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PROJECT NAME
CYGNUS
BASED ON
Cornish P-2 / G-2
EFFECT TYPE
Distortion / sustainer, fuzz
PROJECT SUMMARY
Based on the classic Big Muff circuit, this pedal adds a meticulously-designed buffered bypass along with
an additional transistor-based buffer stage on the effect input.
Actual size is 2.3" x 2.43" (main board) and 2.3" x 0.87" (bypass board).
CYGNUS DISTORTION/SUSTAINER
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
2.0.0 (2023-10-06)
1
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Summary of Contents for aion CYGNUS
- Page 1 Based on the classic Big Muff circuit, this pedal adds a meticulously-designed buffered bypass along with an additional transistor-based buffer stage on the effect input. Actual size is 2.3” x 2.43” (main board) and 2.3” x 0.87” (bypass board). CYGNUS DISTORTION/SUSTAINER...
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Page 2: Table Of Contents
Aion FX in 2023. The Cygnus is a faithful reproduction of the G-2 and P-2 circuits, and the parts list includes both variants. The default is the P-2 circuit, while each G-2 change is listed in the “Notes” column. -
Page 3: Parts List
Metal film resistor, 1/4W G-2 uses 680R. Metal film resistor, 1/4W 100k Metal film resistor, 1/4W 470k Metal film resistor, 1/4W Metal film resistor, 1/4W 100R Metal film resistor, 1/4W 100k Metal film resistor, 1/4W 390k Metal film resistor, 1/4W CYGNUS DISTORTION/SUSTAINER... - Page 4 Power supply filter capacitor. 220uF Electrolytic capacitor, 6.3mm Power supply filter capacitor. 100uF Electrolytic capacitor, 6.3mm Power supply filter capacitor. 220uF Electrolytic capacitor, 6.3mm Power supply filter capacitor. Film capacitor, 7.2 x 2.5mm P-2 only. Omit (leave empty) for G-2. CYGNUS DISTORTION/SUSTAINER...
- Page 5 Switchcraft 111X or equivalent. 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent. 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. CYGNUS DISTORTION/SUSTAINER...
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Page 6: Build Notes
G-2 unit, but once again, each of the seven that we’ve traced has used 10k here. Since the buffer is a separate PCB module shared between all of the pedals, we’re confident that the current-production G-2 uses 10k as well. CYGNUS DISTORTION/SUSTAINER... - Page 7 180 degrees. Use a multimeter to check the pinout if you’re not sure. The transistor outlines also include a rectangular collector pad above the “B” and “E” pins so that a SMD transistor such as the BC849C can be used. CYGNUS DISTORTION/SUSTAINER...
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Page 8: Schematic (P-2)
220uF 100uF 220uF SW1B SW1D TO OUTPUT JACK PCB IN BC550C BUFFER OUT BC550C 470pF 470k FX GND BC550C 1N914 1N914 1N914 1N914 220n 220n 220n 470pF 470pF EFFECT OUT BC550C 470k 470k 25kB TONE OMIT BC550C BC550C CYGNUS DISTORTION/SUSTAINER... -
Page 9: Schematic (G-2)
120R FROM EFFECT OUT FX GND 220uF 100uF 220uF SW1B SW1D TO OUTPUT JACK PCB IN BC549C BUFFER OUT BC549C 470k FX GND BC549C 220n 220n 220n EFFECT OUT BC549C 470k 470k 25kB TONE 22uF OMIT BC549C BC549C CYGNUS DISTORTION/SUSTAINER... -
Page 10: Drill Template
125B INCH 0.625” 0.625” ø3/8” ø3/8” ø1/2” VOLUME SUSTAIN x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” TONE x: 0, y: +0.66 ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.775 x: 0, y: -1.775 ø5/16” ø15/32” CYGNUS DISTORTION/SUSTAINER... -
Page 11: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B CYGNUS DISTORTION/SUSTAINER... -
Page 12: Wiring Diagram
WIRING DIAGRAM F.GND GND BUF FX +V JACK GND JACK GND BUF 125B CYGNUS DISTORTION/SUSTAINER... -
Page 13: Document Revisions
• Changed R7 from 20k to 10k and added information on this change to the build notes section. 1.0.2 (2023-08-04) Changed R39 from 50k to 51k and added information on this change to the build notes section. 1.0.1 (2020-04-06) Added notes about resistors in first transistor stage (R18 and R19). 1.0.0 (2019-03-14) Initial release. CYGNUS DISTORTION/SUSTAINER...
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