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Actual size is 2.3” x 2.43” (main board) and 2.3” x 0.86” (bypass board). IMPORTANT NOTE This documentation is for the PCB-only version of the project. If you are building the full kit from Aion FX, please use the kit build documentation instead. The instructions are more detailed and may differ in some areas due to the specialized parts and assembly methods used in our kits.
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.
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...
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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...
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.
BUFFER OUT FROM BUFFER OUT SW1A LEVEL MODE TO INPUT JACK SW1B 180R 330pF TO OUTPUT JACK J113 EFFECT OUT FROM EFFECT OUT TL072P SW1C IC1B IC1A 180R TL072P 220n SW1D TO FX GND BYP_GND 10uF 10uF 330pF CONVEX PARALLEL COMPRESSOR...
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