OT: Powering project from low voltage supplies?
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Posts: 46,084
Can anyone point me in the right direction? I would like to power a 500mA
Stamp project with 3.6 volts. (trio of NiMH cells) I found the icl7660 but
it looks like it is not even close to providing the current needed. I have
also found an app note regarding Shottky Voltage doublers but the
information is very limited. Do I need to look at a low voltage
Microcontroller? Lithium Batteries would solve my space/voltage requirements
but the environment will be damp and I am sure the batteries will eventually
get wet. Any Suggestions?
Jeff
[noparse][[/noparse]Non-text portions of this message have been removed]
Stamp project with 3.6 volts. (trio of NiMH cells) I found the icl7660 but
it looks like it is not even close to providing the current needed. I have
also found an app note regarding Shottky Voltage doublers but the
information is very limited. Do I need to look at a low voltage
Microcontroller? Lithium Batteries would solve my space/voltage requirements
but the environment will be damp and I am sure the batteries will eventually
get wet. Any Suggestions?
Jeff
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
the capacity needed for the battery.
Hank
Original Message
From: "Jeff Mitchell" <JMitchell@G...>
To: "Basicstamps@Yahoogroups. Com" <basicstamps@yahoogroups.com>
Sent: Monday, March 17, 2003 12:19 PM
Subject: [noparse][[/noparse]basicstamps] OT: Powering project from low voltage supplies?
> Can anyone point me in the right direction? I would like to power a 500mA
> Stamp project with 3.6 volts. (trio of NiMH cells) I found the icl7660 but
> it looks like it is not even close to providing the current needed. I have
> also found an app note regarding Shottky Voltage doublers but the
> information is very limited. Do I need to look at a low voltage
> Microcontroller? Lithium Batteries would solve my space/voltage requirements
> but the environment will be damp and I am sure the batteries will eventually
> get wet. Any Suggestions?
>
> Jeff
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and Body
of the message will be ignored.
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>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
Original Message
From: Hank Hagquist [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=RJPr4UfJOpNxaYXpZ1aPa7K83sJad9RKRsxi1bskOsxzHxc5rXoKwf7SHW1-K-WA-wWuxV7XYWF8]hankster@h...[/url
Sent: Monday, March 17, 2003 1:14 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] OT: Powering project from low voltage supplies?
How much mAh do you need the batteries to be? I may have a solution
depending on the capacity needed for the battery.
Hank
Original Message
From: "Jeff Mitchell" <JMitchell@G...>
To: "Basicstamps@Yahoogroups. Com" <basicstamps@yahoogroups.com>
Sent: Monday, March 17, 2003 12:19 PM
Subject: [noparse][[/noparse]basicstamps] OT: Powering project from low voltage supplies?
> Can anyone point me in the right direction? I would like to power a 500mA
> Stamp project with 3.6 volts. (trio of NiMH cells) I found the icl7660 but
> it looks like it is not even close to providing the current needed. I have
> also found an app note regarding Shottky Voltage doublers but the
> information is very limited. Do I need to look at a low voltage
> Microcontroller? Lithium Batteries would solve my space/voltage
requirements
> but the environment will be damp and I am sure the batteries will
eventually
> get wet. Any Suggestions?
>
> Jeff
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
To UNSUBSCRIBE, just send mail to:
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from the same email address that you subscribed. Text in the Subject and
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First you must determine what the current and voltage requirements of your
project are.
Second, determine how long you wish to operate.
Third, select a battery type (ni-cad, lithium, etc.) you wish to use.
(consider one time use, rechargable, weight,cost, etc.)
Fourth, using data sheets for the battery chemistry you have selected, find
the particular battery that will supply the voltage required for the time
necessary at the current your project requires. (over-spec the battery to
make up for temperature variations, lifetime deminished capacity, etc.) Some
battery types drop off voltage from initial use but some retain a voltage
level for a period of time then drop rapidly. You may need to use a higher
voltage battery and regulate it to the voltage you require. If you do, also
consider the loss in the regulator. Linear regulators are less efficient
than switching regulators but don't produce electrical noise which may
affect circuitry.
Then, determine how you will incorporate the batteries into the space
available. If they won't fit, re-think your design to provide more space or
mounting arrangements.
As you can see, you can't just pick a battery without considering several
design parameters.
Jim
Original Message
From: Hank Hagquist [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=IWljj8-nQTN9hZwXdmA81zPkvkIVSrt00eAzVM-vhgiQCj24HlLJ5gj52UGtIdocrewsg9cB4V2yA4bN]hankster@h...[/url
Sent: Monday, March 17, 2003 1:14 PM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] OT: Powering project from low voltage
supplies?
How much mAh do you need the batteries to be? I may have a solution
depending on the capacity needed for the battery.
Hank
Original Message
From: "Jeff Mitchell" <JMitchell@G...>
To: "Basicstamps@Yahoogroups. Com" <basicstamps@yahoogroups.com>
Sent: Monday, March 17, 2003 12:19 PM
Subject: [noparse][[/noparse]basicstamps] OT: Powering project from low voltage supplies?
> Can anyone point me in the right direction? I would like to power a 500mA
> Stamp project with 3.6 volts. (trio of NiMH cells) I found the icl7660 but
> it looks like it is not even close to providing the current needed. I have
> also found an app note regarding Shottky Voltage doublers but the
> information is very limited. Do I need to look at a low voltage
> Microcontroller? Lithium Batteries would solve my space/voltage
requirements
> but the environment will be damp and I am sure the batteries will
eventually
> get wet. Any Suggestions?
>
> Jeff
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/