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PROJECT NAME
CONVEX
BASED ON
Dinosaural OTC-201 Opticompressor
EFFECT TYPE
Parallel Optical Compressor
PROJECT SUMMARY
An exceptionally rare and unique optical compressor designed by Dan Coggins of Lovetone fame.
Actual size is 2.3" x 2.43" (main board) and 2.3" x 0.86" (bypass board).
CONVEX PARALLEL COMPRESSOR
BUILD DIFFICULTY
Intermediate
DOCUMENT VERSION
1.0.3 (2019-08-21)
1
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Summary of Contents for Aion Electronics Convex
- Page 1 DOCUMENT VERSION Parallel Optical Compressor 1.0.3 (2019-08-21) PROJECT SUMMARY An exceptionally rare and unique optical compressor designed by Dan Coggins of Lovetone fame. Actual size is 2.3” x 2.43” (main board) and 2.3” x 0.86” (bypass board). CONVEX PARALLEL COMPRESSOR...
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Page 2: Table Of Contents
The Convex is a direct clone of the original OTC-201, with two modifications. First, the internal Mode switch has been moved to the outside, so the blend/direct modes can be more conveniently switched between. -
Page 3: Parts List
Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Metal film resistor, 1/4W Input pulldown resistor. Can be as low as 1M. LEDR Metal film resistor, 1/4W LED current-limiting resistor. Adjust value to change LED brightness. CONVEX PARALLEL COMPRESSOR... - Page 4 Substitute. Original uses J113. 2N5088 BJT transistor, NPN, TO-92 Substitute. Original uses BC549C. 2N5087 BJT transistor, PNP, TO-92 Substitute. Original uses BC307B. 2N5087 BJT transistor, PNP, TO-92 Substitute. Original uses BC307B. 2N5088 BJT transistor, NPN, TO-92 Substitute. Original uses BC549C. CONVEX PARALLEL COMPRESSOR...
- Page 5 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. CONVEX PARALLEL COMPRESSOR...
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Page 6: Build Notes
Being from the UK, the original OTC-201 uses BC549C NPN and BC307B PNP transistors in the vactrol section. The Convex board is designed for USA equivalents: 2N5088 or 2N3904 for NPN and 2N5087 or 2N3906 for PNP. They will perform identically in this circuit and are more commonly available worldwide. -
Page 7: Schematic
BUFFER OUT FROM BUFFER OUT SW1A LEVEL MODE TO INPUT JACK SW1B 180R 330pF TO OUTPUT JACK 2N5457 EFFECT OUT FROM EFFECT OUT TL072P SW1C IC1B IC1A 180R TL072P 220n SW1D TO FX GND BYP_GND 10uF 10uF 330pF CONVEX PARALLEL COMPRESSOR... -
Page 8: Drill Template
BALANCE SUSTAIN x: -0.65, y: +1.71 x: +0.65, y: +1.71 ø9/32” ø9/32” MODE LEVEL x: -0.65, y: +0.41 x: +0.65, y: +0.41 ø1/4” ø1/4” CENTER (0,0) FOOTSWITCH x: -0.775, y: -1.775 x: 0, y: -1.775 ø5/16” ø15/32” CONVEX PARALLEL COMPRESSOR... -
Page 9: Enclosure Layout
ENCLOSURE LAYOUT Enclosure is shown without jacks. See next page for jack layout and wiring. 125B CONVEX PARALLEL COMPRESSOR... -
Page 10: Wiring Diagram
WIRING DIAGRAM F.GND GND BUF FX +V JACK GND JACK GND BUF 125B CONVEX PARALLEL COMPRESSOR... -
Page 11: Document Revisions
The guitar effects industry needs more transparency, not less!) DOCUMENT REVISIONS 1.0.3 (2019-08-21) Corrected taper of Balance pot. 1.0.2 (2019-08-11) Corrected D2 & D3 in parts list. 1.0.1 (2019-08-07) Added Q1-5 to parts list. 1.0.0 (2019-08-04) Initial release. CONVEX PARALLEL COMPRESSOR...
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