From: Phil Allison on
"Charles the Anencephalic Troll"

>
> At the microampere level,


** But it is not a few microamps.

FUCKWIT !!

Go DROP DEAD YOU STINKING LIAR !


From: Charles on

"Phil Allison" <phil_a(a)tpg.com.au> wrote in message
news:7sc1eeFuk8U1(a)mid.individual.net...
> "Charles the Anencephalic Troll"

You have earned the first PLONK of 2010! Congratulations.


From: Phil Allison on

"Charles the Anencephalic LYING Troll"

> At the microampere level,


** But it is not a few microamps.

FUCKWIT !!

Go DROP DEAD YOU STINKING LIAR !



From: David L. Jones on
Charles wrote:
> "Phil Allison" <phil_a(a)tpg.com.au> wrote in message
> news:7sc0fcFpp4U1(a)mid.individual.net...
>>
>> "Charles the Anencephalic Troll"
>> "Paul E. Schoen"
>>> "Phil Allison"
>>>>> "terryS"
>>>>>
>>>>> Thanks for the info John:
>>>>> That's what I was missing; the ampere hour capacity of the button
>>>>> cell. Amazing something with that small a volume can be 60ma/hr.
>>>>> Guess that is what the '60' in SR60W means!
>>>>> And yes; if 3 years that's (60 x 10to minus 3)Ah./24 x 365 x 3 =
>>>>> Of the order of 2.28 x 10to minus 6.Amps.
>>>>>
>>>>>
>>>>> ** Shame that JF failed to say the calc gives only the AVERAGE
>>>>> current drawn.
>>>>>
>>>>> The *peak current* draw at the moment of each "tick" is up to 100
>>>>> times higher.
>>>>>
>>>>> Has a big effect on the life span of the cell and what kind of cell
>>>>> ESR value is tolerable.
>>>>
>>>> I suppose there might be a capacitor in there to handle the peaks.
>>>>
>>>> Paul
>>>
>>> Good catch Paul.
>>
>>
>> ** There is never any such cap in a watch or battery wall clock
>
> At the microampere level, it does not require much of a capacitor to
> smooth out (supply) current peaks.

I doubt the current spikes for an analog watch would be in the microamp
range.

> And you will (of course not)
> supply documentation that there are no such smoothing/leveling
> capacitors in clocks/time pieces? Jackass.

Can't say I've seen one in any watch I've opened.
It would be a waste of 0.1cents (or whatever) and take up space.
And no real need for it when you have a battery with 10ohms ESR or so.

Dave.

--
================================================
Check out my Electronics Engineering Video Blog & Podcast:
http://www.eevblog.com


From: Paul E. Schoen on

"David L. Jones" <altzone(a)gmail.com> wrote in message
news:uw88n.15679$p66.11875(a)newsfe09.iad...
> Charles wrote:
>> "Phil Allison" <phil_a(a)tpg.com.au> wrote in message
>> news:7sc0fcFpp4U1(a)mid.individual.net...
>>>
>>> "Charles the Anencephalic Troll"
>>> "Paul E. Schoen"
>>>> "Phil Allison"
>>>>>> "terryS"
>>>>>>
>>>>>> Thanks for the info John:
>>>>>> That's what I was missing; the ampere hour capacity of the button
>>>>>> cell. Amazing something with that small a volume can be 60ma/hr.
>>>>>> Guess that is what the '60' in SR60W means!
>>>>>> And yes; if 3 years that's (60 x 10to minus 3)Ah./24 x 365 x 3 =
>>>>>> Of the order of 2.28 x 10to minus 6.Amps.
>>>>>>
>>>>>>
>>>>>> ** Shame that JF failed to say the calc gives only the AVERAGE
>>>>>> current drawn.
>>>>>>
>>>>>> The *peak current* draw at the moment of each "tick" is up to 100
>>>>>> times higher.
>>>>>>
>>>>>> Has a big effect on the life span of the cell and what kind of cell
>>>>>> ESR value is tolerable.
>>>>>
>>>>> I suppose there might be a capacitor in there to handle the peaks.
>>>>>
>>>>> Paul
>>>>
>>>> Good catch Paul.
>>>
>>>
>>> ** There is never any such cap in a watch or battery wall clock
>>
>> At the microampere level, it does not require much of a capacitor to
>> smooth out (supply) current peaks.
>
> I doubt the current spikes for an analog watch would be in the microamp
> range.
>
>> And you will (of course not)
>> supply documentation that there are no such smoothing/leveling
>> capacitors in clocks/time pieces? Jackass.
>
> Can't say I've seen one in any watch I've opened.
> It would be a waste of 0.1cents (or whatever) and take up space.
> And no real need for it when you have a battery with 10ohms ESR or so.

There is a detailed explanation of the analog quartz watch movement at
http://www.patentstorm.us/patents/4087957/description.html
and
http://www.freepatentsonline.com/4173863.html
and a PDF of the patent:
http://www.freepatentsonline.com/4173863.pdf

Since these use CMOS logic circuits I would be surprised if there were NOT
at least one small bypass capacitor across the battery power supply.

Here is a web page with some ASCII schematics of watch circuits:
http://www.rdrop.com/~cary/html/time.html

The Bulova Accutron:
http://www.elektron.demon.co.uk/accutron.html

And details on how it works:
http://www.elektron.demon.co.uk/works.html

Note that there is a capacitor on the base of the transistor. It appears to
contribute to the current pulse through the collector, which is shown to be
16 uA, with a duty cycle of maybe 10%. But this article states that a
running movement draws about 7 uA. In that case a 60 mA-Hr battery would be
expected to last 60,000/7 = 8571 hrs = 357 days or just about a year.

Paul