Akashic Guitar effects circuit lookup
WAHSWEEPGAINVOICE

Enclosure not stated · 4 knobs

Tagboard Effects

Dunlop Dunlop GBC-95 Modded CrybabyVerified

Based on the Dunlop GCB-95 Cry Baby· 6 other boards clone it

Controls
Wah · Sweep · Gain · Voice
Build
Vero· 21×12· 12 cuts, 6 links
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Dunlop, Wah

From the post

For those that are just never satisfied by whats out there in the land of wahs I took the standard Dunlop GBC-95 Crybaby and added some features based on common mod points. So how's this supposed to work?

Voice Pot: Changes the voice of the the wah by changing the sharpness and making it more "vocal." The larger the value the more "vocal" the wah sounds.

Gain Pot: Really this controls the overall bass and gain of the wah. The lower the value the more growl and bass you'll get.

Sweep Switch (SW): This controls the sweep range of the wah. The larger the cap the more bass sweep you'll get. For instance the common value is 10nF, which i put on the board already, and the bass wah has a 68nF. Personally if I were making this I would start with the stock value and increase using values I liked up to the bass value, but hey, that's just me.

Sweep Pot: This will control the range of the week of the wah pot. No different then what you find on the Dimeback or Cantrell Wah.

R1: This will set the volume of the wah, the smaller the value the more volume you'll get. Typically it's 68k. So you can mess around with it and get as much or as little volume as you liked.

Schematic

This is a board layout, a drawing of where each part goes, and the post may link the schematic it was drawn from. Open the layout at Tagboard Effects. No KiCad fragment has been drawn for this circuit yet.

Parts list 29 rows

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Check before you build · 2 values the reader of this layout was not sure of
  • R1 (main board, between Q1 and Q2): only the designator is printed, no value
  • C2, C3, C4, C5, C6 on the sweep board: only designators are printed, no values
RefValueNormalizedTypeNotes
Resistors 9
×21k1kread from the layout by eye
×11.5k1.5kread from the layout by eye
×210k10kread from the layout by eye
×122k22kread from the layout by eye
×182k82kread from the layout by eye
×2470k470kread from the layout by eye
×11.8M1.8Mread from the layout by eye
×12.2M2.2Mread from the layout by eye
R1??value not printed; read from the layout by eye
Capacitors 11
×122pF22pread from the layout by eye
×310nF10ntwo on the main board, one on the sweep board; read from the layout by eye
×1100nF100nread from the layout by eye
×2220nF220nread from the layout by eye
×14.7uF4.7uelectrolytic; read from the layout by eye
×1100uF100uelectrolytic; read from the layout by eye
C2??sweep board, value not printed; read from the layout by eye
C3??sweep board, value not printed; read from the layout by eye
C4??sweep board, value not printed; read from the layout by eye
C5??sweep board, value not printed; read from the layout by eye
C6??sweep board, value not printed; read from the layout by eye
Transistors 3
Q1MPSA13MPSA13read from the layout by eye
Q2MPSA18MPSA18read from the layout by eye
Q3MPSA18MPSA18read from the layout by eye
Inductors 1
×1??labelled 'Inductor', value not printed; read from the layout by eye
Potentiometers 4
Wah100K100kPotentiometertaper not stated; read from the layout by eye
SweepB5KB5kPotentiometerread from the layout by eye
GainB1KB1kPotentiometerread from the layout by eye
VoiceB100KB100kPotentiometerread from the layout by eye
Switches 1
SW2P6T2P6Trotary, 2 pole 6 position; read from the layout by eye

Other boards based on the Dunlop GCB-95 Cry Baby