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Old 22nd December 2002, 06:49 AM   #1
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overmind's Avatar
Join Date: Feb 2002
Location: Singapore
Default Need help with Spice simulation

Need help with P-spice simulation

I am in the process of tweaking my Pioneer CDP. I want to make the machine sounds brighter and looking to alter the analog output/filter stage of the CDP. I am trying to simulate the analog output/filter stage of the player with Protel DXP and have encountered some problems.

The circuit of the output stage is as below. V1- V4 are the output of the DAC chip for one channel. A transistor connection to the point between R19 & C7 for DEMP, these are not shown.

While activating the simulation, I encountered Syntax error with one line of the netlist. The simulation would not proceed.

This is the first time I am using a simulation software, I do not know what is going on. Please advise me.

I attach the Advanced Schematic Binary(.schdoc) and the netlist(.nsx) files.

The error is at the line 99 of the netlist file: BEGND 99 0 V=0.5*V(3)+0.5*V(4)

The program, Protel DXP, can also save the schematic in other format such as Advanced Schematic ascii(.sch.doc), Schematic binary(.sch), Orcad schematic (.sch) and a few other. Please let me know if you need this.

The files are zipped up:

Click the image to open in full size.
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Old 22nd December 2002, 02:16 PM   #2
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Join Date: May 2002
Location: The great city of Turnhout, BE
Blog Entries: 8
Default spice

For soem reason your picture is shown as an icon only, I cannot open it (maybe something wrong with my settings?)
Also, the geocities page is unavailable - I get an error saying so.

Nevertheless - what is begng? Seems to be a voltage controlled voltage source. Maybe your version of spice uses another syntax for a vcvs, you may want to check that. What exactly is the error msg?

Jan Didden
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Old 22nd December 2002, 05:08 PM   #3
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Default Thanks. Problem solved (NT)

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Old 23rd December 2002, 03:07 PM   #4
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Join Date: Nov 2002
Location: Netherlands

If you are new to PSpice download a free student edition of Microcap7 from or

This is an integrated schematic editor and simulator that can simulate up to 50 components. It is one of the easiest to use real PSpice packages I have seen. Also get a good textbook about PSpice.

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Old 23rd December 2002, 04:58 PM   #5
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