Re: [M100] USB "juice pack"

[Josh Malone]

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  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
>
>

Re: [M100] USB "juice pack"

[Howard Pepper]

Back in my Navy days, I took my Model 100 on a Mediterranean cruise
(1986-1987), and powered the 100 for the entire six and a half months on
one 6VDC lantern battery.  I just picked up a cord and connector from
Radio Shack, and used alligator clips to attach the cord to the
battery.  I could go down to the Petty Officer 1st class mess, slip the
battery in my jacket pocket, and work away.

Howard


On 12/03/2015 12:13 AM, Peter Vollan wrote:
> There is a Radio Shack part that a cigar plug that output 6VDV and had
> an adaptaplug so that any connector could be used. Do not remember the
> part number just now.
>
>
> On 28 November 2015 at 09:56, Steven Ranft <s_ra...@hotmail.com> wrote:
>> I found this on Amazon here in the US.
>>
>> http://www.amazon.com/gp/product/B00H01VGTQ?redirect=true_=cm_cr_ryp_prd_ttl_sol_0
>>
>> It has the same DC to DC converter as the cable John Hogerhuis located in
>> the UK.
>> The DC to DC converter boosts the 5V output of the "juice pack" to 6V, which
>> is what your Tandy AC adapter outputs.
>>
>> For only $10 it look like a good deal.
>>
>> The output plug would need to be changed to suit the M100, but the voltage
>> should be fine. 6VDC
>> If you don't solder, these might work for you:
>> http://www.amazon.com/Power-Cable-Female-Connector-Camera/dp/B00EK6OAF6/ref=cm_cd_al_qh_dp_t
>>
>> Unfortunately you would need a meter to be sure how to get the polarity
>> correct for the M100.
>>
>> Obviously, If you can solder and have a meter you can find a plug that would
>> be more elegant.
>>
>>
>>
>> Steve Ranft
>>
>> Savage, MN
>>
>>
>> 
>> Date: Fri, 27 Nov 2015 22:44:08 -0600
>> From: b...@bellsouth.net
>> To: m100@lists.bitchin100.com
>> Subject: Re: [M100] USB "juice pack"
>>
>> Hi John,
>>
>> I use a 6v lantern battery in a plastic frame with a power switch and cable
>> with the correct barrel connector on it.  I got it while I was living in
>> Australia before I moved over to the USA do i don't know what the part
>> number is.  I may have even got it at the local tandy store  :-)
>>
>> Cheers,Bert
>>
>>
>>
>>  Original message 
>> Subject: [M100] USB "juice pack"
>> From: "John R. Hogerhuis" <jho...@pobox.com>
>> To: Model 100 Discussion <m100@lists.bitchin100.com>
>> CC:
>>
>>
>> Anyone know what it takes to use the phone charger "juice packs" to run a
>> M100?
>>
>> Is there an off the shelf connector or converter needed or would I
>> have to build something myself?
>>
>> I have a handful of vendor swag cheapie units laying around. Running a
>> Raspberry Pi off one of them.
>>
>> -- John.

Re: [M100] USB "juice pack"

[Jeff Gonzales]

no wheezing the juice!

https://www.youtube.com/watch?v=nPn6sqGUM5A

On Thu, Dec 3, 2015 at 3:28 PM, John R. Hogerhuis  wrote:

> You know I guess I never said why I was interested in the juice packs
> relative to M100.
>
> Basically it is to power a Pi as a storage device and internet bridge yet
> still be mobile.
>
> But then I thought, since we have the extra weight anyway, what if the
> M100 could be powered from the same juicepack. It would give a little extra
> justification to schlep around the juicepack and PI setup.
>
> Otherwise, yeah... the M100 is already portable enough.
>
> -- John.
>

Re: [M100] USB "juice pack"

[John R. Hogerhuis]

You know I guess I never said why I was interested in the juice packs
relative to M100.

Basically it is to power a Pi as a storage device and internet bridge yet
still be mobile.

