James skrev:
Snippage:I also don't seem to understand the sidac specs. I think the half wayvalue is a good start. I was looking on Mouser and I think this is what we need.P3002ac pins 1&3 280-360v adv 320v P3602ac pins 1&3 340-440v adv 390vP4202ac pins 1&3 380-500v adv 440v P4802ac pins 1&3 440-600v adv 520v It would appear to me that we need P3002ac. The breakover should be 320v. Three in series will be 960v. Is that going to be too high for the transistor? Are we going to have to use two different part numbers? I suppose one 3002 and one 4802 equal 840v. That should be ok for the transistor. From Mouser the 3002's are $2.05 each; minimum quantity 295. Sooo I need enough sidac's to load about 12 modules. This would have been 36 of the F3000K1's. Later, James ______________________________________
James,I have found in the past, that measuring brings the definitive answer, that`s why I ordered the whole assortment, that is, the ones that are in stock. The surface mounts are the way to go in the future, only one part is not in stock.
I will measure the breakdown voltage of the parts and report.The old ones that I still use were supposedly 250Volt types, but they break down at 270V, Not 269, not 271 I swear.
As far as breakdown of the whole string, I use 1080V with a 1200V CM600 and it works well. In a disruptive tank there really are no resonant peaks to take heed of, and since I use a DC resonant charging system, the final voltage on the cap is well under control, so I wouldn`t hesitate to go as high as 1160V or so...... I have my own reasons to want one single v ery low voltage sidac at the top of the string, but that is because I use a triggering scheme which becomes virtually transparent if the top sidac is ultra low voltage.
Also, the new types go as high as 700-800 volts, so 2 or 3 types should cover the whole spectrum.
Sidactors rock! Cheers, Finn Hammer _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla