[mythtv-users] Issues with my HDHomerun: Resource temporarily unavailable

[Mike Perkins]

On 04/01/15 19:35, Alistair Grant wrote:
> On Sun, Jan 4, 2015 at 8:24 PM, Ian Evans <dheianevans at gmail.com> wrote:
>>
>> Bowing down to those of you with more electrical knowledge, I see that the
>> JTA0302B is a 2A power supply while Silicondust says it needs a 1A. But I do
>> recall seeing people mention the JTA0302B in the 'dust forums.
>>
>> Going back to high school science I seem to remember amps are the "amount",
>> while volts are the "presuure" of the power. So what exactly happens if I
>> use 2A on something that calls for 1A?
>
> The short answer is you'll be OK (but see my assumption below).
>
> The important bits are:
>
> * The voltage matches (you haven't mentioned them here, I assume
> they're the same).
> * The maximum supply current (2A in the example above) exceeds the
> load requirement (1A in the example above).
>
> Just to add to your analogy: I normally think of a tank connected to a
> hose.  The voltage is equivalent to the height of the tank (the
> available pressure).  The current is the amount of water that can
> flow, i.e. the diameter of the hose.
>
> However, we can't take the analogy too far - assuming the voltage is
> correct and everything else is working as it should, the load will
> only draw as much current as it needs, so over spec'ing the power
> supply won't hurt.
>
Perhaps, but see my earlier note in this thread. A larger power supply may need 
to draw a certain minimum current before it will regulate properly, or at all.

2A supply serving a 1A load should be OK, I do that all the time.

-- 

Mike Perkins