Hi Guys,
I have a circuit I am constructing whereby i am feeding a voltage output from a sensor into an adc. However the output voltage swing of the sensor over the range i am using it is not sufficient to increment the adc counts by much so am using a differential amplifier between the two with the voltage output going to the positive pin and the negative pin connected to a potential divider circuit with a pot on one arm of the divider to allow me to control the divider voltage. However the output of my amplifier is not very stable and I'm extremely puzzled as to why. I do see an increase in amplifier output voltage for an increase in input voltage, but when the input settles at a steady state the output still moves around enough to cause inaccuracies even in my 8-bit adc. the amplifier i am using is in the link below
MC1741CP1 pdf, MC1741CP1 description, MC1741CP1 datasheets, MC1741CP1 view ::: ALLDATASHEET :::
Hope you can help
Tom
I have a circuit I am constructing whereby i am feeding a voltage output from a sensor into an adc. However the output voltage swing of the sensor over the range i am using it is not sufficient to increment the adc counts by much so am using a differential amplifier between the two with the voltage output going to the positive pin and the negative pin connected to a potential divider circuit with a pot on one arm of the divider to allow me to control the divider voltage. However the output of my amplifier is not very stable and I'm extremely puzzled as to why. I do see an increase in amplifier output voltage for an increase in input voltage, but when the input settles at a steady state the output still moves around enough to cause inaccuracies even in my 8-bit adc. the amplifier i am using is in the link below
MC1741CP1 pdf, MC1741CP1 description, MC1741CP1 datasheets, MC1741CP1 view ::: ALLDATASHEET :::
Hope you can help
Tom