Dr Q Autowah

Dr Q is a classic autowah DIY project. This envelope filter effect is highly interactive with the dynamics of the input signal, creating a distinctive choppy rhythm guitar similar to the funk recordings from the 1970s.
Steps
  1. Overview
  2. Designators and components
  3. General description of components
  4. PCB assembly
  5. Enclosure and wiring
  6. Enclosure drilling
Categories
Tayda Electronics Kits, DIY Projects, DIY Guitar Effects
Created by DHEA
Status: Active
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Designators and components Step 2 of 6

COMPONENT LIST

PCB
Link  https://www.taydaelectronics.com/dr-q-autowah-diy-pcb-guitar-effect.html

Resistors
R1     1M        1M OHM 1/4W 1% METAL FILM RESISTOR
R2     1M        1M OHM 1/4W 1% METAL FILM RESISTOR
R3     10k       10K OHM 1/4W 1% METAL FILM RESISTOR
R4     47k       47K OHM 1/4W 1% METAL FILM RESISTOR
R5     2.2M     2.2M OHM 1/4W 1% METAL FILM RESISTOR
R6     10k       10K OHM 1/4W 1% METAL FILM RESISTOR
R7     47         47 OHM 1/4W 1% METAL FILM RESISTOR
R8     100       100 OHM 1/4W 1% METAL FILM RESISTOR
R9      22k      22K OHM 1/4W 1% METAL FILM RESISTOR
R10    47k       47K OHM 1/4W 1% METAL FILM RESISTOR
R11    47k       47K OHM 1/4W 1% METAL FILM RESISTOR
R12    470k     470K OHM 1/4W 1% METAL FILM RESISTOR
R13    470k     470K OHM 1/4W 1% METAL FILM RESISTOR
R14    470k     470K OHM 1/4W 1% METAL FILM RESISTOR
R15    47k       47K OHM 1/4W 1% METAL FILM RESISTOR
R16    47k       47K OHM 1/4W 1% METAL FILM RESISTOR

Capacitors
C1    47n       47NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C2    47n       47NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C3    10u       10UF 50V ELECTROLYTIC CAPACITOR 5X11MM
C4    4.7n      4.7NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C5    4.7n      4.7NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C6    1n         1NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR 
C7    10u       10UF 50V ELECTROLYTIC CAPACITOR 5X11MM
C8    47n       47NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C9    10n       10NF 100V 5% POLYESTER FILM BOX TYPE CAPACITOR
C10  10u       10UF 50V ELECTROLYTIC CAPACITOR 5X11MM

Transistors
Q1    2N5457     SMD SOT-23 2N5457 JFET N-CHANNEL TRANSISTOR
(Q1  PCB     SMD TRANSISTOR PCB)
Q2    2N3904     2N3904 NPN GENERAL PURPOSE TRANSISTOR

OPAMP
U1    TL072       TL072 OPERATIONAL AMPLIFIER
(U1 Socket    8 PIN DIP IC SOCKET ADAPTOR)

Diodes
D1    LED            LED 3MM RED  
D2    LED            LED 3MM RED   
D3    1N914        1N914 SMALL SIGNAL DIODE 200MA 100V

Potentiometers
SENS           100K-B                  100K OHM LINEAR POTENTIOMETer ANGLED
RANGE         20k/25k-B Trim      20K OHM TRIMMER POTENTIOMETER CERMET 1 TURN 3362P

SWITCH
SW    SWITCH    MINI TOGGLE SWITCH DPDT ON-ON


PCB

 

PCB SCHEMATIC

Circuit based on original Dr Q with the added modifications by Jack Oman.

 

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