9VAC plug

[Kris]

I bought a DM5 from a chap in the USA and it arrived yesterday with the USA power plug as expected. No problem there. I'm going to buy a similar plug from Dick Smith but was wondering.... the USA plug is 9VAC with 830mA. If I get a 9VAC with 1amp will that be ok? It's the voltage that matters, not the amps in this case?

Kris.

[otto ruiter]

That'll be fine.

[Kris]

Thanks Otto.

[chris p]

Yo Kris

To build on Otto's reply, the power supply amps number is a rating of the maximum current able to be delivered by the supply, rather than a statement about actual electrical current.

The supply delivers 9V, but the actual amps drawn from it depends on the circuit to which its connected (amps = volts/resistance). What the amp rating tells you is that you should not connect it to a circuit that will draw more than 1 amp, or else you'll blow your supply (very quickly, in my experience!).

I tend to favour (within reason) an overengineered power supply anyway - look at how many computer power supplies die becuase they run their tolerances too close to the wire. So in my book, you've actually done the right thing in getting a 12% higher rated supply.

[Kris]

Thanks Chris.

So now I need to locate a 240VAC to 9VAC power adaptor at 1amp.

Anyone know where I can get these? Dick Smith and Jaycar are both coming up blank. Plenty of DC adaptors though.

[chris p]

An AC supply is better known to you and me as a transformer.

Something like
http://www.altronics.com.au/index.asp?a ... &id=M2165L

Just stick it in a box with a (say) 200 - 500mA fuse inline on the primaries.

Good luck

[Ausrock]

Kris,

Try Jaycar part # MP-3027. 240V to 9VAC 1 amp plug pack.

ChrisO