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

[Alistair Grant]

On Sun, Jan 4, 2015 at 11:51 PM, Mike Perkins
<mikep at randomtraveller.org.uk> wrote:
> 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.

Fair enough, I've never used a so much larger power supply, so haven't
come across this issue.

Cheers,
Alistair