But then I thought, since we have the extra weight anyway, what if the M100
could be powered from the same juicepack. It would give a little extra
justification to schlep around the juicepack and PI setup.

Otherwise, yeah... the M100 is already portable enough.

-- John.

Re: [M100] USB "juice pack"

[Josh Malone]

The pi requires a huge amount of juice relative to the tandy. A stripped
down pi will need 500 - 700 mA. The tandy I think needs less than 100.
On Dec 3, 2015 4:18 PM, "John R. Hogerhuis"  wrote:

>
>
> On Thursday, December 3, 2015, Mike Stein  wrote:
>
>> Sounds like a lot of stuff to schlep around; would powering the Pi from
>> the bar code port make any sense?
>>
>
>
>
> Definitely an interesting experiment
>
> -- John.
>

Re: [M100] USB "juice pack"

[Mike Stein]

Sounds like a lot of stuff to schlep around; would powering the Pi from the bar 
code port make any sense?
  - Original Message - 
  From: John R. Hogerhuis 
  To: Model 100 Discussion 
  Sent: Thursday, December 03, 2015 3:28 PM
  Subject: Re: [M100] USB "juice pack"


  You know I guess I never said why I was interested in the juice packs 
relative to M100. 


  Basically it is to power a Pi as a storage device and internet bridge yet 
still be mobile.


  But then I thought, since we have the extra weight anyway, what if the M100 
could be powered from the same juicepack. It would give a little extra 
justification to schlep around the juicepack and PI setup.


  Otherwise, yeah... the M100 is already portable enough.


  -- John.

Re: [M100] USB "juice pack"

[Peter Vollan]

What we need is a USB to adaptaplug cable.


On 27 November 2015 at 13:40, Brad Whitlock  wrote:
> The juice packs should put out 5V, the same as you'd get from 4 rechargeable
> batteries, so it should just be a matter of making a cable with USB on one
> end and the right size coax power on the other.
>
> Alkaline AA battery capacity ranges from 1800-2600 mAH, so for a 2200 mAh
> juice pack I'd expect the M100 to run about as long as it does on alkaline
> AAs.  Make sense?
>
> Brad
> 
> From: John R. Hogerhuis 
> To: Model 100 Discussion 
> Sent: Friday, November 27, 2015 2:57 PM
> Subject: [M100] USB "juice pack"
>
> Anyone know what it takes to use the phone charger "juice packs" to run a
> M100?
>
> Is there an off the shelf connector or converter needed or would I
> have to build something myself?
>
> I have a handful of vendor swag cheapie units laying around. Running a
> Raspberry Pi off one of them.
>
> -- John.
>
>

Re: [M100] USB "juice pack"

[Jeff Gonzales]

I just got one of these:

http://www.amazon.com/Schumacher-XP2260-Instant-Portable-Source/dp/B004EIAADG

It should power my m100 for awhile.  :)

On Wed, Dec 2, 2015 at 10:57 PM, Peter Vollan  wrote:

> What we need is a USB to adaptaplug cable.
>
>
> On 27 November 2015 at 13:40, Brad Whitlock 
> wrote:
> > The juice packs should put out 5V, the same as you'd get from 4
> rechargeable
> > batteries, so it should just be a matter of making a cable with USB on
> one
> > end and the right size coax power on the other.
> >
> > Alkaline AA battery capacity ranges from 1800-2600 mAH, so for a 2200 mAh
> > juice pack I'd expect the M100 to run about as long as it does on
> alkaline
> > AAs.  Make sense?
> >
> > Brad
> > 
> > From: John R. Hogerhuis 
> > To: Model 100 Discussion 
> > Sent: Friday, November 27, 2015 2:57 PM
> > Subject: [M100] USB "juice pack"
> >
> > Anyone know what it takes to use the phone charger "juice packs" to run a
> > M100?
> >
> > Is there an off the shelf connector or converter needed or would I
> > have to build something myself?
> >
> > I have a handful of vendor swag cheapie units laying around. Running a
> > Raspberry Pi off one of them.
> >
> > -- John.
> >
> >
>

Re: [M100] USB "juice pack"

[Lee Kelley]

I do think that might be powerful enough, just not quite pocket sized or
all that portable.  But *definitely* plenty of juice.  And versatile too...

