You will want to keep the same voltages
The audio supplies would be two 18 volt linear power supplies having a higher current rating than 6.3 Amps. The "+" plus and "-" minus polarities are accomplished by wiring the two supplies in series like batteries. So you would have +18 volts on one end where the free positive terminal is, zero volts would be where the two supplies meet (where the minus of one supply meets the plus of the other supply) and the -18 volts would be at the other end at the free negative terminal.
the +48 volt supply can be 1 or 2 Amps and that is probably overkill. If, on a 48 input console, you SHORTED all the pins of all the mic inputs (1 to 2 to 3) the drain on the 48 volt supply would be less than 3/4 amp.
I generally use "Gold Box A series" single output power supplies made by Acopian. It is always advisable to order them with terminal covers and over voltage protection and, for added protection, one could add a beefy double pole relay in series with the outputs of the plus/minus audio supplies which would be controlled by a circuit that holds the relay closed and passing power only when both supplies are on. You need a delay in that circuit so both supplies can come up and stabilize first.
You could also use the ajustment pot to drop the voltages down to 17.5 volts. 18 volts is general the maximum rated volatge for IC's used for audio - some are 15 volts so you should always look at the data sheet.
Open frame power supplies from Power One are a a good choice if you can mount them into a chassis where all the dangerous voltages are covered.
an 8, 10 or 12 Amp supply should give you enough though is depends a bit on how many IC you change out and what current they draw as compared to the original parts.
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Topic: PSU. Which one? (Read 1450 times)