[sdiy] Signals leaking into the PSU?

[Mike Bryant]

> It causes all sorts of fun when Class-2 appliances meet Class-1
appliances in larger setups.  For instance connecting a class-2 laptop
or DVD player to a Class-1 (earthed) TV results in some tiny but pretty
impressive sparks between the audio/video connectors when they come
together.  It also hurts if you do this connection with the power on and
manage to get your finger across the gap! (>.<)

And again, tell me about it.  I was engineering director at an audio mixer company around the time people started connecting more and more powered equipment to the mixer without a DI box, which we sort of encouraged by offering higher headroom mic amps and adding SPDIF ports into and out of the main mix.  Support used to get daily phone calls from people saying our equipment must be faulty, when of course it was the class 2 item generating the sparks into our nicely grounded equipment.
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