Pspise error

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electronic4ever

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Dear All
I'm trying to simulate a circuit in pspice but it gives such an error like "Less than 2 connections at node N00043", i have attached the circuit for you to look at, could you please let me know where my problem is??

regards,
 

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  • 741-opamp_1.JPG
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Your circuit has the inputs on the opamp backwards so that it has positive feedback instead of negative feedback.
The sim program knows that an opamp amplifier must never have its inverting input (pin 2) grounded.
 
audioguru said:
Your circuit has the inputs on the opamp backwards so that it has positive feedback instead of negative feedback.
The sim program knows that an opamp amplifier must never have its inverting input (pin 2) grounded.
Click to expand...

so how can i fix it!!! can you send me the circuit please
 
Now the opamp will work but the resistor values are too low.

Your schematic is labelled "741 opamp" but shows an LM324 quad opamp that is completely different. Pin1 on a 741 is not its output and its power supply pins are different.
 
audioguru said:
Now the opamp will work but the resistor values are too low.

Your schematic is labelled "741 opamp" but shows an LM324 quad opamp that is completely different. Pin1 on a 741 is not its output and its power supply pins are different.
Click to expand...

oh yea that was a test, lets consider this circuit, i wanna get a gain of 10 but i still get the same error
 

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  • 741_opamp.JPG
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The circuit will work now but you should reduce the output from the generator so that the output of the opamp doesn't clip.
 
First you need to identify node "N00043". It might insist that all pins are accounted for, including pins 1 and 5 of the 741. You could connect them together with a 10Meg resistor. If that fails, inspect the models for any instance of "N00043".
 
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