On Wed, Dec 2, 2015 at 9:59 PM, Jeff Gonzales  wrote:

> I just got one of these:
>
>
> http://www.amazon.com/Schumacher-XP2260-Instant-Portable-Source/dp/B004EIAADG
>
> It should power my m100 for awhile.  :)
>
> On Wed, Dec 2, 2015 at 10:57 PM, Peter Vollan 
> wrote:
>
>> What we need is a USB to adaptaplug cable.
>>
>>
>> On 27 November 2015 at 13:40, Brad Whitlock 
>> wrote:
>> > The juice packs should put out 5V, the same as you'd get from 4
>> rechargeable
>> > batteries, so it should just be a matter of making a cable with USB on
>> one
>> > end and the right size coax power on the other.
>> >
>> > Alkaline AA battery capacity ranges from 1800-2600 mAH, so for a 2200
>> mAh
>> > juice pack I'd expect the M100 to run about as long as it does on
>> alkaline
>> > AAs.  Make sense?
>> >
>> > Brad
>> > 
>> > From: John R. Hogerhuis 
>> > To: Model 100 Discussion 
>> > Sent: Friday, November 27, 2015 2:57 PM
>> > Subject: [M100] USB "juice pack"
>> >
>> > Anyone know what it takes to use the phone charger "juice packs" to run
>> a
>> > M100?
>> >
>> > Is there an off the shelf connector or converter needed or would I
>> > have to build something myself?
>> >
>> > I have a handful of vendor swag cheapie units laying around. Running a
>> > Raspberry Pi off one of them.
>> >
>> > -- John.
>> >
>> >
>>
>
>


-- 
*"I will never in my lifetime make a film that cannot be seen by the whole
family"*  Arther P. Jacobs

Re: [M100] USB "juice pack"

[Mike Stein]

Damn; they won't ship to Canada.

You could even top up your bike tires, but you'd still need what started all 
this, the USB<->M100 cable.

For $2.00 you could use this version (although you could of course just keep an 
AA four-pack in your pocket...):

That's one of my 'frontlight's in the foreground, optionally powered by BarCode 
connector or internal battery.




  - Original Message - 
  From: Jeff Gonzales 
  To: Model 100 Discussion 
  Sent: Wednesday, December 02, 2015 10:59 PM
  Subject: Re: [M100] USB "juice pack"


  I just got one of these: 


  http://www.amazon.com/Schumacher-XP2260-Instant-Portable-Source/dp/B004EIAADG



  It should power my m100 for awhile.  :)


  On Wed, Dec 2, 2015 at 10:57 PM, Peter Vollan <dprogra...@gmail.com> wrote:

What we need is a USB to adaptaplug cable.


On 27 November 2015 at 13:40, Brad Whitlock <bradw...@sbcglobal.net> wrote:
> The juice packs should put out 5V, the same as you'd get from 4 
rechargeable
> batteries, so it should just be a matter of making a cable with USB on one
> end and the right size coax power on the other.
>
> Alkaline AA battery capacity ranges from 1800-2600 mAH, so for a 2200 mAh
> juice pack I'd expect the M100 to run about as long as it does on alkaline
> AAs.  Make sense?
>
> Brad
> 
> From: John R. Hogerhuis <jho...@pobox.com>
> To: Model 100 Discussion <m100@lists.bitchin100.com>
> Sent: Friday, November 27, 2015 2:57 PM
> Subject: [M100] USB "juice pack"
>
> Anyone know what it takes to use the phone charger "juice packs" to run a
> M100?
>
> Is there an off the shelf connector or converter needed or would I
> have to build something myself?
>
> I have a handful of vendor swag cheapie units laying around. Running a
> Raspberry Pi off one of them.
>
> -- John.
>
>

Re: [M100] USB "juice pack"

[Peter Vollan]

There is a Radio Shack part that a cigar plug that output 6VDV and had
an adaptaplug so that any connector could be used. Do not remember the
part number just now.


