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Rather than buying or building a smaller power supply, just use the big console PSU and build a set of current limiters to place in line with each voltage rail. Build it into a box with a connector for the PSU's umbilical on the back and the module connector(s) on the front. Probably put some audio connectors on it as well for easy connection to your test equipment. Current limiters/regulators are easy to build and use very few components. Could be done on perf board or other prototyping boards with a minimal effort.
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