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DISTORTIONTONEVOLUME

125B · 3 knobs

Aion FX

AntipodeVintage Fuzz

Based on the Roland AF-60 Bee Gee· 2 other boards clone it

Category
Fuzz
Controls
Distortion · Tone · Volume
Difficulty
Easy
Price
$12.50in stock

From the vendor

While the circuit is best known as the “Jet” stage from the Roland AP-7 Jet Phaser, the standalone pedal version is much more flexible with a wider tonal palette to play with.

The Antipode Vintage Fuzz is an adaptation of the Roland AF-60 Bee Gee, a fuzz/distortion from 1975 that is best known as the standalone version of the “jet mode” of the legendary AP-7 Jet Phaser.

It features a combination of transistor gain, op-amp gain and diode-based hard clipping to get its character. The tone control is the classic Big Muff “balance” style, centered around 1.3Khz with a very slight mid-boost in the middle position.

The Jet Phaser’s adaptation is largely the same but with fewer controls. The output volume control is retained for the fuzz stage, but the tone control is simplified into a two-position switch with only “full bass” and “full treble” settings. The potentiometer on the AF-60 is much more usable.

The Antipode project has one modification, which is the addition of a gain control to allow the distortion level to be dialed back. In the original, the op-amp gain was fixed at 220, but with this control it can now get as low as 2, getting down into overdrive territory instead of full-on fuzz. With the gain control at maximum, the circuit is 100% identical to a vintage AF-60.

Note: This project uses a type of capacitor that has been temporarily discontinued by WIMA. Please see our news article about the issue and the substitution spreadsheet for project-specific recommendations. We are stocking a limited supply in the mean time. The build document has not yet been updated to reflect this.

Schematic

The schematic is in the vendor's build document, page 5. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 54 rows

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RefValueNormalizedTypeNotes
Resistors 22
R1100k100kMetal film resistor, 1/4W
R215k15kMetal film resistor, 1/4W
R3220k220kMetal film resistor, 1/4W
R4470k470kMetal film resistor, 1/4W
R5470k470kMetal film resistor, 1/4W
R615k15kMetal film resistor, 1/4W
R71k1kMetal film resistor, 1/4W
R810k10kMetal film resistor, 1/4W
R910k10kMetal film resistor, 1/4W
R1010k10kMetal film resistor, 1/4W
R112M22.2MMetal film resistor, 1/4W
R1210k10kMetal film resistor, 1/4W
R1333k33kMetal film resistor, 1/4W
R1433k33kMetal film resistor, 1/4W
R151M1MMetal film resistor, 1/4W
R16100k100kMetal film resistor, 1/4W
R1756k56kMetal film resistor, 1/4W
R1815k15kMetal film resistor, 1/4W
R196k86.8kMetal film resistor, 1/4W
R2022k22kMetal film resistor, 1/4W
R2122k22kMetal film resistor, 1/4W
LEDR4k74.7kMetal film resistor, 1/4WLED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 15
C122n22nFilm capacitor, 7.2 x 2.5mm
C210uF10uElectrolytic capacitor, 5mm
C310uF10uElectrolytic capacitor, 5mm
C410n10nFilm capacitor, 7.2 x 2.5mm
C510uF10uElectrolytic capacitor, 5mm
C6270pF270pMLCC capacitor, NP0/C0GOriginal is 250pF, but 220pf is the nearest readily-available value.
C747n47nFilm capacitor, 7.2 x 2.5mm
C82n22.2nFilm capacitor, 7.2 x 2.5mm
C91n1nFilm capacitor, 7.2 x 2.5mm
C1047n47nFilm capacitor, 7.2 x 2.5mm
C111uF1uFilm capacitor, 7.2 x 3.5mm
C1247n47nFilm capacitor, 7.2 x 2.5mm
C13100uF100uElectrolytic capacitor, 6.3mmPower supply filter capacitor.
C1447uF47uElectrolytic capacitor, 5mmReference voltage filter capacitor.
C15100n100nMLCC capacitor, X7RPower supply filter capacitor.
Diodes 3
D11N58171N5817Schottky diode, DO-41
D21N9141N914Fast-switching diode, DO-35
D31N9141N914Fast-switching diode, DO-35
Transistors 2
Q12N39042N3904BJT transistor, NPN, TO-92Substitute. Original uses 2SC1000GR.
Q22N39042N3904BJT transistor, NPN, TO-92Substitute. Original uses 2SC1000GR.
ICs 1
IC1LM741LM741Operational amplifier, DIP8Original uses TA7504, but LM741 is an equivalent.
Potentiometers 3
DIST.1MCC1M16mm right-angle PCB mount pot
TONE100kBB100k16mm right-angle PCB mount pot
LEVEL50kAA50k16mm right-angle PCB mount pot
Switches 1
FSW3PDT3PDTStomp switch, 3PDTAvailable from Aion FX.
LEDs 1
LED5mm5MMLED, 5mm, red diffused
Jacks & sockets 4
IC1-SDIP-8 socketDIP-8 SOCKETIC socket, DIP-8
IN1/4" stereo1/4" STEREO1/4" phone jack, closed frameSwitchcraft 112BX or equivalent.
OUT1/4" mono1/4" MONO1/4" phone jack, closed frameSwitchcraft 111X or equivalent.
DC2.1mm2.1MMDC jack, 2.1mm panel mountLumberg NEB/J 21 C or equivalent.
Hardware 2
BATTBattery snapBATTERY SNAP9V battery snapOptional. Use the soft plastic type—the hard-shell type will not fit.
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.

Other boards based on the Roland AF-60 Bee Gee

  • AF-60 Fuzz Dog · 1590B · £31.20
  • Ronald AF PCB Guitar Mania · 125B · €9.90