On 28 November 2015 at 09:56, Steven Ranft <s_ra...@hotmail.com> wrote:
> I found this on Amazon here in the US.
>
> http://www.amazon.com/gp/product/B00H01VGTQ?redirect=true_=cm_cr_ryp_prd_ttl_sol_0
>
> It has the same DC to DC converter as the cable John Hogerhuis located in
> the UK.
> The DC to DC converter boosts the 5V output of the "juice pack" to 6V, which
> is what your Tandy AC adapter outputs.
>
> For only $10 it look like a good deal.
>
> The output plug would need to be changed to suit the M100, but the voltage
> should be fine. 6VDC
> If you don't solder, these might work for you:
> http://www.amazon.com/Power-Cable-Female-Connector-Camera/dp/B00EK6OAF6/ref=cm_cd_al_qh_dp_t
>
> Unfortunately you would need a meter to be sure how to get the polarity
> correct for the M100.
>
> Obviously, If you can solder and have a meter you can find a plug that would
> be more elegant.
>
>
>
> Steve Ranft
>
> Savage, MN
>
>
> 
> Date: Fri, 27 Nov 2015 22:44:08 -0600
> From: b...@bellsouth.net
> To: m100@lists.bitchin100.com
> Subject: Re: [M100] USB "juice pack"
>
> Hi John,
>
> I use a 6v lantern battery in a plastic frame with a power switch and cable
> with the correct barrel connector on it.  I got it while I was living in
> Australia before I moved over to the USA do i don't know what the part
> number is.  I may have even got it at the local tandy store  :-)
>
> Cheers,Bert
>
>
>
>  Original message 
> Subject: [M100] USB "juice pack"
> From: "John R. Hogerhuis" <jho...@pobox.com>
> To: Model 100 Discussion <m100@lists.bitchin100.com>
> CC:
>
>
> Anyone know what it takes to use the phone charger "juice packs" to run a
> M100?
>
> Is there an off the shelf connector or converter needed or would I
> have to build something myself?
>
> I have a handful of vendor swag cheapie units laying around. Running a
> Raspberry Pi off one of them.
>
> -- John.

Re: [M100] USB "juice pack"

[Mike Stein]

Something like this?

http://www.amazon.com/Universal-Adapter-Charger-500ma-Lighter/dp/B00K2FGTX0

But with the right USB cable an ordinary lighter USB adapter would be OK as 
well.

m

- Original Message - 
From: "Peter Vollan" <dprogra...@gmail.com>
To: "Model 100 Discussion" <m100@lists.bitchin100.com>
Sent: Thursday, December 03, 2015 12:13 AM
Subject: Re: [M100] USB "juice pack"


