hi. i need a free circuit design and simulation software. can anyone suggest me one please.

 

Have a look at Switcher Cad. There is also another thread that you should keep your eye on. Clicky.

Mike.

 

pspice works good.

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"Everything that is done in the world is done by hope." -Martin Luther
"There are two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."-Albert Einstein

 

I've used PSPICE for a few years and was recently introduced to a program called LTSpice - I really like it.

 

Just to jump in and make a quick note that LTSpice and SwitcherCad are the same program. Linear provides it for free along with a ton of their power supply IC models, and even a whole pile of ready-to-go schematic jigs. I've never actually used it to design a switching power supply but I've done a couple of linear supplies using it. It's also constantly updated and new models are added all the time.


Torben

 

Learn something new every day!

 

Also, you can add models from other vendors, create new symbols, etc.

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Ron

 

my college has multi sim. its awesome. unfortunately, its paid.

 

Yeah, and even make your own models if you can get a grip on the various parameters. I haven't gotten that far yet but luckily I haven't needed to.

I keep finding other things you can do with it, such as frequency responses, THD analysis, adding formulaic traces to the plot panes, plot power by Alt-clicking a component, plot temperature if the model supports it, and so on.

At first glance it looks like a really simple little program but I've found over time that it is capable of far more than I am (yet).


Torben