FiveFish Audio PSU-2448Plus+ User manual

FiveFish
Studios
PSU-2448Plus+
Assembly Guide
Copyright © 2015-2017 FiveFish Audio

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 PSU-2448Plus+ Power Supply Kit.
Copyright © 2015-2017 FiveFish Audio
veshaudio.com
Revision 1.02 - 20171105

Dear Customer,
ank you for purchasing our PSU-2448Plus+ Power Supply 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 power supply.
is 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.veshaudio.com, or via our facebook page.
Sincerely,
FiveFish Team
FiveFish
Studios
FiveFish Audio www.veshaudio.com

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
SAFETY CONSIDERATIONS
GENERAL
This assembly guide must be reviewed for familiarization
with safety markings and instructions before assembly of
the power supply kit.
BEFORE APPLYING POWER
Verify that all components and parts are inserted in
the right location and correct orientation. Verify that
the power transformer wiring is congured correctly to
match the available AC line voltage in your country, i.e.
wired correctly for either 110Volt or 220Volt operation.
SAFETY EARTH GROUND
An uninterruptible safety earth ground must be provided
from the AC power source to your power transformer.
The WARNING sign denotes a hazard. Pay attention
to the procedure, instructions, or the like, which if not
correctly performed could result in damage to your
equipment, electronic component or personal injury.
Any interruption or disconnection, or lack of connection of
the protective earth terminal/safety ground may cause a
potential electric shock hazard that could result in personal
injury. (Grounding one conductor of a two conductor outlet
is not sufcient protection). Connect the safety ground of
your AC wall outlet to the metal case of your power supply
enclosure.
Some voltage adjustments described in this assembly
guide require power to be applied to the power supply
unit.
Capacitors on the power supply board may still be charged
even if the unit has been disconnected completely from it’s
source of power, i.e. unplugged from the wall, or switched
off.
Properly drain the capacitor charge using a bleed resistor
of sufcient power wattage and measure with a voltmeter/
multimeter to verify that no high voltages are present after
disconnection from the main power source.
For continued protection against re hazard, replace the
fuse(s) with proper rating applicable for your chosen
power transformer VA rating. Do not use repaired fuses
or short-circuit the fuseholder with a wire to bypass the
fuse.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
GENERAL INFORMATION
1. DESCRIPTION
PSU-2448Plus+ Power Supply Kit is a four (4) rail power supply system designed to output a regulated and adjustable (+)
positive, (-) negative, +48Volt, and an extra (+) xed voltage output rail. It has a low-prole footprint, designed specically to t
inside a 1u standard rack height.
The Printed Circuit Board is professionally manufactured, with double-sided copper layers, plated-through holes, solder mask,
and silkscreen labels.
This Power Supply is designed to work with the FiveFish SC-1, X-12 Mic Preamp Kits, or any third-party preamp or opamp-
based project requiring a dual split +/- power supply.
The three (3) voltage rails (V+, V-, +48V) are easily adjustable using onboard trimmers. The V+ and V- outputs can be adjusted
for +/-15, +/-16, +/-18, or +/-24V projects…. or any other voltage you need.
The +48Volt DC output, used for phantom powering, can be nely adjusted to give you exactly 48 Volts.
A fourth voltage output is also available for powering auxilliary circuits. It’s up to the end-user to select what voltage they want
for this auxilliary output. The fourth voltage output can output either +5V, +12V, +15V or +18V, depending on the specic voltage
regulator used for this section. (The only requirement is Vaux < V+ output.)
All voltage rails feature built-in current-limiting and short circuit protection provided by the 3-terminal regulator devices. The
V+, V- and +48V voltage rails are additionally protected by in-line fuses against any accidental power supply short-circuit or
overload/overcurrent condition.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
A POWER TRANSFORMER IS REQUIRED FOR PROPER OPERATION
DO NOT CONNECT THE PSU-2448PLUS+ KIT DIRECTLY TO AC MAIN LINES
The instructions on this page are for the FiveFish Audio PWR-TRAFO kit. If you are using a different power transformer
brand or model/part#, please consult your power transformer’s manufacturer’s documentation.
110Volt Wiring Guide 220Volt Wiring Guide

