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Isolation transformer for laptop charger?

Would using an isolation transformer on a MacBook Pro power supply (charger) help to block noise going back into the same circuit which feeds my other audio equipment?  The USB output side of the same laptop goes into an ISO Regen with its own linear power supply which then feeds my DAC.  I assume the MacBook charger is a SMPS which are known to be very noisy.  I'm not an EE so hoping that this isn't a ridiculous question.
jc4659

Showing 2 responses by imhififan

imhififan's avatar
imhififan
2,108 posts
 
I assume the MacBook charger is a SMPS which are known to be very noisy.
Unplug the charger, use the internal battery of the MacBook Pro play some music and see if you can hear a different.
Maybe a LPS?
https://www.computeraudiophile.com/forums/topic/17840-linear-power-supply-for-a-macbookpro/
imhififan's avatar
imhififan
2,108 posts
 
@jc4659
Glad my suggestion helped.
if it makes a difference then all I need to do is remember to disconnect the charger when listening to digital files, and more importantly, remember to reconnect it when I’m done!
Maybe you can add a current sensing relay/switch to your system to automatically connect/disconnect the charger.
http://www.ebay.com/bhp/current-sensing-relay

Happy holidays
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