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aion AMETHYST Manual

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Table of Contents

PROJECT NAME
AMETHYST
BASED ON
®
BOSS
DM-2 Delay
EFFECT TYPE
Analog delay
PROJECT SUMMARY
One of the first analog delay effects to use a bucket brigade chip, and still widely considered among the
best analog delays ever designed.
Actual size is 2.3" x 2.42" (main board) and 1.78" x 0.91" (bypass board).
AMETHYST ANALOG DELAY
BUILD DIFFICULTY
Advanced
DOCUMENT VERSION
1.0.0 (2024-04-19)
1

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Summary of Contents for aion AMETHYST

  • Page 1 One of the first analog delay effects to use a bucket brigade chip, and still widely considered among the best analog delays ever designed. Actual size is 2.3” x 2.42” (main board) and 1.78” x 0.91” (bypass board). AMETHYST ANALOG DELAY...

  • Page 2: Table Of Contents

    15 Document Revisions INTRODUCTION The Amethyst Analog Delay is based on the BOSS DM-2, which was originally released in 1981 and is still widely considered to be one of the best delay pedals ever made. The DM-2 circuit uses the...

  • Page 3: Parts List

    Metal film resistor, 1/4W 47.5k for Aqua Puss. Metal film resistor, 1/4W 47.5k for Aqua Puss. Metal film resistor, 1/4W Metal film resistor, 1/4W 47.5k for Aqua Puss. 470R Metal film resistor, 1/4W 150R for Aqua Puss. AMETHYST ANALOG DELAY...
  • Page 4 Electrolytic capacitor, 4mm 10uF electrolytic for Aqua Puss. 100n Film capacitor, 7.2 x 2.5mm 220n for Aqua Puss. Film capacitor, 7.2 x 3.5mm 10uF electrolytic for Aqua Puss. 100pF MLCC capacitor, NP0/C0G Film capacitor, 7.2 x 2.5mm AMETHYST ANALOG DELAY...
  • Page 5 Switchcraft 111X or equivalent. 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent. 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. AMETHYST ANALOG DELAY...

  • Page 6: Build Notes

    (reproductions available from Xvive), while the second version used the MN3205 (reproductions available from Coolaudio as the v3205). The Amethyst project is set up to allow either type to be used by soldering two jumpers in one configuration or another.
  • Page 7 PCB. You can solder leftover resistor leads to these pads to make them easier to reach if everything is already installed to the enclosure. Note that the positive pad is on the right, the reverse of TP1 & TP3. AMETHYST ANALOG DELAY...
  • Page 8 This will be updated in a future revision of the Amethyst. For the initial release, if you want the delay to get longer as you turn up the knob, you will need to reverse lugs 1 and 3 of the Delay pot.
  • Page 9 • R5-6, R28-29, R31: 47k → 47.5k • R15: 10k → 100k • R32: 470R → 150R • IC1: JRC4558D → LF353N • Q1-4: 2N5088 → MPSA18 The full schematic showing Aqua Puss values can be found on page 11. AMETHYST ANALOG DELAY...

  • Page 10: Schematics

    2N5088 330pF IC1A JRC4558D 2N5088 IC2A NE571 OMIT 10uF 220n GND GND IC1B JRC4558D 100pF 470R 100pF OUT1 OUT2 10uF GND2 GND2 MN3005 GND2 2N5088 2N5088 330pF 100n OMIT MN3101 IC2B NE571 GND2 GND2 GND2 100pF 220n AMETHYST ANALOG DELAY...
  • Page 11 NE571 10uF 470pF 10uF 220n 47.5k GND GND IC1B 47.5k LF353N 100pF 150R 47.5k 100pF 47.5k OUT1 OUT2 10uF GND2 GND2 MN3005 GND2 MPSA18 MPSA18 10uF 330pF 220n 100n MN3101 IC2B NE571 GND2 GND2 GND2 100pF 220n AMETHYST ANALOG DELAY...

  • Page 12: Drill Template

    INCH 0.625” 0.625” ø3/8” ø3/8” ø1/2” DELAY FEEDBACK x: -0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” VOLUME x: 0, y: +0.66 ø9/32” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.775 x: 0, y: -1.775 ø5/16” ø15/32” AMETHYST ANALOG DELAY...

  • Page 13: Enclosure Layout

    ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B AMETHYST ANALOG DELAY...

  • Page 14: Wiring Diagram

    WIRING DIAGRAM OUT NC GND GND +V +V JACK GND JACK GND GND 125B AMETHYST ANALOG DELAY...

  • Page 15: 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 (2024-04-19) Initial release. AMETHYST ANALOG DELAY...

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