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Raytraced image of two jack plugs, one mono, the other stereo. Numbers on details added, and image cropped afterwards in a graphics software package.
Numbers indicate:

1. Sleeve - usually ground
2. Ring - Right-hand channel for stereo signals, negative phase for balanced mono signals, power supply for power-requiring mono signal sources
3. Tip - Left-hand channel for stereo signals, positive phase for balanced mono signals, signal line for unbalanced mono signals
4. Isolating rings

Rendered with POV-Ray (see http://www.povray.org/) - below is the scene description for this image

 /*  ======================================  "Jack"- or "Tip-ring-sleeve"-type plug  --------------------------------------  Created by Søren Peo Pedersen - see my  user page at  http://da.wikipedia.org/wiki/Bruger:Peo  ======================================  */    #declare Metallic=texture {   // Texture for      pigment {color rgb .3}    // metallic parts      finish {                  // of the jacks          reflection .7          phong 1          phong_size 60          ambient .5          diffuse .5          metallic          }      }    #declare Isolator=texture {   // Texture for insu-      pigment {color rgb 0}     // lator between tip,      finish {                  // ring, and sleeve          reflection .5          phong 1          phong_size 20          }      }    #declare Spotty=pigment {     // Spotty pigment          bozo                  // for surroundings,          color_map {           // to enhance the              [0 color rgb 0]   // reflective parts              [1 color rgb 1]   // of the plugs              }          scale .3          }    sky_sphere {                  // Make for "surroundings"      pigment {          gradient y          pigment_map {              [0.0 color rgb 1.0]              [0.12 color rgb 1.0]              [0.2 Spotty]              [1.0 Spotty]              }          translate <0,-.5,0>          scale 2                      rotate <-90,0,0>          }      }    #macro Jack_plug(StereoFlag)  // Common macro for mono & stereo plug    union {             // Cable extending from    sphere_sweep {    // rear end of the plugs      cubic_spline,5,      <0,100,0>,2.7      <0,-40,0>,2.7      <20,-90,-10>,2.7      <-0,-240,-40>,2.7      <-0,-290,-90>,2.7            pigment {color rgb .5}      finish {        ambient .5        diffuse .5        }      }            // Conical "sleeve" where the cable enters the jack:      cone {<0,-24.5,0>,5,<0,-40,0>,3 pigment {color rgb .5}}      torus {3,1 translate <0,-40,0> pigment {color rgb .5}}            // Cylindrical, dark "body"      cylinder {<0,-24.5,0>,<0,-24,0>,5.5 texture {Isolator pigment {color rgb .2}}}      torus {5.5,.5 translate <0,-24,0> texture {Isolator pigment {color rgb .2}}}      cylinder {<0,-1,0>,<0,-24,0>,6 texture {Isolator pigment {color rgb .2}}}      torus {5.5,.5 translate <0,-1,0> texture {Isolator pigment {color rgb .2}}}            cone {0,4.5,<0,-.5,0>,5.5 texture {Metallic}} // Metal "base" of plug            cylinder {<0,0,0>,<0,   // "Sleeve" part of the plug        #if(StereoFlag !=0) 15.3 #else 21.2 #end        ,0>,3.1        texture {Metallic}        }            #if (StereoFlag != 0) // If rendering the stereo (3-way) version:        cylinder {<0,15.3,0>,<0,16.3,0>,3.1 texture {Isolator}}   // Add an extra, narrow isolator        cylinder {<0,16.3,0>,<0,21.2,0>,3.1 texture {Metallic}}   // and the ring      #end            cylinder {<0,21.2,0>,<0,22.8,0>,3.1 texture {Isolator}}       // Wide isolator      // Cylindrical section right behind the tip:      cylinder {<0,22.8,0>,<0,23.5066144,0>,3.1 texture {Metallic}}            merge {   // The tip with "neck" and conical end          cone {<0,31.2,0>,0.8,<0,27.7156,0>,3.0111}          torus {2.5,.6 translate <0,27.4,0>}          cone {<0,23.6,0>,0.8,<0,27.0844,0>,3.0111}                    difference {              cylinder {0,<0,1.638,0>,2.866144}              torus {2.866144,1.066144 translate <0,1.066144,0>}              translate <0,23.8,0>                                  }          torus {2.8066144,0.2933856 translate <0,23.5066144,0>}                    texture {Metallic}          }      }    #end  // End of macro    // Show a mono and a stereo jack:  #object {Jack_plug(1) rotate <0,-20,0> rotate <-40,0,-100> translate <0,11,0>}  #object {Jack_plug(0) rotate <0,20,0> rotate <-40,0,-100> translate <0,-8,0>}    light_source {<-10000,5000,-10000> color rgb 2}              camera {location <0,0,-80> look_at <0,0,0> angle 50} 

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