Re: gEDA-user: problem to simulate an astable multivibrator with uA741 opamp

[joseda <josedaniel_martinez@xxxxxxxx>]

That was the trick! I fixed by adding a new voltage source of -15V (i called
Vee)

But why is not -Vcc the same as Vcc multiplied by -1?
Vcc is 15V so -Vcc should be -15 V but it doesn't work this way!!
Anyway, thanks!


You have a node named "-Vcc". You haven't attached this node to  
anything outside the opamp. Presumably you intended to attach a  
negative power supply. The opamp model contains a current source  
attached to this node, so letting it float makes rather high voltages.

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd@xxxxxxxxx


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