25 Jan
2012
25 Jan
'12
12:41 a.m.
On 1/24/2012 5:33 PM, David Riley wrote:
I start with the current required. If there's a minimum load current
specified, I'll start from that and go up, otherwise anywhere from
1/4 to 1/2 the maximum current specified. From there I figure out
what resistance I'll need for the voltage rail operating normally,
and then spec a resistance (sometimes multiple series or parallel
elements) which can withstand from 3-10x the power dissipation
(especially in case the supply is wildly out of spec on the
voltage).
How would you test a AC load, say for Disc Drive for example
with a power on sequence?
I have some dummy load resistors for tube amp power
supplies that are
like small ceramic paper towel rolls with wire wrapped around them
(the 8 ohm one for the speaker load is especially impressive, though
since it's fairly reactive, it's also not a great speaker load).
Come Now, all speakers I can think of is reactive.
They're rated at something like 150 watts, and I
think even that
might be with forced air through them if you're running them longer
than about a minute (which I don't).
What your ears are rated at is a better rating.
- Dave