Nigel Goodwin said:As Sebi has already mentioned, microwave ovens generally use what is known as 'burst fire' power control. They usually use a 10 second timing period, so for half power they turn on for 5 seconds, then off for 5 seconds. It's a method of power control commonly used for heating - obviously not very good for dimming lights though :lol:
I have seen occasional very old microwaves, with just two powers (full and defrost) where they switch a different value capacitor in to circuit for the lower power - but these are pretty uncommon.
Noggin said:I recently purchased a Panasonic microwave that claims to have a true variable power mode, and I havn't heard it switching on and off periodically when on different power settings. I havn't paid a whole lot of attention to it though, but the first couple times I ran it I did listen for a few seconds to hear the mag turn off.
coyotesden said:I've done this flouresent trick thing too test microwaves,....But someone in this topic, refered to a magnatron as a tube :roll:,.... Back in the 40's and 50's, they used what were called Klystron tubes for radar, Prety much what microwave energy is..However a megnetron is a metal box looking thing with a megnet surounding the wave guide.
coyotesden said::shock: Ouch! I knew a realy stupid 'tech, he would put his arm in a microwave oven, after bypassing the saftey locks to see if the magnetron worked,...I guess he didn't know the light bulb trick :shock: :roll: BTW true story!!