| ID: | 4232 |
| From: | Evan Foss <ev...@gmail.com> |
| Date: | Mon, 29 Jun 2020 17:40:41 -0500 |
| Subject: | Re: [pcb-rnd] Off topic (maybe) - Spice simulator |
| in-reply-to: | 4231 from Robin Laing <Me...@TelusPlanet.net> |
| replies: | 4248 from Robin Laing <Me...@TelusPlanet.net> |
Hi Robin, I understand. COVID-19 has me effectively locked out of our lab. I guess I am lucky in that I at least have a pile of test equipment to use. I ask about the experimental setup because it's easy for students to mess up without realizing it on experimental setup. Tektronix CRT oscilloscopes have a common fault of turning off with a pop because the older flyback output cables can have moisture in their insulation which can arc through without leaving much of a mark to see with the naked eye. I could see an experimental setup designed to arc having this issue. I used multisim in college and actually it's predecessor Electronics WorkBench in middle school. It's ok but I wish they published more complete errata for all the models and the spice engine. Evan Evan On Mon, Jun 29, 2020 at 5:18 PM Robin Laing <MeSat@telusplanet.net> wrote: > > Hello, Evan, > > I really don't know what the setup is. I do know that it is to generate > a timed, high energy pulse but due to COVID-19 and working at home, I am > not deeply involved in that phase of the project. It is in the hands of > an engineer (Not Electronics). > > Some discussion was brought up about simulation issues in Multisim in a > teleconference and I thought I would ask the list. From teleconference > today, information that members of this group provided have been helpful > but I don't know in what way. > > Robin > > > On 26/06/2020 15:27, Evan Foss wrote: > > What does your experimental setup look like? I am picturing something > > like a digital version of Tesla's lab in NY. > > > > On Fri, Jun 26, 2020 at 3:46 PM Robin Laing <MeSat@telusplanet.net> wrote: > >> > >> On 24/06/2020 13:48, gene glick wrote: > >>> Ok, I see your point and I agree. I was just trying to get a 1st order > >>> approximation for the simulator. > >>> > >>> In my experience, and probably originally preached by Bob Pease, don't > >>> get lost in the simulator. Get close enough, then build it. > >>> > >>> You can spend a lifetime trying to get an exact response from > >>> simulation... trying to work out everything virtually... only to find in > >>> the real world that it behaves a lot different. > >>> > >>> Spice takes a long time to run. Dumb down your circuits enough to get > >>> at the most important stuff... then prototype it. > >> > >> I wish I could beat this into some peoples brains. They expect models > >> to be perfect all the time. > >> > >> I have been told that if the model isn't working, then we have to look > >> at different tools to model it better. I think that is part of the > >> issue in this case. Simulation says one thing, real world says > >> something else. In our case, the real world is the problem and we do > >> need to be closer to the simulation. I am thinking that the real world > >> is related to the way that the circuit was constructed as a big part to > >> the issues. > >> > >> Robin > >> > >> > >> > > > > > > > -- > Save money, use Open Source Software. > > Free Office Suite at > http://www.libreoffice.org > > -- https://github.com/evanfoss -----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v2 mQENBFYy4RYBCAC183JomLtbdAlcKiaPDoVHq52LDmVmH75aiEc69m7YxDt54/ai VtYCAobbGVIyn3Hlz3uhF6LnPl/6Lm1VdnCfpwu3KQhCO6ds10ow2C30X4ohCqOd hCVg5C+ILmQkEffFrFODy3ji+PYTF4pADvHCWsTMv0hf0llwFOJsBCK6cl02IffE JPqy4PjM1nZ9HpzT84JBaG/4OGvTZ8SQ2yFUl265jagvygPTf88H1xpZHH1r8dB1 stjUHLmPH8AOyDgKxFchgGeDc3p/vJtgDDIXAFfDXG0NSRovLmtaQdGxe47Zf/go bXiEM7YL2WqQe5zfEA919JxkEwlDKYniOSVzABEBAAG0N0V2YW4gRm9zcyAoVGhp cyBpcyBteSBwdWJsaWMga2V5LikgPGV2YW5mb3NzQGdtYWlsLmNvbT6JATkEEwEC ACMFAlYy4RYCGwMHCwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRCIpQTcE8nN bbBaCACAm8pU5lG1ev2Fsw68Axtcl57SJrYieqX96c3YuYH9JpqMqJRnd9nDKw9X tQuvuH7tUk0VbOaDqReOYJVI/4c5wb9AaOFp6K2DUcupq6XhgXpvz3HzoPwjAdIj XuQzdRUx5+innTJrSkGuBYW/CZ2zqEx4xfLlq4rO0hoTUMR8QVp2cCrkw6BT0m86 APIw/ZnjoxM8IEzr7MxfRIg3qpzrZk28rmhx+k78Jyk61UhwcCPGIm/pjUopTwYJ 3YBdRB2cYD2aN7A1JVf5cRmSQYooHBGpH0kYvomGk97PKqypVuJ7OpG9xM58wUcC qUVt9hKlePLzP8csYjt8onqI7qIIuQENBFYy4RYBCADlH8spG3WkCx62vB5mr5Z0 SCDd/RcyA4A5y5EOj5KurQkrSWpgi9Ho1yKruMJ6blQR2qkc66KqH9pnXDm/ZI1M K/wdW3ngETxBmXoozzFMT89aEWIVR5/PFodWK1elekE9iJxACuR98Zg2QttTD3x8 A9w8VEyMLOXcDTrPFpHegMKswFBg5iuMulAdXAoGejWTI3n+qKFpabHm2Lfs6wjk 5rjucpTdeFK6UeWF1xAvNxXibuu5BlGwv53930qIXRwO/Gn2Rh5DXWxKU2fEIme/ xgQQmIsDeUoWbfybdjw/x7Q0LW4mINiLDQcGHHRQKFIxbAJCT3USPLGh5xwE9/Er ABEBAAGJAR8EGAECAAkFAlYy4RYCGwwACgkQiKUE3BPJzW0uYAf9Hf30n8tM3mR2 Zo6ESE0ivgdgjaJtAWrBUx7JzAzPjBnBOlNnu5Y9lVEqetvUPH6e3PvaHYUuaUU8 0HwxuKBW9nUprgV6uIu1DZmlcp+SxpbuCy7RDpNocRLNWWFMaYYzznmTgfnTgD4D gCq8Mf1mcfrluTkOAo+QNqbMfl1GISClopRqxVuAo59ewgMnFujwgd8w12BwWl24 CzqOs5HqcUslePj+LzcjSNgVCklYwKl+0dsb/fctMOCtHodwqm2CBJ+zydvNmYkD fxda/J91Z1xrah5ec++FL0L4vs+jCiIWJeupJFKlr1hCMZiiGH7W554loK5l4jv3 EY347EidAw== =Ta4p -----END PGP PUBLIC KEY BLOCK-----
Reply subtree:
4232 Re: [pcb-rnd] Off topic (maybe) - Spice simulator from Evan Foss <ev...@gmail.com>
4248 Re: [pcb-rnd] Off topic (maybe) - Spice simulator from Robin Laing <Me...@TelusPlanet.net>