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SK-1DI Mic DI Assembly Guide

3. ASSEMBLY GUIDE

BEFORE YOU BEGIN: Pick a clean work area where you can leave your work-in-progress unattended if you need to.

Keep individual components in their labeled zip bag until you’re ready to solder them. Kit components have been sorted and

labeled for your convenience. The labeled components lessens chances of insertion errors, inserting the wrong component into

the wrong location. Keeping the components in their zip bags also reduces chance of small parts getting lost or misplaced.

Best practice is to solder the smallest and/or shortest components first. Then solder the taller and larger components next. Big

bulkier components like switches, jacks, big capacitors are soldered last.

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

Summary of Contents for SK-1DI

Page 2: ...cally 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 Copyright 2017 FiveFish Audio fivefishaudio com Assembly Guide Revision 1 4 20170214 ...

Page 3: ...This assembly guide is a work in progress and we re continually working to improve it As always we welcome the input of the DIY community if you have any comments suggestions or additional information that you think will be helpful for inclusion in this assembly guide If you have any questions that are not covered by this assembly guide please feel free to contact us at www fivefishaudio com or vi...

Page 4: ...esult in personal injury Grounding one conductor of a two conductor outlet is not sufficient protection This mic preamp module is designed to be plug in into an API 500 series rack or compatible unit DC Power is supplied by the 500 series rack to this module It is strongly suggested that you use a lab power supply the first time you power your mic preamp project If you made any mistake during asse...

Page 5: ...om 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...

Page 6: ...ll to medium sized soldering tip is required to solder the small parts You may use Lead free or 60 40 lead based solder 2 2 Cutter You will need a cutter to cut component leads and wires 2 3 Solder Sucker Pump If you made a mistake and need to desolder a component you ll need one 2 4 Multitester Used for measuring resistance continuity and voltages 2 5 Magnifier Lamp I recommend a clean and well l...

Page 7: ...ens chances of insertion errors inserting the wrong component into the wrong location Keeping the components in their zip bags also reduces chance of small parts getting lost or misplaced Best practice is to solder the smallest and or shortest components first Then solder the taller and larger components next Big bulkier components like switches jacks big capacitors are soldered last NOTE The phot...

Page 9: ...I Assembly Guide 3 2 Solder all Signal Diodes and Rectifier Diodes 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 ...

Page 11: ...ht 2017 FiveFish Audio SK 1DI Mic Preamp DI Assembly Guide 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 ...

Page 12: ...p DI Assembly Guide 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 ...

Page 13: ...n and secure 7812 metal tab with machine screw and nut If your kit came with A18W K Relays Do NOT install the 7812 Voltage Regulator Instead solder a JUMPER wire across pin 1 and pin 3 of IC4 location 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 ...

Page 15: ...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 ...

Page 16: ...Copyright 2017 FiveFish Audio SK 1DI Mic Preamp DI Assembly Guide 3 8 Solder Q1 Transistor IMPORTANT Observe proper orientation and the direction transistor is facing Follow the PCB silkscreen markings ...

Page 17: ...e the same color arrangement on all mic preamp kits you ll build A typical color arrangement may be GREEN for phantom power switch BLUE for 20dB Pad YELLOW for polarity reverse RED for Mic Instrument selector switch IMPORTANT The LONG LEG of the LED must be oriented at the BOTTOM position as shown NOTE LEDs are installed from the bottom Bend LED legs as shown on photos NOTE PCB Rev 1 2 does NOT ne...

Page 18: ...led holes on your aluminum sled You can use anywhere from a 1 16 hole up to 1 8 hole size The larger drill hole size means alignment is less critical Green LED Blue LED Yellow LED Red LED NOTE The LEDs are mounted at the bottom of the PCB Smaller sized holes look better as they re not too overpowering bright when lit up You will also need to enlarge the hole on the aluminum sled for the 1 4 TRS ja...

Page 19: ...ure they re mounted horizontally level and not crooked or mis aligned 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 ...

Page 20: ...Copyright 2017 FiveFish Audio SK 1DI Mic Preamp DI Assembly Guide 3 12 Solder all medium sized 220uf electrolytic capacitors IMPORTANT Observe proper polarity and orientation of and leads ...

Page 22: ...io SK 1DI Mic Preamp DI Assembly Guide 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 ...

Page 23: ...7 FiveFish Audio SK 1DI Mic Preamp DI Assembly Guide 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 ...

Page 24: ...Copyright 2017 FiveFish Audio SK 1DI Mic Preamp DI Assembly Guide 3 16 Install the optional Output Transformer IMPORTANT If not using an Output Transformer solder jumper wires instead as shown below ...

Page 28: ...ylic Front Panel unless you drill 5 additional 1 8 holes for the LEDs The Anodized Aluminum Front Panel upgrade will have the necessary holes for the VU Meter LEDs If there is enough requests for VU Meters for use with the Acrylic Front Panel we will create an alternate Acrylic Front Panel design with the VU Meter LED holes So let us know what you think NOTE If you have PCB Rev1 00 and wish to ins...

Page 29: ...017 FiveFish Audio SK 1DI Mic Preamp DI Assembly Guide 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 ...

Page 30: ...t acrylic front panel Tighten nuts of potentiometer and 1 4 TRS jack Then install knobs 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 ...

Page 31: ...uide 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 48V Phantom Power 20dB Pad Polarity Reverse Mic Instrument DI Select 1 4 Instrument Input Gain Control ...

Page 32: ...Copyright 2017 FiveFish Audio SK 1DI Mic Preamp DI Assembly Guide 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 ...

Page 33: ...oard follow these additional steps 3 24 1 Solder the 12 resistors using the PCB Component Guide below 3 24 2 Solder the Grayhill selector switch 3 24 3 Wire the Switch Adapter Board as shown in the photo below RL 10R RK 5R76 RJ 10R RI 14R3 RH 23R2 RG 36R5 RF 62R RE 162R RD 357R RC 750R RB 1K91 RA 6K65 PCB Top View Schematic Diagram ...

Page 34: ...pad on preamp board Green wire goes to bottom pad on preamp board Of course you may use your own colored wires Above is just an example for illustration purposes The Switch Board needs to be installed upside down as shown in photo above Tighten nut when done installing board Also shown in photo above is the optional VU Meter Board ...

Page 38: ...rcuit bridges 5 2 Check if all diodes are installed in correct orientation 5 3 Check if all polarized electrolytic capacitors are installed in correct orientation 5 4 Check if all relays are installed in correct orientation 5 5 Check if jumper to bypass IC4 is required only required if using A12W K Relays 5 6 Check if jumper wires are required for Output Transformer location if not using an Output...

Page 45: ... 3 16 When I turn the gain knob clockwise the sound decreases instead of increasing At minimum gain setting I have a very loud output signal It s backwards Please review Step 3 15 and look closely at how the wires are connected to the potentiometer You need to swap the location of your 2 wires if your gain is backwards I hear a popping sound when I switch from DI Instrument to Mic Input I m using ...

Page 46: ...ntom power to your SK 1DI 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 48V DC 16V to 18V DC GND 16V to 18V DC CHASSIS GND XLR OUT ...

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