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Rudinhoob said:What's the loading effect?
Kholdstare said:Sorry I was too fast to say it is loading effect. Actually in this case with OPAMP loading effect won't happen. Your output current should not change with R but it should change with V.
Can you show me screenshot of the schematic or netlist?
Rudinhoob said:i = V/R so it changes with V or R, not R-load.
Rudinhoob said:The grounded R.
Rudinhoob said:While the current is supposed to be constant through out the load, it does not seem the case with spice, when altering V or R.
Thanks.
I think you misunderstood what the circuit is meant to do (and I'm also confused by the previous post!)
If V and R are constant, it keeps the current through RL constant if RL changes. (The constant current = V/R.)
If you change V or R, you get a different "constant" current through RL.
0xDEADBEEF said:Did you check if you hit the rails (does the output voltage of the op amp reach the supply voltage)?
carlgrace said:Hahah that famous "What's all this SPICE stuff anyway?" article! :)
That thing is so obsolete it isn't even funny.
Although the photo of Bob throwing his PC off the roof of the National Semiconductor parking lot was pretty funny.
I knew Bob (he passed away a couple of years ago) and he refuted that article years ago. He used SPICE. In fact, in a modern IC, breadboarding is MUCH more likely to lie to you than SPICE.
A voltage-to-current converter circuit is an electronic circuit that converts a voltage signal into a corresponding current signal. It is commonly used in applications where a voltage signal needs to be converted to a current signal for accurate measurements or control.
A voltage-to-current converter circuit uses a combination of resistors, operational amplifiers, and feedback loops to convert the input voltage signal into a proportional output current signal. The feedback loop ensures that the output current remains constant, regardless of changes in the input voltage.
Simulating a voltage-to-current converter circuit in OrCAD Spice allows for a virtual testing and analysis of the circuit's performance before building it in real life. It helps in identifying any potential issues or improvements that can be made to the circuit design.
One of the main advantages of using a voltage-to-current converter circuit is its ability to accurately convert a voltage signal to a current signal, which is essential in many electronic applications. It also provides a high level of stability and precision, making it suitable for sensitive measurements and control systems.
Voltage-to-current converter circuits are commonly used in applications such as sensor interfacing, current sensing, and signal conditioning. They are also used in power supply circuits, data acquisition systems, and various industrial control systems.