Update README.md

README.md

-# speaker-plotting
+# Plotting membrane speakers
 
-project for wire plotting of membrane speakers.  for wildcard week in mas.836 2018
+Project for wire plotting of membrane speakers.  for wildcard week in mas.836 2018
 
-Sam Calisch
-Elena Chong
-Zijun Wei
-Victoria Shen?
+- Sam Calisch
+- Elena Chong
+- Zijun Wei
+- Victoria Shen?
 
+We will use a custom magnet wire plotting tool for the Zund cutter to plot coils for audio speakers.
 
 <img src="https://calischs.pages.cba.mit.edu/kiri-tww/img/flatcoil/flatcoil-40awg-small.mp4" width=600px>
 
-
 <img src="https://calischs.pages.cba.mit.edu/kiri-tww/img/flatcoil/flatcoil-40awg-microscope.jpg" height=250px>
 <img src="https://gitlab.cba.mit.edu/calischs/kiri-tww/raw/master/img/flatcoil/flatcoil-cut.jpg" height=250px>
 
+Two approaches: Coil-magnet, and coil-coil.
+
+The coil-magnet topology (planar magnetic) is used for some high end headphones.
+
+The coil-coil topology relies on coils to generate all magnetic fields, not just the time varying one.
+
 
 **Links:**