Hi Kking85743, Welcome to EasyEDA. Sorry but the green guy made it too easy for people to misuse the simulation tool and this was eating up all our server spacetime, so from Version 3.1 he has been banished. I have just added a spice symbol with associated subckt model and (vertical TO-220AB) PCB footprint for the Vishay IRF610. You can find it by doing **SHIFT+F** or **More Libraries...** then looking under: **System Components > Spice Dscrete** Or do **SHIFT+F** or **More Libraries...** and search for IRF610 and look for the symbol with the little `s` in it and these tags: `Spice Discrete; SpiceSymbol; subckt; NMOS` * We recommend that you read and play with the examples in the EasyEDA Simulation eBook at: https://docs.google.com/document/u/1/d/1OWZVVFRAe_2NW3WratpkA_SGuHa5AcRow5ZRfvcoVTU/pub Please also see: https://easyeda.com/Doc/Tutorial/new-v-4.1.1.htm and the second post in: https://easyeda.com/forum/topic/How_to_find_simulatable_parts_in_EasyEDA-1YgasK2kC

Thanks. I'd dug around using a search engine and found how to add .sbckt, and had done so. From the results, we probably used the same data. Thanks for the assist. Much rather have a functional item in the library than a pile of text notes on my drawings.

New question - the capacitance for the IRF610 is listed for 1MHz, but I'm operating at audio frequencies, where the capacitance is much less (about 10% of full value). This difference results in circuits that refuse to stop oscilating or have other problems. How do I add a part AND the associated .model or .subckt for local use (just for me, so as not to clutter up the rest of the stream - there are plenty of modified versions of the )? I see you added a part with the spice stuff, so I know it can be done, but I can't seem to find a way to do it, even after trying the referenced pages (some of which didn't work the way I expected, always a problem with a growing software platform). Please advise.

Just use the IRF610 that I put in the library and let the model take care of how the device is being used in your circuit. Here's why. `the capacitance for the IRF610 is listed for 1MHz` I don't know which of the various device capacitances given in the device datasheet you are referring to but that capacitance will vary with the device operating point. The reference to 1MHz is just because that is the frequency (in some sort of test jig) at which it/they were measured for reference purposes. You need to understand that simulating devices is a non-trivial task. A spice model for a device attempts to accurately model all the device parasitics over the whole of the device operating region that you may be using it in. The symbol and model I have put in the library uses the device manufacturer's best effort at an accurate device model. Unless you understand exactly what each parameter in a .model (and in devices used in a .subckt model) represents, don't be tempted to play about editing them. This is because most device models are not simple mappings of datasheet parametetrs but are based on physical models so parameters that may look like datasheet parameters are often not and they are very often dynamic. Changing model parameters can result in completely unrealistic device behaviour in a simulation. If you really want to play about with other models then you need to read: **Device Models** https://docs.google.com/document/u/1/d/1OWZVVFRAe_2NW3WratpkA_SGuHa5AcRow5ZRfvcoVTU/pub#h.43ky6rz including the references to other documents and lecture notes in that chapter.

Hey, I encountered the same problem with the 5A ACS712 from Allegro and the TI's ADS1220 chip, there are no SPICE models for either of these. Can anyone help?

There are no ADC models available in EasyEDA and in general there are no spice models available for ADCs. For background please see: https://easyeda.com/forum/topic/ADC_modells-7x3lfxP7o and: https://easyeda.com/forum/topic/MCP3008_simulation_model-LlfxrJpjB For the 5A ACS712 from Allegro, it may be possible to create a behavioural model but it depends on how accurately you need to model the device. The simplest model is a Current Controlled Voltage Source (CCVS) or a B Source configured as one. More detailed modelling is possible but obviously is more complex to do.