Oakley Rack Power Supply Unit – RPSU
Constructional difficulty: Easy
A completed RPSU board fitted into an
Oakley SRE330 rack ensemble module – the optional power on LED
parts have not been fitted here.
The Oakley Rack Power Supply Unit (RPSU) is
a split rail power supply design that has been designed to power
our rack module projects. It will supply a well regulated +/-15V
although it can be simply altered to supply any split rail
voltage from 5V to 20V. The amount of current that the unit can
deliver is dependant on the AC power source, the choice of
smoothing capacitors and the heatsink used. It is expected that
the RPSU be fitted into a metal case and the case used as a
heatsink for the two power devices.
For safety reasons it is suggested that the
unit will be used with an external single phase wall-wart (plug
top adapter) or centre-tapped linelump (in line mains adapter)
such as the Yamaha PA-20. This ensures that all high and
dangerous voltages are kept out of your module’s enclosure.
It is possible to use a standard
transformer with the RPSU. But note, a component level mains
transformer should only be used if you know how to connect high
voltage wiring. On no account should this project be powered by a
component level mains transformer if you are not familiar with
fusing, earthing and safe connection of high voltage equipment.
For safety reasons Oakley Sound can only endorse using this
module with a low voltage input from a suitable plug top or
inline power supply.
The power supply uses standard
parts throughout and requires only a simple voltmeter to test.
The circuit board takes less than an hour to build.
Various options are available
for different types of switching, earthing and power on
indication. The strong glass fibre PCB is silkscreened for easy
component identification. It uses generous pad sizes, through
plated holes for easy soldering and wide double sided copper
tracks for reliable operation.
The unit features two 0.156″
headers for the outputs. PS1 can be either four (or five) way and
carries +15V, 0V, 0V, -15V, (ground). PS2 is a three way header
and carries +15V, 0V, 0V. PS1 when fitted with a four way header
is MOTM compatible.
The board size
is 150mm (width) x 50mm (depth).
Prices
RPSU issue 2.1 PCB
……………………………………………. 12GBP
3-pin power socket for external PSU
……………………… 2.50GBP
All of the other parts should be able to be
purchased from you usual electronic component supplier. Please
see the Builder’s Guide for more details.
See the Oakley Sound ordering
page for ordering information, shipping charges and payment
methods.
All prices include VAT at UK rates.
Shipping/postage is additional to these prices. See also the FAQ page.
The three pin power socket for use with
external PA-20 and PA-30 power supplies.
Downloads
Construction
Guide Our handy guide to building
Oakley DIY projects
Parts
Guide Our handy guide to buying
parts for Oakley DIY projects.
Use ‘save as…’ button to
download and view the files.
The schematic is provided only
to purchasers of the printed circuit board. This will be sent to
you as a PDF file with your shipping confirmation e-mail.
For technical support on all Oakley
projects please refer to the knowledgeable and helpful Oakley Sound Forum
which is hosted at ModWiggler.com. Tony
Allgood does not provide official building support for Oakley
projects, but he and many others are usually available for help
via the forum.
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