Timeline for Why is my output not as expected? (Simple OpAmp Circuit)
Current License: CC BY-SA 4.0
18 events
| when toggle format | what | by | license | comment | |
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| Mar 29, 2020 at 22:00 | history | rollback | pipe |
Rollback to Revision 2
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| Mar 29, 2020 at 21:39 | history | became hot network question | |||
| Mar 29, 2020 at 21:00 | history | tweeted | twitter.com/StackElectronix/status/1244368744538832898 | ||
| Mar 29, 2020 at 14:50 | comment | added | Tom Kuschel | @Hearth ok, I see. | |
| Mar 29, 2020 at 14:49 | comment | added | Hearth | @TomKuschel That's a difference in notation between Europe and North America. A particularly frustrating one, if you ask me. | |
| Mar 29, 2020 at 14:46 | comment | added | Tom Kuschel | Why do the voltage arrows at the sources point upwards? In my opinion, it should be pointing down. Maybe you measure the voltage VCC2 and Vee in your graph. | |
| Mar 29, 2020 at 14:43 | history | edited | Justace Clutter | CC BY-SA 4.0 |
Added the solved flag
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| Mar 29, 2020 at 14:41 | vote | accept | Justace Clutter | ||
| Mar 29, 2020 at 14:41 | comment | added | Justace Clutter | Wait, got it. I needed to setup V4 as +5V because of the way I had it configured. So, am I mis-reading the NTE987 and it too should be getting a + and - bias voltage across pins 4 and 11? | |
| Mar 29, 2020 at 14:40 | comment | added | Justace Clutter | I thought that the LM324 created its own differential input and the V+ line got the magnitude of the differential voltage, while pin 11 went to ground. That is what the NTE987 was supposed to be configured as, I thought? Am I wrong here? | |
| Mar 29, 2020 at 14:38 | comment | added | Justace Clutter | I was doing that by setting V4 to -5V, but then the simulation fails to run with the error: doAnalyses: Too many iterations without convergence run simulation(s) aborted | |
| Mar 29, 2020 at 14:38 | comment | added | Andy aka | Why does V4 = 0 volts? | |
| Mar 29, 2020 at 14:36 | comment | added | Peter Smith | A couple of things; as the amplifier is inverting and it looks like you have a 0,.5V offset, it would swing around -2.5V. The negative supply is 0 so you cannot get the amplifier into the linear region. Try adding a -5V supply for V- | |
| Mar 29, 2020 at 14:08 | history | edited | Justace Clutter | CC BY-SA 4.0 |
Added updated output based on suggestions.
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| Mar 29, 2020 at 13:44 | comment | added | Vladimir Cravero | A simple answer for a very well written question. You get my +1! | |
| Mar 29, 2020 at 13:28 | comment | added | user16324 | check the opamp input connections! You built a comparator with LOTS of hysteresis, not an amplifier! | |
| Mar 29, 2020 at 13:28 | answer | added | Vladimir Cravero | timeline score: 6 | |
| Mar 29, 2020 at 13:24 | history | asked | Justace Clutter | CC BY-SA 4.0 |