I have a voltage changing slowly against response to a sensor from
10V----->5V . I have 5V single supply OPamp , now how to scale it down to 0V----->5V .
I have a voltage changing slowly against response to a sensor from
10V----->5V . I have 5V single supply OPamp , now how to scale it down to 0V----->5V .
do you know anything about the sensor? if it has a low output impedance and can source some current without distorting the signal, you may be able to scale down the sensor output prior to the op amp.
you could use a voltage divider but that would produce 2.5-5 volts output. if you want to transfer 5-10 volts into a 0-5 volts then you want to subtract not divide. I think you need a differential amplifier arrangement with a gain of 1 on both inputs
The Opamp I have is OPA2335 , powered with 0V and 5V . The signal I get is reverse 10V------>5V (it can be 5V---->2.5V with a divider) .But even if I subtract that I get a -Ve sign? which cannot be handeled .
The Opamp I have is OPA2335 , powered with 0V and 5V . The signal I get is reverse 10V------>5V (it can be 5V---->2.5V with a divider) .But even if I subtract that I get a -Ve sign? which cannot be handeled .
Hi,
I am afraid I dont follow you . Do you say to use the difference amplifiers NON-INV input to be heald at 2.5V ,and the INV should be fed the input signal? . If thats the case after divider I get 5V----->2.5V , and when subtraction on the higher side is done I get 2.5-5=-2.5V ? .
Hi,
I am afraid I dont follow you . Do you say to use the difference amplifiers NON-INV input to be heald at 2.5V ,and the INV should be fed the input signal? . If thats the case after divider I get 5V----->2.5V , and when subtraction on the higher side is done I get 2.5-5=-2.5V ? .
I have a voltage changing slowly against response to a sensor from
10V----->5V . I have 5V single supply OPamp , now how to scale it down to 0V----->5V .
Thanks , you are right I slipped the '-1' . I think it will require a gain of 2 (or please correct me ) . holding NON-INV end at 5V . now I get 5-5*-2=0V ,5-2.5*-2=5V .
The common mode range of the OPA2335 is -0.1V to +3.5V.
The transfer function is
Vout=10-Vin.
This must be accomplished within the common mode range.
See below.
It could be accomplished with one op amp, but the resistor values get pretty funky.
The common mode range of the OPA2335 is -0.1V to +3.5V.
The transfer function is
Vout=10-Vin.
This must be accomplished within the common mode range.
See below.
It could be accomplished with one op amp, but the resistor values get pretty funky.
The common mode range of the OPA2335 is -0.1V to +3.5V.
The transfer function is
Vout=10-Vin.
This must be accomplished within the common mode range.
See below.
It could be accomplished with one op amp, but the resistor values get pretty funky.
Also, if a small error is acceptable and the loading wont bother the sensor,
then making R3=2k and R4=1k and eliminating U1 also works ok. That gets us
back down to one single op amp.
Also, if a small error is acceptable and the loading wont bother the sensor,
then making R3=2k and R4=1k and eliminating U1 also works ok. That gets us
back down to one single op amp.