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The two 0 volt inputs are not tied together. However, both are actually at 0 with respect to ground and always have a potential of 0 volts between them. One is connected to the ground of a DAQ card and the other is connected to the zero volt terminal of the psu. I have tried connecting them...
Thanks for the replies (and sorry for my late reply)!
I have followed your suggestions and replaced the op-amp for something more suitable. I removed the LED and changed the circuit slightly to suit the new op-amp. The circuit works perfectly.
cheers for you help! J
Hi.
I'm using a NI USB-6009 data acquisition card to send a signal to a proportional pressure controller which varies the supply pressure to a pneumatic system. Unfortunately, the pressure controller requires a 0-10V analogue control signal and the 6009 can only do 0-5V (very low current)...
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