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PROJECT NAME
HORIZON
BASED ON
Catalinbread Dirty Little Secret Mk. I
EFFECT TYPE
Overdrive
PROJECT SUMMARY
An "amp in a box" drive pedal inspired by the sounds of 1970s Marshall amplifiers.
Actual size is 2.3" x 1.86" (main board) and 2.3" x 0.86" (bypass board).
HORIZON AMP OVERDRIVE
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.0 (2018-09-22)
1

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Summary of Contents for aion HORIZON

  • Page 1 EFFECT TYPE DOCUMENT VERSION Overdrive 1.0.0 (2018-09-22) PROJECT SUMMARY An “amp in a box” drive pedal inspired by the sounds of 1970s Marshall amplifiers. Actual size is 2.3” x 1.86” (main board) and 2.3” x 0.86” (bypass board). HORIZON AMP OVERDRIVE...
  • Page 2: Table Of Contents

    6 Drill Template INTRODUCTION The Horizon Amp Overdrive is a recreation of the Catalinbread Dirty Little Secret Mk I, a unique drive pedal that resembles a Marshall amp stack in its response and tone. The DLS Mk I was the first of three versions, and is often considered the best—or at least, different enough that subsequent versions should have been released as new pedals.
  • Page 3: Parts List

    MLCC capacitor, NP0/C0G 220n Film capacitor, 7.2 x 2.5mm 4.7uF Electrolytic capacitor, 4mm Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm 470pF MLCC capacitor, NP0/C0G 200pF MLCC capacitor, NP0/C0G 47pF MLCC capacitor, NP0/C0G 220pF MLCC capacitor, NP0/C0G HORIZON AMP OVERDRIVE...
  • Page 4 DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. BATT Battery snap 9V battery snap Optional. Use the soft plastic type—the hard-shell type will not fit. 3PDT Stomp switch, 3PDT 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. HORIZON AMP OVERDRIVE...
  • Page 5 If you can’t find JFETs with the right specifications, note that just about any general-purpose JFET will sound good in this circuit. But, you’ll find that something with a higher V will go into clipping later, reducing the total amount of drive available to the circuit and changing the characteristics of the effect. HORIZON AMP OVERDRIVE...
  • Page 6: Schematic

    SCHEMATIC 1N5817 100uF 100n 2N5457 220n ROCKB 2N5457 10uF 2N5457 2N5457 2N5457 ROCKA 200k 100pF 47pF 220pF 2N5457 470k 47pF HORIZON AMP OVERDRIVE...
  • Page 7: Drill Template

    0.65, y: +1.71 ø9/32” ø9/32” ROCK/RAWK TONE BRIGHT x: -0.85, y: +0.66 x: 0, y: +0.66 x: +0.85, y: +0.66 ø1/4” ø9/32” ø1/4” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.20 x: 0, y: -1.20 ø5/16” ø15/32” HORIZON AMP OVERDRIVE...
  • Page 8: Enclosure Layout

    ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B HORIZON AMP OVERDRIVE...
  • Page 9: Wiring Diagram

    GND +V +V JACK GND JACK GND GND PCB 125B Shown with optional 9V battery. If battery is omitted, both jacks can be mono rather than one being stereo. Leave the far-right lug of the DC jack unconnected. HORIZON AMP OVERDRIVE...
  • Page 10: 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 (2018-09-22) Initial release. HORIZON AMP OVERDRIVE...

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