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Beginner's question, please help - simulation

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Meini 7 years ago

Hi, I am just starting out with EasyEDA. This is probably quite simple, but I have tried to get this to work for hours. When I simulate this circuit, it simple doesn't oscillate as expected. What am I doing wrong here? Could someone please help me - I am stuck. [The project is here...https://easyeda.com/editor#id=6d0794adeb0c425d8457c9cf2e4f01fb][1] ![enter image description here][2] [1]: https://easyeda.com/editor#id=6d0794adeb0c425d8457c9cf2e4f01fb [2]: https://easyeda.com/normal/Simple_Oscillator-6d0794adeb0c425d8457c9cf2e4f01fb

Comments

andyfierman 7 years ago

You need to kick circuits like this into oscillation. Please see the section on `Initial Conditions` (starting up circuits) in: https://docs.google.com/document/u/1/d/1OWZVVFRAe_2NW3WratpkA_SGuHa5AcRow5ZRfvcoVTU/pub Please also see the post in Tips and Skill about how to find simulatable components in EasyEDA.

Meini 7 years ago

Thanks for pointing me in the right direction Andyfierman, I had a suspicion the "ideal" nature of the math behind it is what causes it. So I introduced an initial condition at C1 with .ic V(comp) = 0, but C! charges to V1/2 and the circuit goes back to a resting position. It is as if the OP Amp was broken. I did try and replace it and checked everything over. Thanks to you, I am a wiser than before but still not there yet... What do I miss?

andyfierman 7 years ago

The opamp you have chosen has no simulation model associated with it. Please use an opamp model from the library as described in: https://easyeda.com/forum/topic/How_to_find_simulatable_parts_in_EasyEDA-1YgasK2kC Or in the eBook referred to above.

Meini 7 years ago

Thank you so much for your help Andyfierman. Just another one of the beginner's traps I guess. Lesson for me: never assume, and read more... but I then again, when things appear to be obvious and intuitive, and when there is so much to read, this resolution is easily forgotten. :)

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