> There is a Radio Shack part that a cigar plug that output 6VDV and had
> an adaptaplug so that any connector could be used. Do not remember the
> part number just now.
> 
> 
> On 28 November 2015 at 09:56, Steven Ranft <s_ra...@hotmail.com> wrote:
>> I found this on Amazon here in the US.
>>
>> http://www.amazon.com/gp/product/B00H01VGTQ?redirect=true_=cm_cr_ryp_prd_ttl_sol_0
>>
>> It has the same DC to DC converter as the cable John Hogerhuis located in
>> the UK.
>> The DC to DC converter boosts the 5V output of the "juice pack" to 6V, which
>> is what your Tandy AC adapter outputs.
>>
>> For only $10 it look like a good deal.
>>
>> The output plug would need to be changed to suit the M100, but the voltage
>> should be fine. 6VDC
>> If you don't solder, these might work for you:
>> http://www.amazon.com/Power-Cable-Female-Connector-Camera/dp/B00EK6OAF6/ref=cm_cd_al_qh_dp_t
>>
>> Unfortunately you would need a meter to be sure how to get the polarity
>> correct for the M100.
>>
>> Obviously, If you can solder and have a meter you can find a plug that would
>> be more elegant.
>>
>>
>>
>> Steve Ranft
>>
>> Savage, MN
>>
>>
>> 
>> Date: Fri, 27 Nov 2015 22:44:08 -0600
>> From: b...@bellsouth.net
>> To: m100@lists.bitchin100.com
>> Subject: Re: [M100] USB "juice pack"
>>
>> Hi John,
>>
>> I use a 6v lantern battery in a plastic frame with a power switch and cable
>> with the correct barrel connector on it.  I got it while I was living in
>> Australia before I moved over to the USA do i don't know what the part
>> number is.  I may have even got it at the local tandy store  :-)
>>
>> Cheers,Bert
>>
>>
>>
>>  Original message 
>> Subject: [M100] USB "juice pack"
>> From: "John R. Hogerhuis" <jho...@pobox.com>
>> To: Model 100 Discussion <m100@lists.bitchin100.com>
>> CC:
>>
>>
>> Anyone know what it takes to use the phone charger "juice packs" to run a
>> M100?
>>
>> Is there an off the shelf connector or converter needed or would I
>> have to build something myself?
>>
>> I have a handful of vendor swag cheapie units laying around. Running a
>> Raspberry Pi off one of them.
>>
>> -- John.

Re: [M100] USB "juice pack"

[Steven Ranft]

I found this on Amazon here in the US. 
http://www.amazon.com/gp/product/B00H01VGTQ?redirect=true_=cm_cr_ryp_prd_ttl_sol_0
It has the same DC to DC converter as the cable John Hogerhuis located in the 
UK.The DC to DC converter boosts the 5V output of the "juice pack" to 6V, which 
is what your Tandy AC adapter outputs.
For only $10 it look like a good deal.
The output plug would need to be changed to suit the M100, but the voltage 
should be fine. 6VDCIf you don't solder, these might work for 
you:http://www.amazon.com/Power-Cable-Female-Connector-Camera/dp/B00EK6OAF6/ref=cm_cd_al_qh_dp_t
 
Unfortunately you would need a meter to be sure how to get the polarity correct 
for the M100.
Obviously, If you can solder and have a meter you can find a plug that would be 
more elegant.


Steve Ranft 
Savage, MN

Date: Fri, 27 Nov 2015 22:44:08 -0600
From: b...@bellsouth.net
To: m100@lists.bitchin100.com
Subject: Re: [M100] USB "juice pack"

Hi John,
I use a 6v lantern battery in a plastic frame with a power switch and cable 
with the correct barrel connector on it.  I got it while I was living in 
Australia before I moved over to the USA do i don't know what the part number 
is.  I may have even got it at the local tandy store  :-)
Cheers,Bert


 Original message 
Subject: [M100] USB "juice pack" 
From: "John R. Hogerhuis" <jho...@pobox.com> 
To: Model 100 Discussion <m100@lists.bitchin100.com> 
CC:  


Anyone know what it takes to use the phone charger "juice packs" to run a M100?

Is there an off the shelf connector or converter needed or would I
have to build something myself?

I have a handful of vendor swag cheapie units laying around. Running a
Raspberry Pi off one of them.

-- John.
  

Re: [M100] USB "juice pack"

[John R. Hogerhuis]

Thanks!

Actually Steven I think this is the same seller as I saw on Amazon UK. It
seems in the US he just advertises the cables for specific devices instead
of by specification.

I'll write to the seller and see if the exact 6v negative polarity
5.5mm/2.1mm cable can be purchased.

-- John.

