Re: Differential Amp
- From: "john jardine" <john@xxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 28 Feb 2007 23:31:05 -0000
"Michael" <QmQiQcQhQaQeQlQhQiQmQsQ@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote
in message news:oylFh.3307$1E3.2571@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
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
___
,----|___|---,
| |
| |
| 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)
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