Riger adsl2+ modem can use just 4.6v input ( spec says 5.2v )

[Lim PE]

No need for the supplied adaptor's 5.25v which [i] makes mdm
very hot = slower & less durable [ii] wastes electricity & aircon
bill ; just (4.6 � 5.25)� = 76.7 % of original wattage is needed.
Minimum voltage may be <4.6v.

[David Webb]

wondering if this works for all the modem/router, by supplying only 80%
of the intended power

[tanhks]

"Lim PE" <L...@zdmail.com> wrote in message
news:4a250f58$1...@news.tm.net.my...

Why would anyone want to save that small amount of electricity?
(modem consume very little electricity)

Use a laptop instead of a desktop can save huge amount of electricity.
A laptop consume only 70Watts but desktop need a least 200watts some even
300 or 400 Watts!

Use you own's electric generator instead of TNB's power might save money
also.

[Rkaru]

On 04/06/2009, tanhks wrote but may now claim to have been misquoted:

>
> "Lim PE" <L...@zdmail.com> wrote in message
> news:4a250f58$1...@news.tm.net.my...
> > No need for the supplied adaptor's 5.25v which [i] makes mdm
> > very hot = slower & less durable [ii] wastes electricity & aircon

> > bill ; just (4.6 w 5.25)2 = 76.7 % of original wattage is needed.

> > Minimum voltage may be <4.6v.
> >
>
> Why would anyone want to save that small amount of electricity?
> (modem consume very little electricity)
>
> Use a laptop instead of a desktop can save huge amount of electricity.
> A laptop consume only 70Watts but desktop need a least 200watts some
> even 300 or 400 Watts!
>
> Use you own's electric generator instead of TNB's power might save
> money also.

Use Dynamo can save or not?

--

[opcu]

"Rkaru" <rk...@streamyx.com> wrote in message
news:4a2c7...@news.tm.net.my...

good idea! ask sonny ( not Dave's ) to paddle the bicycle while you use your
laptop.

:) opcu

[Caroline]

> "Rkaru" <rk...@streamyx.com> wrote in message
> news:4a2c7...@news.tm.net.my...
>> On 04/06/2009, tanhks wrote but may now claim to have been misquoted:
>> Use Dynamo can save or not?

> good idea! ask sonny ( not Dave's ) to paddle the bicycle while you use
> your laptop.
>
> :) opcu

Ol' Pc, it's cute when I imagined Sonny ( not his real name ) paddling
bicycle and the
dynamo driving Rkaru's laptop... next you know, doc also want!

[doc]

Caroline wrote:
>> good idea! ask sonny ( not Dave's ) to paddle the bicycle while you
>> use your laptop.
>>
>> :) opcu
> Ol' Pc, it's cute when I imagined Sonny ( not his real name ) paddling
> bicycle and the
> dynamo driving Rkaru's laptop... next you know, doc also want!

I prefer Sunny power! No, not Sunil power.

[David Webb]

my desktop only needs 100W :)

[Franc Zabkar]

On Wed, 26 Aug 2009 14:02:45 +0800, David Webb
<no_spam...@yahoo.com> put finger to keyboard and composed:

>tanhks wrote:
>> "Lim PE" <L...@zdmail.com> wrote in message
>> news:4a250f58$1...@news.tm.net.my...
>>> No need for the supplied adaptor's 5.25v which [i] makes mdm
>>> very hot = slower & less durable [ii] wastes electricity & aircon
>>> bill ; just (4.6 � 5.25)� = 76.7 % of original wattage is needed.
>>> Minimum voltage may be <4.6v.

I suspect that few modem chips run on +5V. Instead they would operate
from 3.3V or 2.5V or 1.8V which would probably be generated by onboard
secondary switchmode regulators. Modern hard drives seem to follow
this design philosophy as well. Subregulation means that it doesn't
really matter whether the input is +5V or +6V -- losses in switchmode
regulators are not calculated in the same way as for linear
regulators. A good example that illustrates this is a TV with a
universal power supply that is capable of operating from both 110V and
240V.

As the OP's modem doesn't appear to have a USB port, I wonder what the
+5V is used for.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.