Re: [M100] USB "juice pack"

[John R. Hogerhuis]

On Fri, Nov 27, 2015 at 1:01 PM, Mitch Parker  wrote:
> John,
>
> How many hours can you run a pi from one? I have quite a stash myself, and
> they are all between 2000 and 2600 mAh.
>
> Thanks,
>
> Mitch
>

Not sure haven't measured. I guess it depends on which one. They seem
to range from 300-700maH.

So these small juice packs give you a few "portable" hours.

-- John.

Re: [M100] USB "juice pack"

[Fred Whitaker]

You could make a short adapter to plug into the Model-T that reverses the 
polarity of the connector. My question is,"Is the output adequate?"

Sent from Outlook Mobile



On Fri, Nov 27, 2015 at 1:20 PM -0800, "John R. Hogerhuis" 
> wrote:

On Fri, Nov 27, 2015 at 1:01 PM, Mitch Parker  wrote:
> John,
>
> How many hours can you run a pi from one? I have quite a stash myself, and
> they are all between 2000 and 2600 mAh.
>
> Thanks,
>
> Mitch
>

Not sure haven't measured. I guess it depends on which one. They seem
to range from 300-700maH.

So these small juice packs give you a few "portable" hours.

-- John.

Re: [M100] USB "juice pack"

[John R. Hogerhuis]

On Fri, Nov 27, 2015 at 1:40 PM, Brad Whitlock  wrote:
> The juice packs should put out 5V, the same as you'd get from 4 rechargeable
> batteries, so it should just be a matter of making a cable with USB on one
> end and the right size coax power on the other.
>


OK so power wise should be compatible.

Anyone know the physical specs of the barrel connector needed to plug
to M100 power jack? Looks like they have some cables that are close to
what's needed.

-- John.

Re: [M100] USB "juice pack"

[Bert Put]

Hi John,

I use a 6v lantern battery in a plastic frame with a power switch and cable 
with the correct barrel connector on it.  I got it while I was living in 
Australia before I moved over to the USA do i don't know what the part number 
is.  I may have even got it at the local tandy store  :-)

Cheers,    Bert

 Original message 
Subject: [M100] USB "juice pack" 
From: "John R. Hogerhuis"  
To: Model 100 Discussion  
CC:  

Anyone know what it takes to use the phone charger "juice packs" to run a M100?

Is there an off the shelf connector or converter needed or would I
have to build something myself?

I have a handful of vendor swag cheapie units laying around. Running a
Raspberry Pi off one of them.

-- John.

Re: [M100] USB "juice pack"

[Mitch Parker]

John,

I was looking at the Pi Zero and figuring that having that and an FTDI
adapter would get you something you could possibly run your tools on and
have a full TPDD plus other tools in a small space that would be a "bump"
on the end of a m102 or m100 (or 200 in my case).  I'm probably going to
get at least 1-2 more adapters this week when I am at a conference.

I guess I'll be waiting for the Pi Zero to get back in stock.  They sold
out of all of them in under 24 hours.

Mitch

On Fri, Nov 27, 2015 at 4:20 PM John R. Hogerhuis  wrote:

> On Fri, Nov 27, 2015 at 1:01 PM, Mitch Parker  wrote:
> > John,
> >
> > How many hours can you run a pi from one? I have quite a stash myself,
> and
> > they are all between 2000 and 2600 mAh.
> >
> > Thanks,
> >
> > Mitch
> >
>
> Not sure haven't measured. I guess it depends on which one. They seem
> to range from 300-700maH.
>
> So these small juice packs give you a few "portable" hours.
>
> -- John.
>

Re: [M100] USB "juice pack"

[John R. Hogerhuis]

Looks like this is the right cable but they don't ship to US.

http://www.amazon.co.uk/USB-voltage-converter-cable-negative/dp/B011LO5KJE%3Fpsc%3D1%26SubscriptionId%3DAKIAJJKQFJJZIZTE4NFA%26tag%3Dantiviexplai-21%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3DB011LO5KJE%26ascsubtag%3Ddefaultcustomid

Re: [M100] USB "juice pack"

[Mitch Parker]

John,

How many hours can you run a pi from one? I have quite a stash myself, and
they are all between 2000 and 2600 mAh.

