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.

Tuesday, August 11, 2015

Dunlop GCB-95 Cry Baby

Here's one of the most classic effects of all time, the Cry Baby wah-wah from Dunlop. The big red thing in the layout is the Fasel inductor, and there's room on the board for a pull down resistor at the input if you need it, I just didn't include it in the drawing. What else is there to say? Just build it!


12 comments:

  1. What is this comp labeled as 500mh? thx!

    ReplyDelete
  2. I hope you considering ibanez wh-10 as next wah pedal project bro.. :-)

    ReplyDelete
  3. hey man, q2 what transistor is? the image only says q1 - q3
    Thanks :D

    ReplyDelete
    Replies
    1. MPSA18s. They're listed just below the underside of the perf. Other high gain NPN silicons should work too (2N5089, BC550C, etc)

      Delete
  4. Your layout very very help me. Thanks and I have a question. Can I change pots of wah with LDR? What the LDR value?

    ReplyDelete
    Replies
    1. You could replace the pot with a LDR I guess. Value would need to be similar to the pot I would guess. You'll have to do some experimenting there.

      Delete
  5. And can I change inductor with another parts? What part is it?

    ReplyDelete
    Replies
    1. You're pretty much stuck with an inductor here. Check out the Colorsound Wah that doesn't use an inductor. It's a lot simpler circuit.

      Delete
  6. Trying this project, I had all the components here, except for the 3x MPSA18 (that I tried to use 3x BC877 instead, cause i had them here), and still waiting for the Yellow Fasel and another 500mH inductor that i bought. Everything is almost set up, the PCB is done, all the componentes are soldered and I can hear some hissing when i move the 100K pot, so I think this will work. I'll post again when I change the 3x BC877 for 3x MPSA18 and solder the inductor. Things will probably be delivered here in 5/6 days! See ya soon! :D

    ReplyDelete
  7. Heeeeeey again! I did it and it is working perfectly! :D
    I just had to do some modifications. That 8.2k resistor should be an 82k, and be careful about MPSA18 pins, cause in some manufactures (like the ones i bought haha) Pins 1/2/3 aren't exactly EBC, mine were ECB. And i didn't use the input buffer, for doing the True Bypass mod, i just removed the first transistor (Q1), the 2.2M, 1.8M and 10k(at input buffer) resistors, the 22pF capacitor and the 10nF capacitor (at input buffer). My new input was on "E" leg from Q1, and i used an Yellow Fasel (640mH) as my Inductor.
    Anyway, the only thing i saw as a mistake was the 8.2k resistor that should be an 82k, excpect for that the mods was on my own, not cause it was needed.
    Thank you very much for this layout, i really like the way you made the connection of the 470k resistor to the left side of the inductor without using any jumpers!

    ReplyDelete