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12 volt plug-in PSUs

AncientMariner
A friend has just asked me a question re 12 volt plug-in PSUs where the answer seems obvious, but then again?


His question is that as he has a multitude of 12 volt PSU's supplying numerous devices, is there any problem in using a suitably rated 12 volt PSU with a multi-way splitter cable such as those sold on eBay,  subject of course that all have the same polarity and 2.1 5.5 mm connectors?  My unsure concerns being whether there is a risk of difference voltages between exposed metal work (if any) on the connected device. Also the overall efficiency depending upon how many devices are connected.

Clive


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    It depends on whether the devices might interfere with each other, or lead to "earth loops".


    Simple example is guitar pedalboard, where the pedals can influence each other, and the DC supply might lead to loops in the ground/shield of the signal wire as it passes through the pedalboard.


    "Power supply isolators" are available - I made my own with isolated DC-DC converters, so I only need a single mains input to DC supply, which then passes through the power isolators (DC-DC converters) to power each pedal.
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  • 0
    It depends on whether the devices might interfere with each other, or lead to "earth loops".


    Simple example is guitar pedalboard, where the pedals can influence each other, and the DC supply might lead to loops in the ground/shield of the signal wire as it passes through the pedalboard.


    "Power supply isolators" are available - I made my own with isolated DC-DC converters, so I only need a single mains input to DC supply, which then passes through the power isolators (DC-DC converters) to power each pedal.
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