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Oakley Modular Euro Journeyman – Classic Diode Ring Filter
$30.00 - $249.00
The Journeyman is a 6HP, four-pole, dual-mode filter module featuring a unique, non-linear discrete circuit inspired by 1970s Japanese Traveller filters [1]. It offers switchable -12dB/octave low-pass or -6dB/octave high-pass responses, with notable sonic characteristics when stacked in series [1].
Key features include:
- Filter Core: Single-ended discrete design utilizing four matched NPN transistor junctions as control elements [1].
- Drive & Resonance: A dedicated 'drive' pot allows for overdriving the signal without altering output volume, while high resonance settings enable self-oscillation across most of the audio spectrum [1].
- CV Control: Features two inputs; CV1 provides 1V/octave tracking, and CV2 offers variable depth (up to 0.5V/octave) with a polarity inversion switch [1].
- Power: Requires +/-20mA at +/-12V [1].
The Journeyman module comprises of two printed circuit boards (PCBs) connected together with four 0.1” (2.54mm) single in line (SIL) headers and sockets. The main board on the rear of the module houses the power input and conditioning, the filter core, and CV processing circuitry. The pot board has the pots, switch, and sockets that are attached to the front panel, as well as the overdrive control and CV summing circuits. The main board is a four layer design, while the pot board is a two layer design. Each board is the same size; 29 mm x 107 mm.
The majority of the components are surface mount parts. The ICs are SOIC, while the resistors and surface mount capacitors are 0805. All components are standard parts.
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