At 02:31 PM 9/1/2010, Olin Lathrop wrote: > > The problem is that I can't find any spark proving systems that don't > > rely on a UV sensor. > >How about a thermocouple in the flame? This is kind of a chicken and egg situation: They have to prove that=20 spark exists before they can open the fuel valves. In addition, this is a very FAST system - they can turn the flame on=20 and off in time with music beats. They tried a number of other ignition systems before settling on the=20 spark gap, including using a pilot light. The problem is that the=20 fuel velocity is so high that they weren't getting ignition on the=20 leading edge of the fuel stream. The current setup has the fuel stream pass exactly through the middle=20 of the spark gap. The spark is continuous and it raises the=20 temperature of the fuel up way past the fuel's flash point. The=20 result is perfect ignition. dwayne --=20 Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax www.trinity-electronics.com Custom Electronics Design and Manufacturing --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .