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FiveFish Studios PSU-2448mk2 Assembly Manual

Kit, regulated split power supply with +48v phantom power + protection fuses
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PSU-2448mk2 Power Supply Kit
Regulated Split Power Supply
With +48V Phantom Power + Protection Fuses
Simplicity Counts, Detail Matters.
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 Studios. This document is solely provided
to the kit builder of the PSU-2448mk2 Power Supply Kit.

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Summary of Contents for FiveFish Studios PSU-2448mk2

  • Page 1 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 Studios. This document is solely provided to the kit builder of the PSU-2448mk2 Power Supply Kit.
  • Page 2 Page 2 PSU-2448mk2 Power Supply Kit Copyright © 2010 FiveFish Studios www.fivefishstudios.com Last Update: 7/08/10...
  • Page 3 Page 3 PSU-2448mk2 Power Supply Kit PSU-2448mk2 KIT Power Supply for Mic Preamps and other OpAmp, InstAmp based projects Assembly Guide Rev 4.2 This is a split power supply designed to give positive and negative voltages and +48V phantom power. It has a small form factor, measuring only 2 inches x 5 inches x 1-1/8”...

  • Page 4: 110 Volt Operation

    Page 4 PSU-2448mk2 Power Supply Kit A POWER TRANSFORMER IS REQUIRED FOR PROPER OPERATION. DO NOT CONNECT THE 110/220V AC LINES DIRECTLY TO THE PSU PCB. For this discussion, I'm assuming you're using the 1U PWR-TRAFO kit that I'm selling.
  • Page 5 Page 5 PSU-2448mk2 Power Supply Kit Connect the BLACK wire to AC1 on PSU PCB. Connect the YELLOW wire to AC2 on PSU PCB.
  • Page 6 Page 6 PSU-2448mk2 Power Supply Kit Basic Tools Required A few basic tools are required to build this kit. Soldering iron – adjustable temperature recommended, but not necessary. Your soldering iron must have a sharp conical tip. I do not recommend a “flat-head, screwdriver-type” soldering iron. DO NOT USE A 100 WATT SOLDERING GUN.
  • Page 7 Page 7 PSU-2448mk2 Power Supply Kit Magnifying glass – to see what you’re doing! Clean and well-lighted work area – Lots of good lighting, clean work area. You want to be able to leave your work-in- progress without packing everything away.
  • Page 8 Page 8 PSU-2448mk2 Power Supply Kit Step 2. Solder all ceramic capacitors to the PCB. These are the small yellow components. Step 3. Solder the bridge rectifiers, RECT1 and RECT2. These are the small circular components that have a “chopped-off” side.
  • Page 9 Page 9 PSU-2448mk2 Power Supply Kit Step 4. Solder the (3) LEDs shown below. The LEDs are located under the fuses. The LEDs require the proper polarity for it to work. It has a (+) Terminal and a (-) Terminal. See the photo below on how to...
  • Page 10 Page 10 PSU-2448mk2 Power Supply Kit MOUNT the LEDs as close as possible to the PCB board so its height would not interfere with the fuses. Note: You may wire one of the LEDs to a front panel LED indicator lamp instead. Use the Panel-Mount LED that came with your...
  • Page 11 Page 11 PSU-2448mk2 Power Supply Kit Step 5. Solder all small electrolytic capacitors. These capacitors also have polarity markings. One side will be marked as (-). This is the Negative terminal. Install the capacitors with the negative terminal inserted at the bottom hole.
  • Page 12 Page 12 PSU-2448mk2 Power Supply Kit Step 7. Solder the medium sized, 100uf electrolytic capacitors. Step 8. Solder the tall 1000uf 50V electrolytic capacitors.
  • Page 13 Page 13 PSU-2448mk2 Power Supply Kit Step 9. Solder the 1000uf 80V capacitors. These are snap-in type capacitors. You need to do a slight twisting motion when inserting the capacitor leads into the holes. Step 10. Solder the three voltage regulators. For aesthetic reasons, keep all their height at the same level. The flat side (i.e. metal side) of the regulators should be facing out towards the top edge of the PCB.
  • Page 14 Page 14 PSU-2448mk2 Power Supply Kit Using the photo below as a guide, from LEFT to RIGHT, the regulators are LM337, LM317, LM317.
  • Page 15 Page 15 PSU-2448mk2 Power Supply Kit Step 11. Install TO-220 heatsinks to your regulators. Use small nut and bolts to fasten the heatsinks to the regulators. Note: You don’t need to install insulators. Just make sure the 3 heatsinks do not touch each other, or the metal part of your case.
  • Page 16 Page 16 PSU-2448mk2 Power Supply Kit Step 12. Install the (6) fuse clips. IMPORTANT!!! Note the proper orientation of the fuse clips. One end of the fuse clip has a “stopper”, and the other end is open. The “closed end” of the fuse clips should be mounted as shown below.The “open ends” of the fuse clips should be facing each other.
  • Page 17 Connect AC1, AC2 and CT pads of the PCB to the secondary windings of your power transformer. If you’re using the FiveFish Studios 1u PWR-TRAFO kit, wire the transformer as follows: On the secondary side, connect the RED and ORANGE together. (this will be the center-tap wire CT). The center-tap wire will connect to the CT pad on the PCB.
  • Page 18 Page 18 PSU-2448mk2 Power Supply Kit PSU-2448mk2 Voltage Adjustment Guide The voltages selected for this instruction assumes you’ll be using this PSU kit with the SC-1mk3 or X-12 preamp kit. If you’ll be using this power supply with another project, adjust the output voltage accordingly to what you need.
  • Page 19 The fix is removing the faulty voltage regulator and installing a brand new one. The desoldering of the faulty regulator is a little difficult if you don’t have the proper desoldering tool. To solve this problem, the new PSU-2448mk2 Power Supply Kit (Black face PCB) has (3) on-board fuses to protect the PSU (and your equipment) from accidental voltage shorts.
  • Page 20 Page 20 PSU-2448mk2 Power Supply Kit PHOTO 1: In normal operation, you’ll see all (3) LEDs lit up. They are positioned under the fuses so you can see them clearly. PHOTO 2: Let’s simulate a short circuit by bridging a wire between the +48V phantom power and Ground. You’ll notice the RED LED lamp for the +48V fuse is now OFF.
  • Page 21 Page 21 PSU-2448mk2 Power Supply Kit PSU-2448mk2 Parts List Part Value Notes IC1,IC2 LM317 Regulator 1.5Amp Voltage Regulator (POSITIVE) LM337 Regulator 1.5Amp Voltage Regulator (NEGATIVE) D1,D2,D3,D4,D5,D6 1N4004 Diodes RECT1, REC72 W02G bridge rectifier LED1,LED2,LED3 LITE-ON LED RED See instructions for correct orientation.
  • Page 22 Page 22 PSU-2448mk2 Power Supply Kit PSU-2448mk2 PCB Component Layout Guide...
  • Page 23 Page 23 PSU-2448mk2 Power Supply Kit PSU-2448mk2 Schematic Diagram Copyright © 2008 FiveFish Studios...