what domestic products produce an emp?

Answer 1

Anything which uses an electromagnet or any circuit which causes rapid current fluxuations. A common DC relay when de-energized will generate a voltage spike as the collapsing magnetic field cuts across the coil windings. The spkie can be large enough to damage sensitive electronic components especially CMOS integrated circuits. To reduce and prevent these spikes many circuit designs use a diode across the coil which provides a short circuit path for the voltage spike.

Voltage spikes can be generated by one piece of equipment and effect a different piece of equipment especially if the circuit is not designed to handle electrical noise.

Some sources of electrical noise: Most of which will easily travel on the 120VAC lines in a home

Motors with brushes
Light Dimmers (especialy cheap ones)
Relays
Transformers (upon sudden power loss and or cycling power on/off rapidly)
Switching Power supplies (like laptop battery chargers)

Answer 2

I guess you could get an electromagnetic pulse out of a Microwave oven.. the magnetron does produce a very mild one. the link below may be more fiction than fact.. but.. it might be of some interest..