Tool/software:
Hello all,
I hope you're having a nice day.
Lately I have been sketching this constant current circuit that uses the TLV 9102S, a dual operational amplifier. The idea is to supply a constant current (1 mA) through a resistive sensor connected between the CC source and ground. This should then allow the voltage across the sensor to be measured to calculate its resistance.
This is my current design. I built the circuit on a piece of breadboard and measured it with a desktop multimeter. The load resistor was a 1 kΩ, 1 % resistor. The circuit produced an average current of 994.031 µA (min/max 993.853/995.457 µA) into the load over a 15-minute data logging period. The peak in the beginning shows the moment when the 12 V power supply was turned on.
Now I would be interested to know if there are some ways to improve this basic design?
Thanks!
