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sharpie7 / circuitjs1

Electronic Circuit Simulator in the Browser
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Op-Amps: Problem with non-inverting / follower amplifier #457

Closed Roger-Hlls closed 3 years ago

Roger-Hlls commented 4 years ago

Hi all!

I've made the "e1_3_3.txt" circuit as a non-inverting op-amp amplifier and the "e1_3_4.txt" one as an op-amp follower. I based my circuits on the LM741 model; however, the y don't seem to work correctly, not in a real-life circuit on the Lab with the same components. More specifically, the output has a 180o phase distortion! I also tried othe op-amp models with the same results. Any ideas?

Roger-Hlls e1_3_3.txt e1_3_4.txt

pfalstad commented 4 years ago

I think it's working, it's just that the input source is upside down. The * side is the positive side, and should be on top. If you look closely at color of the wires you can see that the input to the op-amp and the output are in phase. But the scope is showing it reversed because the polarity is reversed.

Roger-Hlls commented 4 years ago

Thank you very much Paul!

            However, since I’m using the MS-Windows version, I tell you I cannot see the “*” my friend... Is there a bug? On the other hand, you took a lot of stress out of me! Many thanks again,

Roger-Hlls

From: Paul Falstad [mailto:notifications@github.com] Sent: Friday, July 03, 2020 9:57 PM To: sharpie7/circuitjs1 Cc: Roger-Hlls; Author Subject: Re: [sharpie7/circuitjs1] Op-Amps: Problem with non-inverting / follower amplifier (#457)

I think it's working, it's just that the input source is upside down. The * side is the positive side, and should be on top. If you look closely at color of the wires you can see that the input to the op-amp and the output are in phase. But the scope is showing it reversed because the polarity is reversed.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/sharpie7/circuitjs1/issues/457#issuecomment-653651187 , or unsubscribe https://github.com/notifications/unsubscribe-auth/AQB5CR54NKVIB5LP5A5YWS3RZYSYJANCNFSM4OPWCC5Q . https://github.com/notifications/beacon/AQB5CR7YMCCZIA6CZHKRRA3RZYSYJA5CNFSM4OPWCC52YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOE326Z4Y.gif

pfalstad commented 4 years ago

I need to update the windows version with the * change.

Roger-Hlls commented 4 years ago

Dear Paul,

            Wonderful! Thank you again,

Roger-Hlls

P.S. I could send you my oscillator images of real-world “Electronics 101” circuits and the output of the simulator ones they don’t agree (e.g. output of a NAND ring oscillator). Are you interested?

From: Paul Falstad [mailto:notifications@github.com] Sent: Friday, July 03, 2020 10:25 PM To: sharpie7/circuitjs1 Cc: Roger-Hlls; Author Subject: Re: [sharpie7/circuitjs1] Op-Amps: Problem with non-inverting / follower amplifier (#457)

I need to update the windows version with the * change.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/sharpie7/circuitjs1/issues/457#issuecomment-653656676 , or unsubscribe https://github.com/notifications/unsubscribe-auth/AQB5CR7D3CHCPVXJFROLF3LRZYWBNANCNFSM4OPWCC5Q . https://github.com/notifications/beacon/AQB5CR7VEN36SVOOZTJRIJLRZYWBNA5CNFSM4OPWCC52YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOE33AEZA.gif