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PROJECT NAME
PROCYON
BASED ON
BJFe Honey Bee Overdrive
EFFECT TYPE
Overdrive
PROJECT SUMMARY
One of the original hand-made boutique pedals, originally modeled after vintage Supro amps and noted
for its dynamic low-gain tone.
Actual size is 2.3" x 1.86" (main board) and 1.78" x 0.87" (bypass board).
PROCYON NATURAL OVERDRIVE
BUILD DIFFICULTY
Easy
DOCUMENT VERSION
1.0.0 (2023-11-24)
1
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Table of Contents
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Summary of Contents for aion PROCYON
- Page 1 1.0.0 (2023-11-24) PROJECT SUMMARY One of the original hand-made boutique pedals, originally modeled after vintage Supro amps and noted for its dynamic low-gain tone. Actual size is 2.3” x 1.86” (main board) and 1.78” x 0.87” (bypass board). PROCYON NATURAL OVERDRIVE...
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Page 2: Table Of Contents
10 Document Revisions INTRODUCTION The Procyon Natural Overdrive is a clone of the BJFe Honey Bee Overdrive, a circuit first released in 2002 that is credited for starting the “low gain overdrive” trend. The circuit itself is a rather unique overdrive design, incorporating both soft and hard clipping and utilizing frequency-dependent negative feedback from different points in the circuit, for a result that is often called “amplike”... -
Page 3: Parts List
Film capacitor, 7.2 x 3.5mm Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 2.5mm 220n Film capacitor, 7.2 x 2.5mm Film capacitor, 7.2 x 3.5mm Film capacitor, 7.2 x 2.5mm PROCYON NATURAL OVERDRIVE... - Page 4 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent. 3PDT Stomp switch, 3PDT BATT. 9V battery snap Soft vinyl type. The hard-shell type will not fit. 125B Enclosure, die-cast aluminum Can also use a Hammond 1590N1. PROCYON NATURAL OVERDRIVE...
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Page 5: Build Notes
BUILD NOTES Variants We compared several versions of the HBOD for the Procyon V2 and found that many of the components had different values across the versions. Here are the circuits we referenced: • Original BJFe (2 units from FSB trace) •... -
Page 6: Schematic
5k1 in BJF kit version I is a variable bass boost (Q1 source bypass) 110n middle (less bass) 4k7 in Bearfoot and One Control II is variable hi-cut at the end of the circuit 330n top (more bass) PROCYON NATURAL OVERDRIVE... -
Page 7: Drill Template
-0.65, y: +1.71 x: 0.65, y: +1.71 ø9/32” ø9/32” MODE NATURE 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” PROCYON NATURAL OVERDRIVE... -
Page 8: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B PROCYON NATURAL 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. PROCYON NATURAL OVERDRIVE... -
Page 10: Document Revisions
Complete overhaul based on new research. Added toggle switches inspired by the One Control version. 1.0.1 (2021-11-23) Corrected R8 to 147k based on likely inaccurate FSB trace dating back more than 10 years. The previous version of the build doc showed 47k. 1.0.0 (2018-08-22) Initial release. PROCYON NATURAL OVERDRIVE...
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