Electronics > Beginners

how a noob blew up his opamp

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amateur_25:
I understand in a voltage follower configuration the opamp basically tries to keep both of it's inputs the same.

I have check my soldering and used a multimeter to buzz out the connnections to ensure it's right according to the schematic.   So the tlc082 was powered from 5v but I did wire up 12v to it's minus input. Is there a limit as to how much voltage I can put on the inputs?

Fungus:

--- Quote from: amateur_25 on January 04, 2019, 09:45:38 am ---Is there a limit as to how much voltage I can put on the inputs?

--- End quote ---

Yes.

amateur_25:
The spec am looking at is the common mode input voltage?

God damn it am shit at electronics. I am not good at small details

Time to get my hammer out  :horse:

mvs:

--- Quote from: amateur_25 on January 04, 2019, 10:20:36 am ---The spec am looking at is the common mode input voltage?

--- End quote ---
Yes, but you have also violated input voltage in absolute maximum ratings section:

Vi Input voltage (2)(4)   max. +/- 15V
(2) All voltage values, except differential voltages, are with respect to the midpoint between VCC+ and VCC−
(4) The magnitude of the input voltage must never exceed the magnitude of the supply voltage or 15 V, whichever is less.






 

Fungus:

--- Quote from: amateur_25 on January 04, 2019, 10:20:36 am ---The spec am looking at is the common mode input voltage?

--- End quote ---

In your case, Vdd is 5.0V so you can only apply between 0 and 5V to the inputs.


--- Quote from: amateur_25 on January 04, 2019, 10:20:36 am ---God damn it am shit at electronics. I am not good at small details

--- End quote ---

Recognizing that is a good start.

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