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ACHILLES AMP OVERDRIVE

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PROJECT NAME

ACHILLES

BASED ON

EFFECT TYPE

PROJECT SUMMARY

DOCUMENT VERSION

Analogman Prince of Tone

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

Amp-like overdrive

1.0.0 (2022-04-08)

BUILD DIFFICULTY

Easy

Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.87” (bypass board).

Summary of Contents for ACHILLES

Page 1: ...MENT VERSION Analogman Prince of Tone A single channel adaptation of the legendary King of Tone with a few added features not found in the original dual channel pedal Amp like overdrive 1 0 0 2022 04 08 BUILD DIFFICULTY Easy Actual size is 2 3 x 1 86 main board and 1 78 x 0 87 bypass board ...

Page 2: ...tch 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 USAGE The Achilles has four external controls Drive con...

Page 3: ...istor 1 4W R14 47k Metal film resistor 1 4W R15 47k Metal film resistor 1 4W R16 100R Metal film resistor 1 4W Power supply filter resistor LEDR 4k7 Metal film resistor 1 4W LED current limiting resistor Adjust value to change LED brightness C1 22n Film capacitor 7 2 x 2 5mm 10n in some units C2 100pF MLCC capacitor NP0 C0G 750pF in some units C3 10n Film capacitor 7 2 x 2 5mm C4 1uF Film capacito...

Page 4: ...DIP DIP switch 2 position PRES 50k trimmer Trimmer 10 1 4 DRIVE 100kB 16mm right angle PCB mount pot TONE 25kB 16mm right angle PCB mount pot VOL 100kA 16mm right angle PCB mount pot CLIP DPDT cntr off Toggle switch DPDT on off on LED 5mm LED 5mm red diffused IN 1 4 stereo 1 4 phone jack closed frame Switchcraft 112BX or equivalent OUT 1 4 mono 1 4 phone jack closed frame Switchcraft 111X or equiv...

Page 5: ...14 and only slightly lower than the MA856 We ve compared the curves on a Peak DCA75 and confirmed that they closely match the MA856 across the current test range The only problem is that the BAS33 went end of life in early 2022 Availability is still high but eventually they ll join the ranks of the others Clipping switch The DPDT on off on switch allows for three settings soft clipping diodes in o...

Page 6: ...k 6k8 1k 10n VB 6k8 50kB 10n VB VB 1uF 1uF 1M GND 10k 47k 47k GND 100uF GND VB 1uF VB 100k 100R 1k 47pF IN OUT RPD D1 C13 C14 VOLUME 1 2 3 TONE 1 2 3 DRIVE 1 2 3 C1 2 3 1 IC1A 6 5 7 IC1B 8 4 C2 R2 R1 R3 R4 C3 C5 R6 C6 R8 R9 D4 D5 D2 D3 R10 C8 R12 PRESENCE 1 2 3 C9 C10 C11 R13 SW1B 3 4 SW1A 1 2 R7 R14 R15 C12 C4 CLIPPING A A2 A3 A1 B2 B3 B1 CLIPPING B R5 R16 R11 C7 GND ...

Page 7: ... closed frame jacks like the Switchcraft 111X If you d rather use open frame jacks please refer to the Open Frame Jack Drill Template for the top side LED hole drill size assumes the use of a 5mm LED bezel available from several parts suppliers Adjust size accordingly if using something different such as a 3mm bezel a plastic bezel or just a plain LED x 0 65 y 1 71 x 0 65 y 1 71 ø9 32 ø9 32 x 0 85...

Page 8: ...ACHILLES AMP OVERDRIVE 8 ENCLOSURE LAYOUT Enclosure is shown without jacks See next page for jack layout and wiring 125B ...

Page 9: ...ACHILLES AMP OVERDRIVE 9 WIRING DIAGRAM 125B IN V GND N C N C OUT PCB IN GND V V JACK GND JACK OUT IN GND GND PCB OUT ...

Page 10: ... as suggestions based on the experience and opinions of others Projects may be used for commercial endeavors in any quantity unless specifically noted No attribution is necessary though a link back is always greatly appreciated The only usage restrictions are that 1 you cannot resell the PCB as part of a kit without prior arrangement and 2 you cannot goop the circuit scratch off the screenprint or...

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