Hi Woo,Dr. Jeff must be using a small cap size for the turns. This is an actual bipolar coil also, unlike what I think Kris is building. Dr. Jeff's bipolar is a nice little coil! I built one similar in size, although it was not used as a bipolar coil, but rather a hv source for a Seibt coil.
http://www.classictesla.com/seibt/Img_2870.jpgI've been wanting to turn this thing into a self-contained bipolar coil (however I need to replace the wooden primary runners with something else).
Take care, Bart dr.hankenstein@xxxxxxxxxxxxx wrote:
Kris, Here is a picture of Dr. Jeff's small bipolar coil: http://www.drspark.org/images/jeffbipolar/Dsc_0185.jpg If I recall correctly, he's using a 9kv / 30ma neon sign xfmr with a Sangamo mica transmitting capacitor and a 5-break stationary spark gap. Tuning doesn't seem to be very critical. Secondary is rather small, maybe 2" x 12" or so. Small coils are alot of fun! Woo
_______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla