[Noisebridge-discuss] How close do I need to get with amperage?

[Jake]

as it turns out, the most important point got overlooked - polarity.

Rachel didn't know whether power connectors go straight or... the Other 
way, and in fact the power adaptor in question had the opposite polarity 
of the appliance being powered.

the diagrams must match, or multimeter games must ensue to find out 
whether things are wired the same way.  If you have an adaptor with a 
connector that fits, but the polarity is backwards (the little diagram 
with + and -) you could fry your device if you just "try it".

if you have the right adaptor except for the polarity, you can cut the 
cable and swap the wires with each other, and tape it back up, but make 
sure to label the cable so nobody believes the diagram on the original 
nameplate anymore since you've reversed it.

you missed our x-ray presentation at 5mof, i thought you were all excited 
about xrays.  Now we need a long-exposure camera (noisebridge DSLR?) for 
taking more and more xray pictures.

-jake

John Withers wrote:

Rachel,

This isn't an issue. A device will draw what it needs. And even if you
had a very, very badly engineered device that somehow would draw enough
to blow it, the difference there is trivial and wouldn't hurt anything
anyway.

As long as the voltage matches you are fine.

j

On Thu, 2012-12-20 at 19:32 -0500, rachel lyra hospodar wrote:
> I have a piece of audio gear (roland micro cube) that requires 9v &
> 185 mA .  I scored a power supply that supplies 200 mA but am
> wondering if it's safe to use or if it might fry the amp?
>
> R.