Thanks,

Mitch
On Fri, Nov 27, 2015 at 3:57 PM John R. Hogerhuis  wrote:

> Anyone know what it takes to use the phone charger "juice packs" to run a
> M100?
>
> Is there an off the shelf connector or converter needed or would I
> have to build something myself?
>
> I have a handful of vendor swag cheapie units laying around. Running a
> Raspberry Pi off one of them.
>
> -- John.
>

Re: [M100] USB "juice pack"

[Mark Wickens]

Yes, it's definitely worth re-iterating that Model 100 connector polarity
is the opposite of most all power supplies you could buy off the shelf
these days. The outside is positive, the inside negative. Having applied a
pack with a cable the wrong way round (guessing rather than reading the
manual!) I felt lucky to not have done any permanent damage - but any
reverse polarity protection should be thought of as a last resort rather
than to be relied on!

Regards, Mark.

On 27 November 2015 at 22:23, John R. Hogerhuis  wrote:

> I think I found the answer to my question on the barrel connector :
> "5.5 mm O.D. x 2.1 mm I.D., or size M coaxial (barrel type) DC power"
>
> I found USB->Barrel connector that have these specs except that they
> are positive center power pin instead of negative.
>
> So either I have to modify the cable slightly or keep looking.
>
> -- John.
>

Re: [M100] USB "juice pack"

[Josh Malone]

Looking at the Technical Reference Manual, there is a reverse-polarity
diode in series with the negative (center pin) of the jack. This provides
basic reverse-polarity protection but will also cause a small voltage drop
(typically 0.6-0.7 volts) between the DC input and the main power bus. If
you feed the usual 5.0 to 5.3 volts from a USB power pack into the DC
input, this would cause the main bus to only receive 4.3 to 4.6 volts. The
"Low Power" point on the 102 is listed as 4.1v so the unit may still
operate.

-Josh

On Fri, Nov 27, 2015 at 7:18 PM, Fred Whitaker  wrote:

> You could make a short adapter to plug into the Model-T that reverses the
> polarity of the connector. My question is,"Is the output adequate?"
>
> Sent from Outlook Mobile 
>
>
>
> On Fri, Nov 27, 2015 at 1:20 PM -0800, "John R. Hogerhuis" <
> jho...@pobox.com> wrote:
>
> On Fri, Nov 27, 2015 at 1:01 PM, Mitch Parker  wrote:
> > John,
> >
> > How many hours can you run a pi from one? I have quite a stash myself,
> and
> > they are all between 2000 and 2600 mAh.
> >
> > Thanks,
> >
> > Mitch
> >
>
> Not sure haven't measured. I guess it depends on which one. They seem
> to range from 300-700maH.
>
> So these small juice packs give you a few "portable" hours.
>
> -- John.
>

Re: [M100] USB "juice pack"

[Brad Whitlock]

The juice packs should put out 5V, the same as you'd get from 4 rechargeable 
batteries, so it should just be a matter of making a cable with USB on one end 
and the right size coax power on the other.
Alkaline AA battery capacity ranges from 1800-2600 mAH, so for a 2200 mAh juice 
pack I'd expect the M100 to run about as long as it does on alkaline AAs.  Make 
sense?
Brad  From: John R. Hogerhuis 
 To: Model 100 Discussion  
 Sent: Friday, November 27, 2015 2:57 PM
 Subject: [M100] USB "juice pack"
   
Anyone know what it takes to use the phone charger "juice packs" to run a M100?

Is there an off the shelf connector or converter needed or would I
have to build something myself?

I have a handful of vendor swag cheapie units laying around. Running a
Raspberry Pi off one of them.

-- John.