FiveFish SK-1DI, Assembly Manual

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Copyright © 2017 FiveFish Audio SK-1DI Mic DI Assembly Guide
GENERAL INFORMATION
1. DESCRIPTION
The SK-1DI Kit is a high-performance, low-noise Mic Preamp and Direct Inject (DI) combo unit for use with API 500 Series
lunchboxes or racks.
The SK-1DI design utilizes the high-performance THAT preamplifier chip and balanced line drivers. Preamp gain is set by a simple
resistor, which can either be a single-turn potentiometer or a 12-step selector switch with the necessary resistor ladder values. The
basic stock SK-1DI kit is supplied with the single-turn potentiometer but can be upgraded to use a 12-step selector switch later
on. There is also RFI input and output protection, and built-in 48V short-circuit protection to protect the preamp from damage and
radio frequency interference.
The SK-1DI uses separate push-button switches for 48V Phantom Power, -20dB Pad, Polarity Reverse, and Mic/DI Input selection.
The kit builder can also wire optional 3mm LED indicators for each switch to indicate when the function is enabled.
The SK-1DI also features a built-in DI input for high-impedance instruments like electric guitars, bass guitars, etc. A push-button
switch is used to select either Mic-level or DI-input to the unit. A 1/4” TRS jack is provided on the front panel.
The SK-1DI allows the kit builder to install an optional Output Transformer, and a 5-LED VU Meter board. These extra options are
not necessary for the preamp’s operation, but is provided as an upgrade path. The Output Transformer and 5-LED VU Meter kit
are a separate purchase and not part of the basic SK-1DI kit package.
The SK-1DI requires a dual power supply (+/-15V to +/-18 Volts) and +48Volts for phantom power for proper operation.