Wah Baby

Based on a classic wah pedal design (Hint: You’re old enough to know better) the Wah Baby is fitted for Eurorack and includes CV control over the effect, with input for CV from an external source, or use the built-in LFO. Pair this with the Wocka for some classic psychedelia. Whoa, man…

Note: The schematic below represents the full vision for this module. The version in the image to the left was pared down for lack of a SP3T switch. The module in the image doesn’t include the sine and square outputs from the LFO. The triangle output connects directly to pin 3 of SW2.


As with any schematic found on the internet, exercise caution when building. Test the build before plugging it into your case. If you find mistakes in the schematic, or you have recommendations for improving the design, feel free to contact us and let us know.


  • Resistors
    • 300R (1) R7
    • 2.2k (1) R8
    • 10k (5) R1, R4, R12, R14, R19
    • 22k (2) R11, R20
    • 27k (2) R2, R15
    • 68k (1) R3
    • 82k (1) R17
    • 100k (5) R5, R6, R9, R16, R18
    • 470k (2) R10, R13
  • Capacitors
    • 0.001uf (3) C1, C6, C8
    • 0.01uf (2) C2, C4
    • 0.1uf (2) C5, C7
    • 4.7uf (1) C3
  • Potentiometers
    • 100k (1) Wah frequency RV2
    • 1M (1) LFO frequency RV1
  • Transistors
    • MPSA18 (1) Q1
    • MPSA42 (1) Q2
  • Inductor
  • ICs
    • TL074 (1) U1
  • Audio jacks (2) J1, J3
  • Switched audio jacks (1) J2
  • SPST switch (1) SW2
  • SP3T switch (1) SW1


Coming at some point in the future.