another circuit simulator question - Electronic Circuits Projects Diagrams Free

jrz126 · 6th January 2005, 09:43 PM

Does anyone know of a circuit simulator that is very easy to use and can simulate a lm3915 VU meter IC?

I'm trying to do some simulations for the LED's in my roof, so I need to simulate 8 74hc299 shift registers, a LM3915, and a couple of 555 timers
and how can I simulate an audio/music signal?

Thanks for your help.

pop · 6th January 2005, 10:37 PM

I've just checked my pspice (9.2) and EWB (5.12) versions and they don't have this model.
But, I found this website which has a LM3915 model for switchercad III
http://stephane.poujouly.free.fr/scad.htm

As I have never used switchercad (All I know that it is free for download from http://www.linear.com/), I can't tell you how easy is it to use or if it already has a built in LM3915 circuit model.

As for simulating audio signal, I don't think that anything short of Matlab's Simulink can do a good job. Although, one suggestion would be to consider creating a lookup table that contains audio amplitude and do a transient simulation on it. I know that pspice allows you to create these lookup tables (I am not sure what is the max size of table that it can handle though) through their ABM parts list.

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6th January 2005, 09:43 PM	(permalink)
jrz126	another circuit simulator question Does anyone know of a circuit simulator that is very easy to use and can simulate a lm3915 VU meter IC? I'm trying to do some simulations for the LED's in my roof, so I need to simulate 8 74hc299 shift registers, a LM3915, and a couple of 555 timers and how can I simulate an audio/music signal? Thanks for your help. __________________ Jeff Zimmerman To the optimist, the glass is half full. To the pessimist, the glass is half empty. To the engineer, the glass is twice as big as it needs to be.

6th January 2005, 10:37 PM	(permalink)
pop	I've just checked my pspice (9.2) and EWB (5.12) versions and they don't have this model. But, I found this website which has a LM3915 model for switchercad III http://stephane.poujouly.free.fr/scad.htm As I have never used switchercad (All I know that it is free for download from http://www.linear.com/), I can't tell you how easy is it to use or if it already has a built in LM3915 circuit model. As for simulating audio signal, I don't think that anything short of Matlab's Simulink can do a good job. Although, one suggestion would be to consider creating a lookup table that contains audio amplitude and do a transient simulation on it. I know that pspice allows you to create these lookup tables (I am not sure what is the max size of table that it can handle though) through their ABM parts list.