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The Oakley Power Supply Board
The issue 1 PSU2 board from Oakley Sound Systems.
The power supply board will allow the conversion of a suitable low voltage alternating current
(AC) to be rectified, smoothed and regulated for operation with the Oakley Modular. The
module is designed to be fitted to a suitably large metal panel which functions as a heatsink for
the regulator ICs. This metal panel should have adequate airflow around it. The recommended
method is to use a 4U or 5U high 19" rack blank panel. These are particularly suitable if you
are mounting your modular synth in a 19" rack. The large surface area on a 19" blank panel
allows you to mount not only the power supply module but also any Dizzy or MU-Dizzy
PCBs used for power distribution. And the large surface area also allows the power supply's
regulators to dissipate heat safely.
The voltage output of the power supply module is a split rail or bipolar 15V supply. This
means it generates both +15V and -15V. That is, two power rails, one of a positive voltage,
the other a negative one. It's sometimes written as +/-15V. These voltages are measured with
respect to a common 0V (typically called 'ground') which is normally connected, via your
house's wiring, to the earth that you stand on. The voltage across both rails is 30V, with the
common ground sitting exactly in the middle of this at 0V. Both output voltages can be finely
adjusted with their own trimmers.
The output current capability is the maximum current you can draw out of the power supply.
The current taken from the supply is, for the most part, determined by the amount and type of
modules you are connecting to the power supply. However, the actual patch also has an effect
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