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
2. TOOLS & EQUIPMENT REQUIRED
A few basic tools and equipment are required to assemble this kit. These basic tools are not supplied
with the kit.
2.1. Soldering Iron and Lead - We recommend a temperature adjustable soldering iron. DO NOT
USE A 100 WATT SOLDERING GUN. A small 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 need to desolder a component, you’ll need one.
2.4. Multitester - Used for measuring resistance, continuity, and voltages.
2.5. Magnier & 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.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
3. ASSEMBLY GUIDE
3.1 Solder all resistors and diodes.
Insert diodes in the correct orientation. Align the white band of diode with silkscreen on the PCB.
GENERAL INSTRUCTIONS: Open zip bag, insert component into board, solder.
All components are labeled in their own zip bags. There may be multiple components stored in each zip bag, with
their quantity noted. The voltage regulator part numbers (LM317, LM337) are marked on the device. Make sure to
insert each regulator into it’s correct location.
TIP: Solder smallest/shortest components rst before the larger/taller components to make assembly work easier.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
3.2 Solder all ceramic capacitors. These are the small yellow components.
3.3 Solder Bridge Rectiers.
The Bridge Rectiers may be damaged if you apply too much heat for a long period of time.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
3.4 Solder the (3) Light Emitting Diodes (LED).
LEDs, like diodes, have polarity and must be inserted in the proper orientation. See additional
photos below for correct orientation.
Mount the LEDs as low as possible on the PCB so
it wouldn’t interfere when the fuses are installed.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
Electrolytic capacitors have polarity markings. One side is marked (-) negative, and the other side
is (+) positive. Insert the capacitors to the PCB following the correct polarity. NOTE: All capacitors
in the PSU kit are oriented in the same direction.
3.5 Solder all small electrolytic capacitors.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
3.6 Solder all trimmer resistors. Trimmer resistors are used to adjust the nal output voltages of the Power Supply Unit.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
Electrolytic capacitors have polarity markings. One side is marked (-) negative, and the other side
is (+) positive. Insert the capacitors to the PCB following the correct polarity. NOTE: All capacitors
in the PSU kit are oriented in the same direction.
3.7 Solder all medium-sized electrolytic capacitors, then all large-sized electrolytic capacitors.
NOTE: The 1000uf/80V capacitors are twist-in type. Push them into the board with a rotating motion.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
3.8 Solder the voltage regulators. The at-side/metal-side of the voltage regulator should be facing towards the
edge of the PCB.
For V+, and +48V section: Use the LM317HVT voltage regulator.
For V- section: Use the LM337 voltage regulator.
For the Vaux section: You may use any of the following -- 7805, 7812, 7815, or 7818 voltage
regulators for +5V, +12V, +15V, +18Volts respectively.
DO NOT INTERCHANGE THE POSITION OF THE VOLTAGE REGULATORS OR YOU
MAY DAMAGE THEM.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
NOTE: If you use the provided heatsinks, there is no need to use TO-220 MICA or SIL-PAD insulators.
If you need to operate this power supply at higher current, or experiencing high temperatures, you may need bigger heatsinks
than the ones provided in the kit. Please read note below:
If you want to use a single or common heatsink for all voltage regulators (for example: metal chassis case, or a
big aluminum n-type heatsink, you need to use MICA or SIL-PAD insulators and check that the regulator tab is
electrically isolated from your aluminum or metal heatsink. Failure to electrically isolate the metal tab from
your common heatsink will result in a short-circuit and damage to your voltage regulators.
3.9 Attach the provided heatsinks to the voltage regulators.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
NOTE: The fuses are provided for short-circuit and overload protection. If an accidental short-circuit occured, the fuse will blow
“open” before any permanent damage is done to the voltage regulators. While the regulators have built-in short-circuit protection,
we think the fuses offer additional protection and will be much more convenient for the end-user to replace than a damage voltage
regulator.
3.10 Solder the (6) fuse clips. After soldering the fuse clips, insert the (3) fuses into the fuse holders.
NOTE: Observe the proper orientation of the fuse clip. One side has a “stopper” and the other side
is completely open. The “stopper” side should be positioned at the outside edges (so the glass fuse
cartridge can be inserted properly).

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
4. WIRING GUIDE
4.1 AC Input (from Power Transformer Secondary)
Connect the Power Supply Board to the power transformer secondary windings. Use the following wiring guide. Colors
refer to the transformer secondary winding wire colors.
NOTE: Red and Orange wires are connected together at the PSU Board. You can interchange the Yellow/Black wire
locations, since we’re dealing with AC voltages and there is no polarity.
The PSU kit uses standard 0.1” pitch pads for all
input and output connections. You can use standard
0.1” Molex headers to make connections.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
4.2 DC Output
There are (2) power ports available on the PSU board. They are identical and the same.
Vaux+ output can be congured by using the appropriate voltage regulator part# for IC4 location.
+ 5V -- 7805 Voltage Regulator in IC4 location
+12V -- 7812 Voltage Regulator in IC4 location
+15V -- 7815 Voltage Regulator in IC4 location
+18V -- 7818 Voltage Regulator in IC4 location

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
4.3 Panel LED
For your convenience, solder pads are provided for wiring to a Panel LED to indicate Power ON. You may replace the
resistor behind the LED headers if you need more/less current for your chosen LED indicator. The supply voltage is 48V.
Compute for the appropriate value of R using the formula R = V x I ; where I is the current required for LED illumination.

Copyright © 2017 FiveFish AudioPSU-2448Plus+ Assembly Guide
4.4 Power Transformer Primary / High Voltage AC Wiring Guide
If you are not comfortable following this step, please hire a professional electrician to complete this section.
You will be working with high-voltage AC mains line. Depending on your location, this may be 110Volts or
220Volts. These voltages can seriously injure or kill and I strongly suggest following all safety precautions.
AC INPUT
FUSE HOLDER
SAFETY
GROUND
POWER TRANSFORMER
VIOLET
BLUE
GRAY
BROWN
110 VOLT WIRING GUIDE
POWER SWITCH
For 220V Wiring Guide, refer to page 6 of this assembly guide.
Table of contents