I'm not an engineer, but I build custom audio equipment and systems as a hobby. My question to you is: from a computer power supply (PSU) which converts AC power into DC of various voltages (12 V-5 V) would it be possible to power a Bluetooth receiver which uses 5 V 1 A power from a wall plug USB socket, directly from the PSU? I've tried using the red (5 V) wire with the ground to a female USB cable which I plug into the Bluetooth receiver, but to no avail. The part I don't know about is the 1 A. What is the relevance of this?
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I did a quick google search on current rating on a 5V supply on a ATX power supply here is data.
Base on this data your 550W power supply should be able to source sufficient current to power the Bluetooth receiver. Your problem might not be power rating but how you are using the PSU.
As I understand ATX power supplies have a PS_ON which needs to be pulled down to switch on the PSU. When you pull down the PS_On the PWR_OK signal line goes high. After this point you can source current from the other supply lines. The a power supply is connected to the mains the 5VSB is hot. You might be able to power your device using the 5VSB source too. This is the purple wire, you might want check with a multi meter to verify.
Below is the power sequencing diagram for a PSU.
Below are some notes about PS_ON and PWR_OK
Below is the connector pin out that might be of helpful to you.
Below are few references with more insight that might be of assistance to you.
HTH
References:
Mahendra Gunawardena
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