and i modified that for the same. i get two cables. one for in one for out and the ground. Later these cables i connect on the wah circuit. the same mode if i had the pedal inside the pedal.

  3. J.A. says:

    but can i do the same that yours?

  4. J.A. says:

    what would i have to do?

  5. J.A. says:

    what model of optocoupler is?

  6. Eddie says:

    Your project is very clear and perfectly excuted. But I wandering if the felling when you play with the remote version is the same than the original one? I heard some people complains about the “shorter sweep” action. What is your view?

    • trabantland says:

      I don’t find it an issue…in fact if you use an Expression Pedal like the Boss FV300, you have to move your foot a lot more compared to a Crybaby. It takes some getting used to at first, but I think it’s nice because you have more accurate control over the wah position and resulting tone.

  7. Peter says:

    This is a great project! Could you please indicate to me which connection on the optocoupler is the anode and cathode for the LED? Thanks for your help!

    • trabantland says:

      Hi Peter, I’m sure you’ve found this out by now but on just about any optocoupler there is usually a dot printed on the package. This indicates the LED cathode.

      • Peter says:

        Thanks for the reply 🙂 I’m just waiting for the parts to arrive to build this, so I’ll have a check when it arrives.
        I can’t see a dot on the one in the picture above; would it be on the top-right hand side of the component? Thanks again!

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