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Sci.Electronics.Basics -> Re: Differential Amp
There are 5 messages in this thread.
You are currently looking at messages 1 to 5.
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Author: chuckDate: 04:30 28-02-07
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Michael wrote:
> Hi,
>
> I have a bank of 6 6V batteries and I'd like to be able to measure the
> voltage across each one. Would the best way be to use a diff amp as the
> voltage won't be relative to ground?
>
> If so, could someone please suggest a suitable IC that will won't go into
> saturation round the 45V area?
>
> Cheers,
>
> Michael
>
>
The batteries are in series and connected to a load? You can't
disconnect the load and simply measure the voltage of each battery with
a simple DMM?
I'm a bit confused by what you are trying to do, Michael.
Chuck
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Author: MichaelDate: 15:24 28-02-07
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Hi,
I have a bank of 6 6V batteries and I'd like to be able to measure the
voltage across each one. Would the best way be to use a diff amp as the
voltage won't be relative to ground?
If so, could someone please suggest a suitable IC that will won't go into
saturation round the 45V area?
Cheers,
Michael
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Author: MichaelDate: 17:00 28-02-07
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"chuck" <nospam@nospam.org> wrote in message
news:1172698329_5535@sp6iad.superfeed.net...
> Michael wrote:
>> Hi,
>>
>> I have a bank of 6 6V batteries and I'd like to be able to measure the
>> voltage across each one. Would the best way be to use a diff amp as the
>> voltage won't be relative to ground?
>>
>> If so, could someone please suggest a suitable IC that will won't go into
>> saturation round the 45V area?
>>
>> Cheers,
>>
>> Michael
>
> The batteries are in series and connected to a load? You can't disconnect
> the load and simply measure the voltage of each battery with a simple DMM?
>
> I'm a bit confused by what you are trying to do, Michael.
>
> Chuck
>
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Hi,
I'm building a robot that has 6 6V batteries as its power source and I'd
like to monitor each battery when the robot is operating. As it's designed
to work from some distance, I need to read the voltage and input it into the
onboard computer computer so it can be transmitted (IE I can't just use a
DMM as I won't be there to read it.)
Cheers,
Michael
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Author: Michael A. TerrellDate: 17:13 28-02-07
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Michael wrote:
>
> "chuck" <nospam@nospam.org> wrote in message
> news:1172698329_5535@sp6iad.superfeed.net...
> > Michael wrote:
> >> Hi,
> >>
> >> I have a bank of 6 6V batteries and I'd like to be able to measure the
> >> voltage across each one. Would the best way be to use a diff amp as the
> >> voltage won't be relative to ground?
> >>
> >> If so, could someone please suggest a suitable IC that will won't go into
> >> saturation round the 45V area?
> >>
> >> Cheers,
> >>
> >> Michael
> >
> > The batteries are in series and connected to a load? You can't disconnect
> > the load and simply measure the voltage of each battery with a simple DMM?
> >
> > I'm a bit confused by what you are trying to do, Michael.
> >
> > Chuck
> >
> > ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet
> > News==----
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> > Newsgroups
> > ----= East and West-Coast Server Farms - Total Privacy via Encryption
> > =----
>
> Hi,
>
> I'm building a robot that has 6 6V batteries as its power source and I'd
> like to monitor each battery when the robot is operating. As it's designed
> to work from some distance, I need to read the voltage and input it into the
> onboard computer computer so it can be transmitted (IE I can't just use a
> DMM as I won't be there to read it.)
>
> Cheers,
>
> Michael
Resistive dividers, and a mux to an A/D converter. BTDT, and its in
orbit.
--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.
Michael A. Terrell
Central Florida
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Author: john jardineDate: 18:31 28-02-07
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"Michael" <QmQiQcQhQaQeQlQhQiQmQsQ@QbQlQuQeQyQoQnQdQeQrQ.QcQoQ.QuQkQ>
wrote
in message news:oylFh.3307$1E3.2571@fe3.news.blueyonder.co.uk...
> Hi,
>
> I have a bank of 6 6V batteries and I'd like to be able to measure the
> voltage across each one. Would the best way be to use a diff amp as the
> voltage won't be relative to ground?
>
> If so, could someone please suggest a suitable IC that will won't go into
> saturation round the 45V area?
>
> Cheers,
>
> Michael
For one diff' measurement it's simple to just use a standard opamp and
resistors to knock the voltage down and increase the common voltage range.
This example would put out 1/10 of the diff' voltage in. Ie 0.60V for a 6.0V
battery. That 6 volts could be sat on top of anything from 0V upto about 45V
10k
___
,----|___|---,
| |
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| 5V |
| -o- |
100k | | |
___ | |\| |
( - ) in o------|___|----o----|-\ | Out
___ | >----o------o
( + ) in o------|___|----o----|+/ 0-5V
| |/| o
100k .-. | |
| | -o- --o--
10k| | 0V 0V
'-'
| Opamp is a 'rail to rail' in&out type
--o--
0V
(created by AACircuit v1.28 beta 10/06/04 www.tech-chat.de)
--
Posted via a free Usenet account from http://www.teranews.com
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