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arunb said:The device will contain a 230V/18 V AC step down transformer. The voltage will be rectifed and regulated to 5 V DC using a 7805 regulator IC.
thanks
ar
philba said:this issue isn't completely about what is being controlled. There are many sources of ESD (or worse). The farther the device is from the computer, the more likely something nasty will find it's way down the wire. Just walking around on a low humidity day can build up a huge static charge. use isolation as a mater of good, defensive design.
ericgibbs said:hi,
I am more concerned about the OP's personal safety, regarding operating mains powered devices from the port.
...
Regards
philba said:I can't disagree but thought the discussion was about the need for isolation. While isolation may provide some protection to a user, it's main purpose is to prevent damage to electronic devices. GFIs, fuses, breakers and proper wiring are more important for life safety.