These are subtle odours, but having a sensitive nose myself, I know where you're coming from.
There is a very faint plasticky-electric scent to a charged laptop. Or then again, there's definitely a 'new camera' smell when you first crack the box, so some of the regular upgraders out there must be familiar with/addicted to that one.
The hardware doesn't offer much in the way of oflatory experience. It's travel that really sets the senses alight: to find yourself in a strange land full of alien whiffs, some welcome, others less so. Who can forget the smell of palm oil frying in a Thai street market? Or the musky blend of burning coconut husks, incense and frangipane in a Balinese temple? There are places like Port Sudan that reek of urine and marine diesel, or there's the melange of vegetation that you get on tropical islands from the Maldives to Fiji.
At the end of the day, you can't beat the frying bacon at Stoney Cove.