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Changing DC level from a sensor

J

JERD

Jan 1, 1970
0
I have a sensor whose output varies from +2.5 volts DC to + 4.5volts DC.
I would like to 'shift' this to become 0 - 2volts DC.
Presumably with an op-amp?
Single supply IC preferable e.g. LM358
Appreciate some advice on how to accomplish this.

JERD
 
T

terryc

Jan 1, 1970
0
I have a sensor whose output varies from +2.5 volts DC to + 4.5volts DC.
I would like to 'shift' this to become 0 - 2volts DC. Presumably with an
op-amp?
Single supply IC preferable e.g. LM358 Appreciate some advice on how to
accomplish this.

Put a 2v zener ad a resistor in series across the output and take the
reading off the resistors?
 
J

Jasen Betts

Jan 1, 1970
0
I have a sensor whose output varies from +2.5 volts DC to + 4.5volts DC.
I would like to 'shift' this to become 0 - 2volts DC.
Presumably with an op-amp?
Single supply IC preferable e.g. LM358
Appreciate some advice on how to accomplish this.


simple summing network:

.--R--0V
|
in --R-o-+\
| >-o--- out
2.5V -R-o--/ |
| |
`--R--'

dunno how close to 0V that'll go, use larger R if necessary.
 
T

Trevor Wilson

Jan 1, 1970
0
JERD said:
I have a sensor whose output varies from +2.5 volts DC to + 4.5volts DC.
I would like to 'shift' this to become 0 - 2volts DC.
Presumably with an op-amp?
Single supply IC preferable e.g. LM358
Appreciate some advice on how to accomplish this.

**Buy yourself a copy of Walt Jung's 'OP Amp Coookbook'. You can work it out
for yourself. Alternatively, you can scan the Natsemi datasheets for some
common OP amps. There will probably be an application note suitable for your
needs.
 
J

JERD

Jan 1, 1970
0
Mark Harriss said:
Does it have to go down to zero?, if not, a resistor divider could work
fine.

Thanks for all replies of assistance.

My preference is for it to go to zero.

I am going to have a try of all of the suggestions and increase my knowledge
at the same time. At age 68 the brain doesn't work as well as I would like
these days!

JERD
 
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