Electronics

Dizzy · Joined: 25 Nov 2006 Posts: 1

Hi,

I've just bought some guitar effects equipment from the US and need to substitute the original 120VAC => 9VAC adapter with a 240VAC version. (I'm in Australia)
I need 2A.

I got hold of a 240VAC=>120VAC adapter to use initially (i.e piggy-backed the original 120VAC=>9VAC adapter on it).
This was both ugly, and noisy (quiet hum)
It also got quite hot.

Since then I've got a 240VAC => 9V DC adapter (2A) and have only just realised the original 9V adapter was actually AC.

Both 9V adapters have only 2 terminals.

I made sure I had +ve polarity on the new DC adapter, and took a deep breath.

It seems the 9VDC adapter works fine.

Is there a problem running AC gear on DC ??

If someone has the time, I would greatly appreciate if you could let me know if I'm doing something fundamentally wrong or if I'm unknowingly doing damage to my gear.

Thanks heaps.

neon · Joined: 25 Feb 2006 Posts: 570

AC stand for alternating current
DC stand for direct current
ac 240v means 338v peak positive and 388v negative
continously vaying.
dc 240v means positive. -240v means 240 negative from a reference potential . you need a transformer from 240v to 120v or a ratio of 2:1 with the proper consumption in your case 9v[x] 2amps or 18 wats. times transformer loss of 20% propably 30 watts transformer will work. a converter is not the same as a transformer and probably cost more and cause you sound problems.

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