Index: simulation/raw/06_passive_ac.html
===================================================================
--- simulation/raw/06_passive_ac.html	(revision 7926)
+++ simulation/raw/06_passive_ac.html	(revision 7927)
@@ -5,12 +5,12 @@
 <h2> Scope </h2>
 <p>
 In this simulation we are going to look at how a multi-stage RC filter behaves
-when stimulated with different frequency sine waves.
+when stimulated with sine waves of various frequencies.
 
 <h2> The schematics </h2>
 <p>
-The single-sheet schematics contains the filter, the voltage source and
-spice command symbol.
+The single-sheet schematic contains the filter, the voltage source and
+the spice command symbol.
 <p>
 <center>
 <a href="06_passive_ac.rs"><img src="06_passive_ac.svg" width=400px></a>
@@ -19,8 +19,8 @@
 
 <h2> SPICE: what an ac simulation is </h2>
 <p>
-In the ac analysis the simulation a DC solution is calculated first
-then a small signal sinusoidal stimulus is applied over a range of
+In the ac analysis simulation a DC solution is calculated first
+and then a small signal sinusoidal stimulus is applied over a range of
 frequencies. The result is typically a graph with frequency on the X axis
 and gain or phase on the Y axis. The AC analysis is often used to get
 a transfer function.
@@ -29,7 +29,7 @@
 
 <h3> V1 </h3>
 <p>
-In our example, V1 specifies an 1V AC signal with a DC component of 0V
+In our example, V1 specifies a 1V AC signal with a DC component of 0V
 on the <i>in</I> network. The syntax for this is (see in V1's spice/params):
 <pre>
 dc 0 ac 1
@@ -57,16 +57,16 @@
 <p>
 The first line instructs spice to do the "ac analysis" in decade variation
 mode (dec 10), to get a decade logarithmic output with 10 points in each
-decade. It then specifies the range of interest for frequencies: anything
-between 1 Hz and 100 kHz.
+decade. It then specifies the range of interest for the frequencies:
+anything between 1 Hz and 100 kHz.
 <p>
 Then come three plots. The first is the output voltage in decibels, on
-a logarithmic Y scale. Then the phase shift of the circuit, in radian
-and converted to degrees.
+a logarithmic Y scale, then the phase shift of the circuit, both in radians
+and in degrees.
 
 <h2> Export and run ngspice </h2>
 <p>
-Because of the plot commands the output is a set of drawing (if ngspice is ran
+Because of the plot commands the output is a set of drawings (if ngspice is run
 on X): three graphs with one curve each.
 <p>
 <img src="06_passive_ac1.png">
@@ -86,12 +86,12 @@
 ac dec 10 1 1000k > plot.txt
 </pre>
 <p>
-After the export, write a single word <b>spice</b> in the first line of the
-file (e.g. using a text editor), else gnucap won't know the file is in spice
+After the export, write the single word <b>spice</b> in the first line of the
+file (e.g. using a text editor), otherwise gnucap won't know the file is in spice
 syntax. Then run <i>gnucap 06_passive_ac.cir</i> and it will dump a text
-table to plot.txt that can be plotted using e.g. gnuplot.
+table to plot.txt that can be plotted using a suitable utility, e.g. gnuplot.
 <p>
-The <a href="gnucap/06_passive_ac.rs">gnucap-modified schematics is also available.</a>
+The <a href="gnucap/06_passive_ac.rs">gnucap-modified schematic is also available.</a>