*?*
Hmm. I do not recall, but I'm betting that the supply was tied to the
battery terminals, otherwise I would have had to make up a pigtail to use the
jack. I wouldn't bet my life on that...
As an aside, I attach here a plot of battery voltage vs. time. This was
recorded using fully charged 2400mA NiMH batteries. Cutoff occured at 1407
minutes. Note the abrupt knee at the end of the useful battery charge/energy.
That is characteristic of NiMH batteries. Alkalines have a more gradual slope
John W.
----- Original Message -----
From: Josh Malone
To: Model 100 Discussion
Sent: Tuesday, December 08, 2015 6:14 PM
Subject: Re: [M100] M100 power requirements
Awesome, thank you. Any idea if this was measured with supply connected to
the dc jack or the battery terminals?
On Dec 8, 2015 5:53 PM, "John Whitton" <jwhit...@bellsouth.net> wrote:
FWIW, find attached a .pdf graph of M102 power consumption. This was
compiled 6 years ago (hard to believe).
John W.
----- Original Message -----
From: Josh Malone
To: Model 100 Discussion
Sent: Tuesday, December 08, 2015 4:02 PM
Subject: Re: [M100] USB "juice pack"
I just tested the power requirements of my 102. With the battery
connectors connected to a bench supply at 5 volts, it draws a very consistent
65mA. I was expecting the current to vary slightly with CPU or screen activity
but it does not. I'm so used to CPU idle states which, of course, the 8085 does
not use :)
I have one of these kicking around at home
(https://www.sparkfun.com/products/10968) so I'm thinking to construct a
LiPo-based AA battery replacement so I can recharge my 102 via USB. There's
also https://www.sparkfun.com/products/11231 but that's capable of WAY more
current than necessary and considerably more expensive.
-Josh
On Thu, Dec 3, 2015 at 7:00 PM, Mike Stein <mhs.st...@gmail.com> wrote:
Yeah, I was wondering about that, especially with WiFi; definitely
sounds a little high. Too bad.
Maybe Jeff's solution isn't such a bad idea after all ;-)
Anyway, the M100 works fine on a "juice pack".
m
battery.pdf
Description: Adobe PDF document
