FiveFish Studios PSU-2448mk2 Manual de usuario
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.
PSU-2448mk2 Power Supply Kit
Copyright ©2010 FiveFish Studios
www.fivefishstudios.com
Last Update: 7/08/10
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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” inch tall.
The Printed Circuit Board is professionally manufactured, with double-sided copper, plated-through holes, and top silkscreen
component labels.
This Power Supply is designed to work with the SC-1, SC-1mk3, X-12 Mic Preamp Kit, or any other opamp/preamp project
requiring a split power supply.
Each voltage rail output is continuously adjustable via it’s own trimmer. The V+ and V- outputs can be adjusted for +/-15,
+/-16, +/-18, +/-24V projects…. Or any voltage you want.
The 48V DC output, used for phantom powering, can be finely adjusted to give you exactly 48 Volts to power your condenser
microphones.
Each voltage rail is protected with it’s own fast-acting fuse to protect the power supply and your preamp from any accidental
power shorts.
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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.
If you are using a di!erent brand/model of transformer, please consult the manufacturer for their documentation.
110 VOLT OPERATION
For 110V operation, we need to connect the primaries in parallel.
Connect the BLUE and VIOLET wires together.
Connect the GRAY and BROWN wires together.
Connect both across the 110V line.
Secondary Wiring
On the secondary side, we need to 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.
Connect the BLACK wire to AC1 on PSU PCB.
Connect the YELLOW wire to AC2 on PSU PCB.
220 VOLT OPERATION
For 220V operation, we need to connect the 2 primaries in series.
Connect the GRAY and VIOLET wires together.
220V is applied across the BLUE and BROWN wires.
Secondary Wiring
On the secondary side, we need to 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.
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PSU-2448mk2 Power Supply Kit
Connect the BLACK wire to AC1 on PSU PCB.
Connect the YELLOW wire to AC2 on PSU PCB.
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PSU-2448mk2 Power Supply Kit
Basic Tools Required
A few basic tools are required to build this kit.
1. 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. They are overkill for this project and you may damage the small parts.
!
2. Mini Pliers Cutter – to cut component leads, wires, strip insulation o"wires (if you don’t have a wire-stripper tool).
3. Mini Long Nose Pliers – to bend component leads, use as a heatsink, hold components, tighten bolts.
4. Manual Solder sucker pump – sucks up solder when you made a mistake soldering components on the PCB. Primitive
operation, but it works… kind of.
5. Multitester – A simple meter/tester to measure resistance, and voltages. A digital read-out is a big help.
6. Soldering Lead – 60/40 lead or lead-free solder.
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PSU-2448mk2 Power Supply Kit
7. Magnifying glass – to see what you’re doing!
8. 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.
Extra Tools (Nice to have, but not required)
1. Vacuum desoldering pump – if you make a mistake, you need to pull out the component from the PCB
2. Component lead bender – bend component leads like resistors uniformly and evenly
3. PanaVise – to hold PCB while you’re working on it
4. Tweezers – to pick tiny things
5. Masking tape – to hold components on the PCB while working
6. Wire-stripper – for cutting wires and stripping its insulation
PSU-2448mk2 Assembly Guide
Step 1. Solder all resistors and diodes to the PCB. Each resistor value is marked in it’s own zip lock bag.
IMPORTANT: The white band of all diodes are oriented on top. Make sure you do not reverse this.
TIP: If you want to learn how to read resistor color codes, visit our website at http://fivefishstudios.com/index.php/Resistor-
Color-Code-E96-1.html
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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-o"” side.
Note the proper orientation. Follow the guide printed on the PCB.
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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
mount the LED correctly. Note the “Short Leg” and “Long Leg” of the LED and insert it in the orientation shown below.
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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
1u Power-Transformer Kit.
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