modified 11 years ago

Whats wrong - error of EveryCircuit

01:24:44

EveryCircuit doesnt find solution - but should work as a current source (forget about the left network it just delivers constant voltage) ..

published 11 years ago

Sine_eyed

11 years ago

I'm going to assume you have a perfectly good reason to have that Zero Volt- voltage source in place. That concept is over my head, but I did see that it is backwards so I cut the wires, flipped it around and gave it 10V like the others. Solution found. I don't really see much in the way of current sourcing, don't see much of a load to be drawing current. But it'll run- if you hook it up right...

hurz

11 years ago

Sine, see the 0V as ground, after that you can reduce all 5 resistors to 2 and all voltage sources to 1. So you get 10V and a voltage divider which gives you a constant voltage below 10V and above 0. The problem here is the way EC tries to find a starting point. Put a switch open to this voltage divider EC will find a solution to start at 0 volt. Then close it and the current source is working fine

Sine_eyed

11 years ago

Ok thanks- so it's a trick around the simulation then? Looking at it I didn't think @Corvinus pulled this out of thin air so there had to be something behind it. But why a zero volt source? Perfectly good ground between two series sources right?..

hurz

11 years ago

You can go even further and remove all resistors and have just a single dc reference supply connected to positive input of opamp. I am not sure what the reason for this complicated left part of the circuit is, but probably its just the model of a other output circuit. Anyway, for the EC problem finding a stable operating point it is not importante

Corvinus

11 years ago

As i said dont mind of the voltage, see it as constant (its just out of an real application) ..and thank you very much hurz! I give it a try!

Corvinus

11 years ago

Now it works, with initial ground at Up! Thx!

hurz

11 years ago

You are welcome

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