2) On the AD822 datasheet, it says:Single-supply capability from 5 V to 30 VDual-supply capability from ±2.5 V to ±15 VDoes that mean that the output is 2.5-15 only if i'm using the dual circuit? Could someone please clarify as what that means.http://www.analog.com/media/en/technical-documentation/data-sheets/AD822.pdf
The "Licor sensor" sounds like a nomal photo sensor, covered with a generous amount of snake oil.
Absolute Calibration: ± 5% traceable to the U.S. National Institute of Standards and Technology (NIST) Sensitivity: Typically 30 μA per 100 klux Linearity: Maximum deviation of 1% up to 100 klux Response Time: Less than 1 μs (2 m cable terminated into a 604 Ohm load) Temperature Dependence: ± 0.15% per °C maximum Cosine Correction: Cosine corrected up to 82° angle of incidence Azimuth: < ± 1% error over 360° at 45° elevation
Post your (current) circuit
Hi,So i'm trying to amplify the signal from a photometric licor sensor and record it with Arduino. There is only one problem: the signal peaks at low light intensity (please see attached picture of circuit)I tried increasing the 100kohm resistor, what happens is that the upper voltage limit drops down to 2.9v but it remains as the maximum value.Can you spot anything wrong with this circuit?
@Wawa,I seriously doubt the OP is old enough to know what you mean by SNAKE OIL@OP,You heard the man. Power the op amp off the arduino 5V.You need a Gain of :sensor max output voltage = 10mV (0.010 V)Arduino max analog input voltage = 5V5.00/0.010 = 500A = 500.Gain of Non-inverting amp = Rf/Rin +1500-1=499Let Rf = 500 k ohmRin = 500 k /A = 1 k ohm (technically 998 , but 1k is close enough)Op Amp Non-Inverting Amplifier