Is this a bug

181

03:39:20

Why can Everycircuit compute no solution for this circuit? Is it a bug? Or am I doing something wrong? This should be a simple linear voltage regulator. Simulating it in LTSpice works. So where's the problem?

published 11 years ago

anthonyzakhia

11 years ago

put the negative of the amplifier even on ground

helron

11 years ago

You need to put an higher voltage on the opamp's + pin and a resistance between the exit and the transistor's base ;)

acpcalin

11 years ago

@helron well that kinda works... It only works if I start with a voltage greater than 9v at the negative pin of the op-amp. Then, I can lower the voltage to whatever value I want. But I cannot start the simulation with a voltage lower than 9v at the negative input

craiganddog

11 years ago

This should work just fine. It is a bug in the simulation engine.

helron

11 years ago

Yep I think there is a problem with the op amp model in this software nothing else. I can't see the problem otherwise ^^"

acpcalin

11 years ago

Well, that clears it. I wonder how and where I can fill a bug report?

cjdelphi

11 years ago

Just remove a track and insert a switch then flip the switch to start it

Voltransistor

11 years ago

Put a switch in from the 3.3v source and the non-inverted input and start it with opened.

Voltransistor

11 years ago

Or you can leave your switch opened.

jose1979

11 years ago

Conecta directo a tierra la entrada negativa del a.op.

Sine_eyed

11 years ago

Yep, with a switch from 3.3V and inverting input straight to ground, circuit is regulating nicely. I wonder where that bug ran off too?...

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