add reference to second prototype page

README.md

@@ -22,6 +22,8 @@ The 3D models currently include the TinySpHEAR, a four capsule first order Ambis
 
 * [TinySpHEAR](doc/TinySpHEAR_simple.md): four capsule first order microphone with simple stand mount
 
+* [TinySpHEAR Zapnspark](doc/TinySpHEAR_zapnspark.md): four capsule first order microphone with Zapnspark phantom power interfaces and shock mount
+
 * [Octathingy](): eight capsule microphone (proof of concept so far)
 
 * [BigSpHEAR_12 / BigSpHEAR_20](): 12 and 20 capsule designs (proof of concept)

doc/TinySpHEAR_zapnspark.md

@@ -3,13 +3,11 @@
 
 ## TinySpHEAR with Zapnspark interfaces
 
-The TinySpHEAR microphone is a traditional 4 capsule tetrahedral first order Ambisonics microphone. This improved design adds four printed circuit boards with Zapnspark phantom power interfaces housed in the microphone body. A trailing cable ends in four XLR connectors. 
+The TinySpHEAR microphone is a traditional 4 capsule tetrahedral first order Ambisonics microphone. This improved design adds four printed circuit boards with Zapnspark phantom power interfaces housed in the microphone body. A trailing cable ends in four XLR connectors. The picture shows the full design as previewed in OpenSCAD and a picture of the second prototype (built with Primo EM182 10mm capsules, 9.6mm microphone radius).
 
-The picture shows the full design as previewed in OpenSCAD and a picture of the second prototype (built with Primo EM182 10mm capsules, 9.6mm microphone radius). 
 
 <img src="pictures/TinySpHEAR_zapnspark.png" width="400">
 
-The 3D models also include a shock mount that clips into a standard microphone stand mount.
 
-The two main model files are tuned for ![EM182](TinySpHEAR_EM182.scad) (10mm) and ![EM200](TinySpHEAR_RM200.scad) (14mm) capsules. Uncomment the different "render_" lines to render different parts or the complete microphone assembly. 
+The 3D models also include a shock mount that clips into a standard microphone stand mount. The two main model files are tuned for ![EM182](./TinySpHEAR_EM182.scad "TinySpHEAR for 10mm EM182 capsules") (10mm) and ![EM200](./TinySpHEAR_RM200.scad "TinySpHEAR for EM200 capsules") (14mm) capsules. Uncomment the different "render_" lines to render different parts or the complete microphone assembly.