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PROJECT NAME
CIRRUS
BASED ON
Ibanez
®
ST-9 Super Tube Screamer
EFFECT TYPE
Overdrive
PROJECT SUMMARY
An updated version of the Tube Screamer featuring a frequency-adjustable midrange boost that can be
placed either before or after the drive stage.
Actual size is 2.3" x 1.86" (main board) and 1.78" x 0.86" (bypass board).
CIRRUS DYNAMIC OVERDRIVE
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.0 (2021-03-19)
1
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Table of Contents
Related Manuals for aion Cirrus
Summary of Contents for aion Cirrus
- Page 1 An updated version of the Tube Screamer featuring a frequency-adjustable midrange boost that can be placed either before or after the drive stage. Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.86” (bypass board). CIRRUS DYNAMIC OVERDRIVE...
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Page 2: Table Of Contents
Cirrus, which uses on-board jumpers to set the mid-boost location but can’t be toggled.) In addition to the mid-boost slide switch, the Cirrus also includes a clipping diode switch so you can select between three different sets of diodes. -
Page 3: Parts List
27n if using 20kC midrange pot. See build notes. Film capacitor, 7.2 x 2.5mm 68n if using 20kC midrange pot. See build notes. Film capacitor, 7.2 x 3.5mm 47pF MLCC capacitor, NP0/C0G Film capacitor, 7.2 x 2.5mm 100n Film capacitor, 7.2 x 2.5mm CIRRUS DYNAMIC OVERDRIVE... - Page 4 DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. BATT Battery snap 9V battery snap Optional. Use the soft plastic type—the hard-shell type will not fit. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. CIRRUS DYNAMIC OVERDRIVE...
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Page 5: Build Notes
If you want more than stock but not that much more, use the values from the Pearl OD-05, which at +15 dB is right in the middle: • C3: 4n7 • C4: 68n Note that these are changes from the 100kC adjusted values, not the stock 20kC values. Scale accordingly if using a 20kC boost pot. CIRRUS DYNAMIC OVERDRIVE... -
Page 6: Schematic
SCHEMATIC 100R 1N5817 100uF 100n 47uF IC1B IC1A SW1B SW1C IC2A IC2B SW1D TONE 100n 20kW 2N5088 470R 220n D2-3 1N914 CLIP D4-7 1N914 D8-9 DRIVE 500kA CIRRUS DYNAMIC OVERDRIVE... -
Page 7: Drill Template
0.65, y: +1.71 ø9/32” ø9/32” CLIP x: 0, y: +1.06 LEVEL DRIVE ø1/4” x: -0.65, y: +0.41 x: 0.65, y: +0.41 ø9/32” ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” CIRRUS DYNAMIC OVERDRIVE... -
Page 8: Enclosure Layout
Solder it like you would if they were normal pads, but bend the small set of pins forward slightly so they make contact with the edge of the pads. The solder will flow easily into the half-holes. 125B CIRRUS DYNAMIC OVERDRIVE... -
Page 9: Wiring Diagram
GND +V +V JACK GND JACK GND GND PCB 125B Shown with optional 9V battery. If battery is omitted, both jacks can be mono rather than one being stereo. Leave the far-right lug of the DC jack unconnected. CIRRUS DYNAMIC OVERDRIVE... -
Page 10: Document Revisions
(In other words: you don’t have to go out of your way to advertise the fact that you use these PCBs, but please don’t go out of your way to hide it. The guitar effects industry needs more transparency, not less!) DOCUMENT REVISIONS 1.0.0 (2021-03-19) Initial release. CIRRUS DYNAMIC OVERDRIVE...
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