Wondering if anyone recalls or can point to the small modification needed
to be able to use NiMH or NiCd batts in the M100, and enable charging?
Seems to me there was a nice little change you could make.
thx
Steve
thanks Bert,
I found another document (M100SIG) that suggested the components to add
were a 10 ohm resistor and a silicon diode.
Interesting.
All hacks place a circuit between the orange and red leads.
Option 1: 47 ohm
- works, but does not prevent reverse conduction from batteries to an
No worries Steve,
I didn't dig too deep into my search results but this email references
an old issue of Portable-100... so it's certainly likely that there is
more recent information out there. I'd say to use whatever solution
you're most comfortable with :-)
Cheers,Bert
On 11/23/20 3:18
On 11/23/20 1:08 PM, Jim Anderson wrote:
>> -Original Message-
>> One of our list members (David Grissom) has been able to show that there
>> was a problem created in the M100 file directory when switching in and
>> out of CP/M. To do so took a fair amount of effort so thanks David.
>
>
Hi Steve,
Email from 2010... :-)
Hope this helps.
Cheers,Bert
From: Frederick Whitaker
To: m...@list.30below.com
Date: Sun, 03 Jan 2010 08:15:53 -0500
Subject: Re: Recharging Circuit!
Thank you for finding that error, I didn't see it when I did the proof
reading. Anyone who wants to
even more whacky,
* the bug seems to exist only in M100, not T102. (different roms)
* VirtualT did not show the bug occurring unless you are in M100 mode, with
stock ROM, and you are running at 2.5 MHz.
As soon as you can make virtualT show the error, then you are golden...
On Mon, Nov 23, 2020
> -Original Message-
> One of our list members (David Grissom) has been able to show that there
> was a problem created in the M100 file directory when switching in and
> out of CP/M. To do so took a fair amount of effort so thanks David.
Wacky - I've had a couple of corruption issues
Steve,
It might be worth looking at the 8201 charging circuit since it's a similar
platform. For the battery pack, all that is added is a resistor. I think it's
something weird like 71.5k.
Kurt
On Mon, Nov 23, 2020, at 1:18 PM, Stephen Adolph wrote:
> thanks Bert,
> I found another document
> -Original Message-
> Option 1: 47 ohm
> - works, but does not prevent reverse conduction from batteries to an
> unplugged wallwart
>
> option 2: 10 ohms + silicon diode:
> - protects from reverse current, but drops the voltage for charging
>
> option 3: 10 ohms + schottky diode
> -
HI,
I did a similar modification to this when I was much younger.
It worked beautifully. Later I installed a LM317 voltage regulator on a
heatsink inside the uinti so I could power it with 12V, like the rest of my
Amateur Radio gear. The unit would stay plugged into permanent power for
days.
> -Original Message-
> Jim, this sounds like a fantastic solution to one of my problems. I
> don't need in-circuit charging (I always have spare NiMH AAs, but I
> rarely travel with an AC adapter) but I would love for the low batt
> light to actually provide some function again.
Yeah,
> -Original Message-
> It worked beautifully. Later I installed a LM317 voltage regulator on a
> heatsink inside the uinti so I could power it with 12V, like the rest of
> my Amateur Radio gear.
Oh man... I wanted to do this, too, and I was going to make a rectangular
opening in the top
thanks for that Jim. I checked and I have the "silicon diode + resistor"
version of this mod on my M100 now.
In my M100 (powered off):
Wall wart voltage = 7.5V
Voltage @ 4xAA = 5.5V (while charging)
Voltage across resistor/diode = 2V
I'll monitor this as it charges up. Ideally I think one would
On Nov 23, 2020, at 1:47 PM, Jim Anderson wrote:
> This could be done in exactly the same way by piggybacking a 94.4k 1/4W
> resistor parallel onto R108 in the M100.
Jim, this sounds like a fantastic solution to one of my problems. I don't need
in-circuit charging (I always have spare NiMH
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