TL081 10 watt amplifier

I found this schematic online. Tried to do a simulation on it but does not simulate correctly.

https://www.circuitlab.com/editor/#?id=z486hr

by KyleOgden
June 07, 2014

Well I don't know what you are trying to do but you have the bottom left node labeled -15v but it is connedted to ground.

by Garrett
June 07, 2014

thanks for mentioning that I put that ground in there the last time I tried to simulate it. Took the ground out now but still does not simulate right.

https://www.circuitlab.com/editor/#?id=z486hr

by KyleOgden
June 07, 2014

@KyleOgden,

Your updated circuit as posted at the time of writing this has only a floating 15V supply.

You need a second 15V supply for the negative rail. Connect it in series with and below V1 and then connect a ground between V1 and the new voltage source so you get a +15V and a -15V supply with respect to ground.

by signality
June 07, 2014

That makes a lot of sense. I'm going to make the corrections. Thanks, Kyle https://www.circuitlab.com/editor/#?id=z486hr

by KyleOgden
June 07, 2014

Oh, your circuit will not simulate in CL.

It relies on the Darlingtons monitoring the current through the supply pins of the opamp.

CL opamps do not model supply current:

https://www.circuitlab.com/forums/analog-design/topic/haj996zm/inverting-opamp-strange-results/#comment_5919

Sorry, I completely forgot about this.

by signality
June 10, 2014

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