Hi everyone i am using an op amp as a voltage follower for a circuit to control some actuators as the output current from my controlled voltage output (from a device connected to my computer and controlled by LabVIEW) is not high enough. basically i need the output voltage (to the actuators) from the op amp to be equal to the input voltage.
i also need an LED to indicator that the op amp is working. i have connected an LED that way (shown in the schematic diagram below). output A,B,C and D goes to each of the actuators. the led was connected to the Vss pin of the MAX4234 op amp to ensure that current is following through the op amp and that it is functioning well.
however i read that the Vss supply is supposed to be connected to ground. from my circuit, when i vary the input voltage (eg input A), the voltage across the V+(Vdd) and V-(Vss) varies (it changes from 3.5V to 3.1V when i change the input at A from 0.1V to 1.5V) and the voltage across the LED varies, does this affect the performance of the op amp? My actuators have a resistance of about 50-60 ohms. should i redesign the circuit to place the LED at a different place without affecting the op amp's function? thank you!
i also need an LED to indicator that the op amp is working. i have connected an LED that way (shown in the schematic diagram below). output A,B,C and D goes to each of the actuators. the led was connected to the Vss pin of the MAX4234 op amp to ensure that current is following through the op amp and that it is functioning well.
however i read that the Vss supply is supposed to be connected to ground. from my circuit, when i vary the input voltage (eg input A), the voltage across the V+(Vdd) and V-(Vss) varies (it changes from 3.5V to 3.1V when i change the input at A from 0.1V to 1.5V) and the voltage across the LED varies, does this affect the performance of the op amp? My actuators have a resistance of about 50-60 ohms. should i redesign the circuit to place the LED at a different place without affecting the op amp's function? thank you!