On Nov 23, 2020, at 8:10 PM, Jim Anderson wrote:
> Checking the T102 service manual, you're in luck - in the 102 it's still
> called R108 and it's still a conventional through-hole resistor instead of a
> surface-mount device like most of the rest of the resistors.
Jim, your detailed informat
> -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
> -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, sam
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 AAs
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 w
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. T
> -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
> - al
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 (M
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 P
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
unplugged
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 kee
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
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