The Power Supply must provide 9V AC or DC at 600mA Minimum to 1Amp Maximum.
(The Power Supply for Units Supplied Before December 2004 can be 500mA Minimum.)
It must meet local safety standards, be short circuit protected and ideally regulated if DC.
It must be fully isolated and not used to power anything else at the same time as the ACE.
It should have a standard 2.1mm * 5.5mm * 12mm plug. Power polarity is not important.
For those wishing to use existing supplies it should be noted in addition to the above that Supply Voltage must also be limited to an actual on load maximum value of 10V AC or 12V DC. Since unregulated supplies often give out higher voltages than specified this means in practice that AC transformer ratings should not exceed 9V AC and unregulated DC supplies should not exceed a rating of 10V DC. Supplies rated at up to 12V DC can be used ONLY if the supply is regulated OR if the supply has a continuous current rating of no more than 600mA.
Please note that the 12V maximum DC supply rating does not allow for direct connection to a 12V vehicle battery as these are charged to around 14.4V. Vehicle applications require the use of a fully isolated supply regulator meeting the above maximum voltage and current requirements.
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