On Wed, 26 Oct 2005, keith_w wrote:
Gonz wrote:
In another group, I read about the Lenmar ACON6, which supplies 2.1A @
6.5v. The voltage is correct, the current is just shy of the 3A that the
Pentax supplies, but it seems to be just overengineered. I have used it
extensively for portraits and sensor cleaning and it works like a trooper.
It was real inexpensive too.
rg
2.1 Amps vs. 3.0 Amps is only 70% of the current rating the maker believes
the power supply should present to the load.
I don't call that "...just shy of."
Not when you're dealng with power supplies!
I didn't go so far as to put high-frequency datalogging on my
measurments of the *ist-DS current, but what I did see was WAY below 3A.
Even the spike when the flash fired and started charging again was about
1.5A. The limits on these classes of power supplies are usually thermal,
not absolute current.
Great find on that power supply... looks like a reasonable price
for a good (switching) unit.
-Cory
--
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* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
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