FiveFish SK-1DI Assembly Manual

Mic preamp + di kit

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FiveFish

Studios

SK-1DI Mic Preamp + DI Kit

Assembly Guide

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Page 2 No part of this document may be reproduced, either mechanically or electronically, posted online on the Internet, in whole or in part, without the expressed, written permission of FiveFish Audio. This document is solely provided to the kit builder of the SC-1KDI Mic Preamp.
Page 3 Studios Dear Customer, Thank you for purchasing our SK-1DI Mic Preamp + DI Kit. Great care has been taken to make this assembly guide complete and as accurate as possible. Our goal is to make your assembly work easy and trouble-free, and deliver to you a working, reliable, and high-performance mic preamplifier.
Page 4: Safety Considerations
(The in-line fuses will blow if there is correctly performed could result in damage to your overcurrent or short-circuit condition, thus protecting the equipment, electronic component or personal injury. rack power supply). SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 5: General Information
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.
Page 6: Tools And Equipment Required
2.5. Magnifier & Lamp - I recommend a clean and well-lighted space for your assembly area. 2.6. Other Tools (not required, but nice to have) - Component lead bender, vise, tweezers, wire stripper. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 7: Assembly Guide
NOTE: The photos shown on this assembly guide are Rev.1.2 PCBs. Your PCB Revision may be later but assembly instructions are generally the same. Photo of a finished SK-1DI 500 Series Kit SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 9 IMPORTANT: Diodes must be installed in the correct orientation. Observe where the “white band” is located on the board silkscreen marking, and orient the Diodes to follow the same direction. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 11 3.4 Solder the (3) IC Sockets. TIP: One side of the IC socket will have a notch. Position this notch on the left-side for use as a guide for Pin1 location. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 12 3.5 Solder the (3) PDIP Relays. Take note of the Relay part number that came with your kit and follow the next step. IMPORTANT: Insert Relays in proper orientation. Match the “white band” on PCB silkscreen with the Relay’s line markings. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 13 Note: Photos on this guide show A18W-K relays with a 7812 Regulator also installed. This combination will also work, but the 7812 Regulator is not really necessary in this case. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 15 3.7 Solder all small Electrolytic Capacitors. These capacitors have polarity markings, one lead is (+) and the other lead is (-). IMPORTANT: Observe the proper polarity when inserting these capacitors. Match polarity with PCB silkscreen markings. All negative (-) leads of electrolytic capacitors are orientated facing downwards. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 16 3.8 Solder Q1 Transistor. IMPORTANT: Observe proper orientation and the direction transistor is facing. Follow the PCB silkscreen markings. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 17 - for 20dB Pad, YELLOW - for polarity reverse, - for Mic/Instrument selector switch. IMPORTANT: The LONG LEG of the LED must be oriented at the BOTTOM position as shown. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 18 NOTE: The LEDs are mounted at the bottom of the PCB. Yellow LED Red LED You will also need to enlarge the hole on the aluminum sled for the 1/4” TRS jack. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 19 TIP: You may use masking tape to hold the switch secure in it’s place while you solder. Solder only one of the switch terminals and review if the switch is still horizontally level. If everything looks good, solder the rest of the switch terminals. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 20 3.12 Solder all medium-sized 220uf electrolytic capacitors. IMPORTANT: Observe proper polarity and orientation of (+) and (-) leads. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 22 3.14 Solder the 1/4” TRS Instrument Jack. Make sure to mount TRS jack level and flat as possible with the PCB. You may need to push the TRS jack down to be flat as possible, then solder the legs. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 23 3.15 Solder the 10K Potentiometer as shown below. Use a couple short pieces of wire to connect potentiometer to the board. Connect top and middle terminals together. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 24 3.16 Install the optional Output Transformer. IMPORTANT: If not using an Output Transformer, solder jumper wires instead as shown below: SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 28 VU Meter LED holes. So let us know what you think! NOTE: If you have PCB Rev1.00 and wish to install the VU METER KIT, Please contact us for an EXCLUSIVE OFFER! SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 29 3.21 Install mounting spacers to PCB using the Aluminum Male-Female Hex Spacers and 4-40 nuts. Then mount PCB to aluminum sled using the provided small screws. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 30 IMPORTANT: Do not overtighten nuts to avoid damaging the Acrylic Front Panel. NOTE: Anodized 0.125” aluminum CNC-engraved Front Panels are also available as an upgrade option. Contact FiveFish Audio for details. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 31 Polarity Reverse Mic/Instrument DI Select 1/4” Instrument Input NOTE: SK-1DI Kit comes with a 3mm Transparent Gray Acrylic front panel. The lighted LEDs show through very nicely through the tinted transparent front panel. SK-1DI Mic Preamp + DI Assembly Guide...
Page 32 3.23 Finally, insert the (3) IC chips into their IC sockets. IC1 = THAT 1510; IC2 = OPA2134; IC3 = THAT 1646 THAT 1646 THAT 1510 OPA 2134 SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 34 (Of course, you may use your own shown in photo above is the optional VU Meter Board.) colored wires. Above is just an example for illustration purposes.) SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 38: Pre-Flight Check
5.6 Check if jumper wires are required for Output Transformer location (if not using an Output Transformer). 5.7 Check if IC1, IC2, and IC3 are inserted in their correct locations and oriented correctly. SK-1DI Mic Preamp + DI Assembly Guide Copyright © 2017 FiveFish Audio...
Page 45: Troubleshooting Information
9. TROUBLESHOOTING INFORMATION Hey, we’re all human and make mistakes. Hopefully the tips below will help you troubleshoot your SK-1DI Mic Preamp build. I have no output signal. All LED lights work, and I can hear the relays clicking. The VU Meter also display signals but I don’t hear anything on the output.
Page 46 10. RACK MOUNTING THE SK-1DI MIC PREAMP MODULE You may also mount the SK-1DI inside a custom 1u 19” rack case. Just supply the SK-1DI module with the necessary +/- voltag- es, and connect to XLR male and female jacks. Use the wiring guide below. You can use a 15-pin EDAC connector, or solder the connection wires directly to the holes provided on rear of the board.

FiveFish SK-1DI Assembly Manual

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Summary of Contents for FiveFish SK-1DI

Page 4: Safety Considerations

Page 5: General Information

Page 6: Tools And Equipment Required

Page 7: Assembly Guide

Page 38: Pre-Flight Check

Page 40: Parts List

Page 42: Schematic Diagram

Page 45: Troubleshooting Information

FiveFish SK-1DI Assembly Manual

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Summary of Contents for FiveFish SK-1DI