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DRIVETONEVOLUMEPRESENCE

125B · 4 knobs

Aion FX

AchillesAmp Overdrive

Based on the Analogman Prince of Tone· 1 other board clones it

Category
Overdrive· Amp-like overdrive
Controls
Drive · Tone · Volume · Presence
Difficulty
Easy
Price
$12.50in stock

From the vendor

A single-channel adaptation of the legendary King of Tone, with a few added features not found in the original dual-channel pedal.

The Achilles Amp Overdrive is based on the Analogman Prince of Tone, the single-channel adaptation of the King of Tone that was first released in 2012. Unlike the King of Tone, the Prince was designed for mass production and is assembled in China. As a result, it’s much more affordable as well as being readily available (the King of Tone has a 4½-year waiting list).

The Prince of Tone converts the internal diode DIP switch into an external toggle switch, allowing for soft clipping, hard clipping or no clipping to be selected without needing to open up the back. It also has the high gain mod from the King of Tone as standard.

Internally, in addition to the Presence control, there are two DIP switch settings that are new to this pedal. One of them adds low-mid frequencies to the first gain stage. The other is called “Turbo” mode that essentially doubles the gain of the second stage, meaning it reaches the clipping threshold sooner and has more apparent drive on tap.

The Achilles is a direct clone of the Prince of Tone with no modifications.

Note: The PCB-only version of 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. It does not impact the kits.

Schematic

The schematic is in the vendor's build document, page 6. Open the build document. No KiCad fragment has been drawn for this circuit yet.

Parts list 52 rows

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RefValueNormalizedTypeNotes
Resistors 18
R11M1MMetal film resistor, 1/4W
R210k10kMetal film resistor, 1/4W
R327k27kMetal film resistor, 1/4W
R433k33kMetal film resistor, 1/4W
R5100k100kMetal film resistor, 1/4W
R610k10kMetal film resistor, 1/4W
R710k10kMetal film resistor, 1/4W
R8220k220kMetal film resistor, 1/4W
R96k86.8kMetal film resistor, 1/4W
R101k1kMetal film resistor, 1/4W
R111k1kMetal film resistor, 1/4W
R126k86.8kMetal film resistor, 1/4W
R131M1MMetal film resistor, 1/4W
R1447k47kMetal film resistor, 1/4W
R1547k47kMetal film resistor, 1/4W
R16100R100Metal film resistor, 1/4WPower supply filter resistor.
RPD1M1MMetal film resistor, 1/4WInput pull-down resistor.
LEDR10k10kMetal film resistor, 1/4WLED current-limiting resistor. Adjust value to change LED brightness.
Capacitors 15
C122n22nFilm capacitor, 7.2 x 2.5mm10n in some units.
C2100pF100pMLCC capacitor, NP0/C0G750pF in some units.
C310n10nFilm capacitor, 7.2 x 2.5mm
C41uF1uFilm capacitor, 7.2 x 3.5mm
C510n10nFilm capacitor, 7.2 x 2.5mm
C6100n100nFilm capacitor, 7.2 x 2.5mm
C747pF47pMLCC capacitor, NP0/C0GNot in original pedal, but recommended to prevent high-end oscillation.
C810n10nFilm capacitor, 7.2 x 2.5mm
C910n10nFilm capacitor, 7.2 x 2.5mm
C101uF1uFilm capacitor, 7.2 x 3.5mm
C111uF1uElectrolytic capacitor, 4mm
C12100uF100uElectrolytic capacitor, 6.3mmReference voltage filter capacitor.
C13100uF100uElectrolytic capacitor, 6.3mmPower supply filter capacitors.
C14100n100nMLCC capacitor, X7RPower supply filter capacitors.
C15100n100nFilm capacitor, 7.2 x 3.5mm
Diodes 5
D11N58171N5817Schottky diode, DO-41
D2BAS33BAS33Switching diode, DO-35
D3BAS33BAS33Switching diode, DO-35Original uses MA856 diodes. The BAS33 is the closest available diode
D4BAS33BAS33Switching diode, DO-35currently in production.
D5BAS33BAS33Switching diode, DO-35
ICs 2
IC1JRC4580DJRC4580DOperational amplifier, DIP8
MODE2-pos. DIP2-POS. DIPDIP switch, 2-position
Potentiometers 3
DRIVE100kBB100k16mm right-angle PCB mount pot
TONE25kBB25k16mm right-angle PCB mount pot
VOL.100kAA100k16mm right-angle PCB mount pot
Trimmers 1
PRES.50k50kTrimmer, 10%, 1/4”
Switches 2
CLIPDPDT cntr. offDPDT CNTR. OFFToggle switch, DPDT on-off-on
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 1
ENC125B125BEnclosure, die-cast aluminumCan also use a Hammond 1590N1.

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