[SPARCbook] buzzing noise from ac power supply

[Hugo.van.der.Kooij at caiw.nl]

On Wed, 29 Dec 1999, nm wrote:

> I recently bought something called a "power jump".  This is
> a little box that plugs into a car's cigarette lighter and has
> has one 110v AC outlet on it (like in a house).  Anyway I can
> plug the ac power supply that came with my sparcbook 3gs into
> this 'magic box' and everything works as expected.  The only
> thing that is strange is that the ac power supply (the thing
> that came with the sb3) makes an audible buzz or hum noise.
> It does not make this noise when plugged into an outlet in a
> house.  Is the ac powersupply being damaged?  Will this shorten
> its life?  Any ideas or similar experiences?

Sounds like the generated 110V is not clean. A clean 110V AC should be a
pure sinuswave. However a lot of these convertors make a sort of
triangular shaped wave. They work well for lightbulbs but I wouldn't trust
it with anything more complex.

Hugo.

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