WHERE IS THE LM566 IC

Hi mahesh411, Welcome to EasyEDA. You mean this? <http://pdf1.alldatasheet.com/datasheet-pdf/view/8985/NSC/LM566.html> It looks like no-one has yet made schematic symbol for the LM566. There also does not seem to be a readily available spice simulation model for this device. You can very easily make your own symbol for an LM566 using the Symbol Wizard: <https://easyeda.com/Doc/Tutorial/schematic.htm#SymbolWizard> or create a symbol from scratch: <https://easyeda.com/Doc/Tutorial/schematicLibs.htm#CreatingtheSchematicLibs> If you want to be able to simulate this device then please post back with some more information about what level of simulation accuracy you require from a spice model. Please tell us more about things like whether you need a simple model that just behaves like an idealised VCO with the same control characteristics as the LM566 or do you need a model that you can RC connect components to and a control voltage so that it behaves just like a real device. Do you care about the triangle wave slope linearity? Temperature dependence and so on. :)