I have used the LM-324 op amp for several things here over the years exactly because of its ability to operate from a single power supply, namely +9 volts DC and GND.
---- Original Message ---- From: "gregebert" <gregeb...@hotmail.com> Sent: 4/5/2021 7:29:22 PM To: "neonixie-l" <neonixie-l@googlegroups.com> Subject: Re: [neonixie-l] LM-324 op amp If the loop-gain is sufficiently low, any non-linearities at the output will get self-corrected (because of the negative feedback) at low-frequency. If the signal frequency is high-enough, or if there is low-bandwidth in the feedback network, then the output will definitely behave differently than you would expect due to the frequency response of the OP-amp (or your feedback network, such as an RC filter that isn't properly designed). This is where SPICE simulations are imperative. I wont use an OP-amp unless the manufacturer provides a SPICE model. On Monday, April 5, 2021 at 2:53:16 PM UTC-7 Terry Bowman wrote: On Apr 1, 2021, at 8:52 AM, chuckrr <chu...@all2easy.net> wrote: Doing do on an LM-324 runs the output at around 7.45 volts when the chip is operating from a single 9 volt supply. This reminds me of an aspect of the LM324 worth including in this thread. It's the kind of real-world issue that doesn't come up until the second or third chapter of an operational amplifiers textbook. I doubt that it's a concern for the original poster but I'm a bit hazy on details myself so I'm hoping that someone else can remind me. The LM324 is capable of working reliably on both bipolar and single power supplies. This versatility combined with its low price makes it a good all-around choice for a wide variety of less critical applications. A friend of mine, someone much cleverer than I'll ever be, ran into what he assumed to be limitation imposed by its single supply capability. He was designing a circuit with a bipolar PS and simply couldn't get the 324 to behave. IIRC, he told me that there's glitch that occurs when the output crosses zero volts while slewing from negative to positive. He ended up using something else, problem solved. Has anyone else heard of this? Terry Bowman, KA4HJH "The Mac Doctor" https://www.astarcloseup.com/ “...the book said something astonishing, a very big thought. The stars, it said, were suns but very far away. The Sun was a star but close up.”—Carl Sagan, "The Backbone Of Night", Cosmos, 1980 -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/3df4f407-a98c-49ed-ba7b-9faa6759dcf7n%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/202104060752987.SM817005%40ADT-IM1.