Hi.
Without further knowledge of your slave device and how it interact with your amplifier, it's very hard if not impossible to lay any solution down on the table.
Oh, very well. I'm sorry I cant' help you furter on. However it seems that other forum member know about this more than I do.Without you giving me a hint as to what additional information I need to give you, it's very hard from me to give you that information :wink:
Perhaps I am wrong, it seems to me that when you supply your controller from the amplifier you use the ground of the RS485 as the negative return. If this is the case you need to take the two supply wires (+5V and ground) from points as close as possible to the regulator output terminals (on the HiFi board) so that the controller current will not pass in any PCB tracks of the HiFi amplifier.
However it seems that other forum member know about this more than I do.
Good luck
... this is important to me because I have to build my circuits using 1-layer PCB.
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