On 15 Feb 2001, at 7:42, Colin & Linda McKie wrote:
> John Francis wrote:
>
> > There's even an example from the Pentax lineup - to get the full
> > speed from my Motor Drive MX I have to use the Battery Grip M -
> > using the rechargeable NiCad battery (if I owned one) limits me
> > to 3.5 fps, not the 5 I get using AA batteries (12 of them!).
> >
>
> Wire up 15 AA NiCads in a box and keep it in your pocket. I used a 12 x
> NiCad setup like this when I was using my Motor Drive MX a lot. The AAs
> will deliver a lot more current than the button cells and this is
> probably where a lot of the increased speed comes from.
The Ni-Cd cells have a far higher maximum short circuit current (ie very low
internal resistance[IR]) however as there are only 12 at a nominal 1.25v in the
pack the terminal voltage is down by 3v over a set of 12 x AA alkaline cells.
The drive sure would whir with 15 AA Ni-Cds however if you were going hard
at it all day I suspect that the motor would eventually cook with the
increased supply voltage (with very high current available).
Cheers,
Rob Studdert
HURSTVILLE AUSTRALIA
Tel +61-2-9554-4110
Fax +61-2-9554-9259
UTC(GMT) +10 Hours
[EMAIL PROTECTED]
http://www.ozemail.com.au/~distudio/publications.html
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