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'[EE] (Fwd) [Keelynet] DIY supercapacitor as a 9VDC'
2005\12\07@111538 by Mark Jordan

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------- Forwarded message follows -------

Subject:                [Keelynet] DIY supercapacitor as a 9VDC battery & more
Date sent:              Wed, 07 Dec 2005 06:27:58 -0600

Check out this way cool 9vdc battery modification that uses a 10 FARAD
capacitor....lasts up to 3 hours and recharges in 20 seconds.

12/07/05 - Supercap 9VDC Battery

http://www.bairesrobotics.com.ar/elektor/10-2003%20SuperCap%20Battery.pdf

9V batteries are often found in devices that aren t used very often. If
you use a NiCd rechargeable battery you may find it completely
discharged by the time you need it.

Capacitors on the other hand can maintain their charge for years. This
circuit uses a 10F cap with a switching voltage regulator to increase
the voltage from 2.3V to 9V.

With a light load the cap will last up to 3 hours and once discharged it
can be recharged in less than 20 seconds. Warning: PDF link.

------- End of forwarded message -------


2005\12\07@112820 by Alan B. Pearce

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>Check out this way cool 9vdc battery modification
>that uses a 10 FARAD capacitor....lasts up to 3 hours
>and recharges in 20 seconds.

Hmm, I can think of a use for that ... Thanks

2005\12\07@120353 by Michael Rigby-Jones

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{Quote hidden}

attery.pdf

>9V batteries are often found in devices that aren t used very often. If
>you use a NiCd rechargeable battery you may find it completely
>discharged by the time you need it.

>Capacitors on the other hand can maintain their charge for years.

A rather bogus claim in relation to supercaps.  The leakage current of the part used in that project is 1.2mA at 25 degrees C, which is not going to let it hold it's charge for more than a day or so, let alone years.

The basic discrete switcher is also pretty poor with a quiescent of 2mA, it should be possible to better this by a factor of 10-20 without much difficulty.

Regards

Mike

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2005\12\07@122628 by Enrico Schuerrer

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----- Original Message -----
From: "Michael Rigby-Jones" <.....Michael.Rigby-JonesKILLspamspam.....bookham.com>
To: "Microcontroller discussion list - Public." <EraseMEpiclistspam_OUTspamTakeThisOuTmit.edu>
Sent: Wednesday, December 07, 2005 6:03 PM
Subject: RE: [EE] (Fwd) [Keelynet] DIY supercapacitor as a 9VDC battery
&more


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| >{Original Message removed}

2005\12\07@124715 by Michael Rigby-Jones

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{Quote hidden}

Take at look at the micropower switcher design in the Art Of Electronics for a fairly discrete solution.  Micropower switcher IC's are made by most of the larger semiconductor manufacturers such as Maxim, Linear Technology etc. e.g. an LT1615-1 works down to 1 volt, and consumes just 20uA when operating.  It also comes in a tiny package which means you could maybe even pack two supercaps into your PP3 housing.

Regards

Mike

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2005\12\08@011342 by Juan Cubillo

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> Take at look at the micropower switcher design in the Art Of Electronics
for a fairly discrete solution.  Micropower switcher IC's are made by most
of the larger semiconductor manufacturers such as Maxim, Linear Technology
etc. e.g. an LT1615-1 works down to 1 volt, and consumes just 20uA when
operating.  It also comes in a tiny package which means you could maybe even
pack two supercaps into your PP3 housing.

Could anyone please post this circuit somewhere? I live in Costa Rica and
it´s VERY hard for me to get some of this books...
Thnkz
Juan Cubillo

2005\12\08@041218 by Russell McMahon

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>> Take at look at the micropower switcher design in the Art Of
>> Electronics
> for a fairly discrete solution.  Micropower switcher IC's are made
> by most
> of the larger semiconductor manufacturers such as Maxim, Linear
> Technology
> etc. e.g. an LT1615-1 works down to 1 volt, and consumes just 20uA
> when
> operating.  It also comes in a tiny package which means you could
> maybe even
> pack two supercaps into your PP3 housing.
>
> Could anyone please post this circuit somewhere? I live in Costa
> Rica and
> it´s VERY hard for me to get some of this books...


Google is (how come "EVERYONE" doesn't know this yet?) your friend.
Copyright violating copies of TAOE may not be available (and may) but app notes for LT products surely are.

eg

Google hit #3
       http://www.linear.com/pc/productDetail.do?navId=H0,C1,C1003,C1042,C1035,P1774

#2    http://www.zetex.com/3.0/a1-7.asp

Datasheet with applications data galore (rebuild URL :-( ).

   http://linear-tech.com.cn/pc/downloadDocument.do;jsessionid=C4O6H5M2PTvOEEzzcDlXHmPb0LmR3fjRadKVgi1qs3JfOrUZzQbo!-848388738?navId=H0,C1,C1003,C1042,C1035,P1774,D3577

LT1615 is tiny - and stupidly expensive. $US1.80 in 5000 quantity.

For a cheap and cheerful low cost solution with less efficiency, less cost and immense flexibility ask Google about MC34063


       RM

2005\12\08@044236 by Alan B. Pearce

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>LT1615 is tiny - and stupidly expensive. $US1.80 in 5000 quantity.

But LT do give free samples.

2005\12\08@060440 by Michael Rigby-Jones

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{Quote hidden}

42,C1035,P1774

{Quote hidden}

Russell,

The reason I picked the LT1615 from the numerous devices available was primarily it's ultra low quiescent current, and it's ability to work down to 1 volt.  Being tiny is a positive advantage for this application.

The MC34063 needs 3 volts minimum, and the datasheet lists an operating current of 4mA @5v.  The supercap has a maximum working voltage of 2.3volts which makes the Motorla a non-starter for this application.

Regards

Mike

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2005\12\08@065701 by Russell McMahon

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> The MC34063 needs 3 volts minimum, and the datasheet lists an
> operating current of 4mA @5v.  The supercap has a maximum working
> voltage of 2.3volts which makes the Motorla a non-starter for this
> application.

Unless you power it off its own boot straps ;-).
But, I agree that LT1615 is a far far far better solution technically.


       RM



2005\12\08@135953 by David P Harris

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Russell McMahon wrote:

>
> For a cheap and cheerful low cost solution with less efficiency, less
> cost and immense flexibility ask Google about MC34063

Here's a nice little calculator for the parts:
<http://www.nomad.ee/micros/mc34063a/index.shtml>

David



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