Hi Mommom, Welcome to EasyEDA. Your simulation is private so nobody but you can see it. Please see **Sharing** in the Tutorial. In the meanwhile I suspect the problem is that you have used parts that do not have simulation models associated with them. To help get you started using simulation in EasyEDA, please see: https://easyeda.com/forum/topic/How_to_find_simulatable_parts_and_run_a_simulation_in_EasyEDA-1YgasK2kC Please note however that there are no SMPS models available in EasyEDA. This is because it has so far proven too difficult to write or re-engineer existing models to run successfully in Ngspice within the the simulation limits of EasyEDA. :) If you need the extra simulation power I suggest you try LTSpice and then import the .asc schematic from the into EasyEDA when you are ready to finalise the schematic ready for PCB design and ordering from EasyEDA. We can help with your simulation in LTSpice if you need it. :)

Sorry about link to schematic. This is shared link: https://easyeda.com/mommom/smps_rcc-9b51b93a5edf462cb80fd3cc0c5c4d6b Please help me on EasyEDA, Because I don't know about LTSpice. Thank for your reply!

Ok, we can do this in EasyEDA because it is a simple discrete circuit. It's switch mode supplied with complex ICs that are hard to deal with. I'll get back to you.

While you're waiting please study the Simulation eBook. Thanks.

Thank for your guide, I will do it. I am looking forward for your sound. Thank you very much!

Please have a look at: https://easyeda.com/andyfierman/smps_rcc_copy-acb38904321743d3aecf7def43a6cbeb * Using spice symbols including newly added parts MMBT5551, IRF640 & MUR820. * Supply configured as step to kickstart the circuit. Sim now runs but does not do anything that looks like a switching supply. * Check transformer inductances and ratios. * Check schematic against original. Can you post a link to or upload an image and a circuit description of the original? * Check voltage ratings of parts vs. RAIL voltage.

Thank you very much! The based page is here: https://www.pocketmagic.net/simple-switched-power-supplies. and this is original schematic: ![enter image description here][1] As your suggestion, I tried this with LTSpice, and it work: ![enter image description here][2] I want to send LTC schematic to you, but I can not attach it here. I will do it if I have your email. LTS is true or not? as your knowlege Thank for your help. [1]: https://www.pocketmagic.net/wp-content/uploads/2012/05/simple_smps_3.png [2]: /editor/20170807/5987a53c0c178.PNG