How you can use a dual power supply to get both positive and negative voltage<BR> <java_applet

 code=Circuit
 height="310" width="500" 
 archive="Circuit.jar" 
 p1name="pause" p1value=20 
 p2name="startCircuit" p2value="PSU.txt" 
 p3name="startLabel"  p3value="Dual Power" 
 p4name="useFrame" p4value="false"

/> <BR>