simulation of 555 astable mode

[Electricman2K5]

Does anyone know of a program (free!!-downloadable) which I can use to simulate 555 timer in astable mode- I also want to use it to simulate frequency modulation via an input to the control pin 5- I want to see the square waves produced.

ive tried Orcad 9.1 Pspice and I couldn't get it to work

Thanks

 

[Roff]

SwitcherCAD from Linear Technology is a totally free, uncastrated simulator. It comes with a model of the 555, and I believe it has 555 simulation examples to get you started.

 

[gastonanthony]

try multisim, its free, it already has 555 configurations ready to be dragged and dropped and to be connected to any circuit, it also has oscilloscope, wattmeter, volt/ohm/ammeter, and many more test instruments; and it contains almost all electronic components. It's very user-friendly(drag and drop style). The oscilloscope is very nice, you can choose time per division etc. Just google it. I remember that it is a bit large, about 163MB, but it's worth the trouble. if you don't have broadband connection for fast downloading, find a friend who does! because this software is really great!