Quick Power Supply Question

[Dean]

Just requiring a confirmation on this from anyone in the know.

I have a small electrical unit from the USA (not woodworking related) that has a power input stating it requires "9vDC 300mA".

I have an aussie power supply (one of those multi-voltage ones from Dick Smith) that says it delivers 600mA at 9v setting. I am assuming this will work ok for my U.S. electrical device. mA is basically the max current draw available isn't it? So if unit only needs 300mA, it will only draw 300 from the power supply correct?

Thanks.

[echnidna]

yes

[Dean]

awesome thanks

[Termite]

Bugger, An eight minute instant fix, we didnt even get a chance for a hijack or a fight.

[echnidna]

sorry but that

[Dean]

Lol

[Wood Borer]

You should be OK unless in the unlikely event the device requires a regulated and filtered power supply. Usually the regulation and filtering is done in devices using Plug Packs.

Make sure the polarity is correct too Dean, again often there is protection in the appliance against wrong polarity but check anyway.

[Dean]

You should be OK unless in the unlikely event the device requires a regulated and filtered power supply. Usually the regulation and filtering is done in devices using Plug Packs.

Make sure the polarity is correct too Dean, again often there is protection in the appliance against wrong polarity but check anyway.

Speak english

[Ivan in Oz]

What WB might be saying is that there could be a 100Hz ripple on the DC Output
where the Septics are used to a 120Hz ripple..... ......:eek: ......

[echnidna]

You need to hook the postive wires together and the negative wires together not positive to negative or you will let all the smoke out!

[Wood Borer]

Sorry mate, time to go home.

Polarity - make sure the positive and negative are on the correct pins.

Regulation - most plug packs have a higher voltage than the nominated voltage when there is no load applied. When a typical load is applied in your case 300 mA then the voltage will drop to around 9 Volts.

A regulated plug pack will have a terminal voltage of 9V no matter what load you are drawing (within limits of course).

No real threat of me taking over your great reviews in AWR eh Well done, I'll read your latest review tonight in the shed. I finished reading Zed's article at 1AM this morning.

[Dean]

the finer technicalities of electrical supply have never been my strong point, but thanks for the info

[outback]

Electricity is dangerous. Get an electrician to do all this for you. Never attempt to do anything without consulting a fully overpaid professional.


Let the smoke out, thats funny.

[Dean]

Never attempt to do anything without consulting a fully overpaid professional.

LOL

[Dean]

Actually I just found out it also takes 6xAA batteries as an alternative