Akashic Guitar effects circuit lookup
GAINTONEVOLUME

Enclosure not stated · 3 knobs

Tagboard Effects

Banzai ColdfusionVerified

Based on the Banzai Coldfusion

Category
Overdrive
Controls
Gain · Tone · Volume
Build
Vero· 19×26· 28 cuts, 13 links
Layout
Verified · Tagboard Effects marks it as built and working
Tags
Overdrive

From the post

Request. Hmmm, I'm spotting a few similarities to something else here! :o) But true bypass switching and so without the famous buffer. It does have a lot of changes though and some of them will undoubtedly make a difference and affect the final tone, so worth a build for you Klon fans. Note the two required ground connections, just daisy chain the connection or add a column and link if you prefer.

Info about the original:

The Cold Fusion Overdrive is a true overdrive that naturally melts with your guitar and amplifier rather than just changing your sound. The pedal has two distinct fields of application: If the Gain control is set at zero the Cold Fusion is providing more than 25dB of clean boost - more than enough to seriously overdrive the preamp tubes of your amplifier and get a natural cranked amp tone.

When you turn the Gain up past 9:00 you can gradually add more and more distortion. The Gain control is a dual pot that controls different parts of the circuit simultaneously, to produce a transparent, warm overdrive at any setting. The Gain knob and the Tone knob are useable throughout their whole range and are capable of producing many shades of overdrive. The spectrum extends from "touch of dirt" to "bluesy tube sound".

Unlike other overdrive pedals the Cold Fusion Overdrive doesn't have that nasty nasal, mid-rangey taste to it and it doesn't lose bottom end when cranked. An impressive crystal clear boost and fat, dirty overdrive sounds are the hallmarks of the pedal. The active tone control lets you cut or boost different parts of the frequency spectrum with no loss.A true bypass with LED indicator instead of a cheap input buffer and a 2,1mm barrel jack 9V connector are standard features with Banzai.

Revised layout based on the updated Klon layout. The choice is yours.

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 41 rows

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Check before you build · 6 values the reader of this layout was not sure of
  • 3K15 right of IC1 near the top right 10u: printed clearly, unusual value
  • 374K at the left edge above 540R: printed clearly, unusual value
  • 540R at the left edge by the 9V wire: printed clearly, unusual value
  • 430K at the top, right of the 220p: printed clearly, unusual value
  • 3n8 right of IC2: printed clearly, unusual value
  • D1 and D2: legend prints AA114, kept as printed, unusual part number
RefValueNormalizedTypeNotes
Resistors 21
×1120R120read from the layout by eye
×1270R270read from the layout by eye
×1540R540read from the layout by eye
×1560R560read from the layout by eye
×21K1kread from the layout by eye
×13K153.15kread from the layout by eye
×14K74.7kread from the layout by eye
×25K15.1kread from the layout by eye
×16K26.2kread from the layout by eye
×210K10kread from the layout by eye
×115K15kread from the layout by eye
×120K20kread from the layout by eye
×122K22kread from the layout by eye
×127K27kread from the layout by eye
×139K39kread from the layout by eye
×147K47kread from the layout by eye
×3100K100kread from the layout by eye
×1150K150kread from the layout by eye
×1374K374kread from the layout by eye
×1430K430kread from the layout by eye
×11M1Mread from the layout by eye
Capacitors 9
×210p10pread from the layout by eye
×1220p220pread from the layout by eye
×11n51.5nread from the layout by eye
×13n83.8nread from the layout by eye
×222n22nread from the layout by eye
×233n33nread from the layout by eye
×268n68nread from the layout by eye
×910u10uelectrolytic; read from the layout by eye
×147u47uelectrolytic; read from the layout by eye
Diodes 5
D1AA114AA114germanium; read from the layout by eye
D2AA114AA114germanium; read from the layout by eye
D31N47361N4736 / 6V8zener; read from the layout by eye
D41N58171N5817read from the layout by eye
D51N58171N5817read from the layout by eye
ICs 3
IC1TL072TL072read from the layout by eye
IC2TL072TL072read from the layout by eye
IC3ICL7660SCPAICL7660SCPAcharge pump; read from the layout by eye
Potentiometers 3
GainB100KB100kPotentiometerdual; read from the layout by eye
ToneB10KB10kPotentiometerread from the layout by eye
VolumeB10KB10kPotentiometerread from the layout by eye