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Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Not to threadjack, but the metal cases ST diodes are more or less the standard (well, for singlemode fibers at least, you just don't use plastic and singlemode fiber in the same sentence even if you are just coupling into a photodiode) I think the opf472 is a pretty standard one, I found it at arrow ,1086,,00.html?
application=SEARCH&appid=nac&event=1020&docid=6915
74S4415407N3506 I am sure there are more out there, but it it might be cheeper to buy some old 10base-fx transceivers off ebay ( is 3 pairs for $25 )
Registered Member #347
Joined: Sat Mar 25 2006, 08:26AM
Location: Vancouver, Canada
Posts: 106
Thanks Steve!
I was just working on the coil tonight, I added more caps to the MMC to bring it up to 0.544uF 6kV. I also tested it out up to 400VDC bus voltage, no explosions this time Arcs reach 1m in length no problem, I now need a bigger space to run it in. I should get that change at Geek Day this weekend.
I also finished a PIC based interrupter. This one has can run the normal repetitive mode, as well as single shot with 1 to 7 bursts. I found that having a several bursts quickly in a row (~1.5-3ms apart) produces long "single shot" sparks, at least twice as long as just 1 burst.
Probably the most professional looking thing I've ever made.
Inside the interrupter. I had to squash everything into one corner of the board to leave room for the pots and switches.
The fiber receiver I used was OPF482, stocked at Digi-Key. It doesn't have a built in amplifier though, I had to add a comparator for that.
Registered Member #347
Joined: Sat Mar 25 2006, 08:26AM
Location: Vancouver, Canada
Posts: 106
I now have pretty much everything mounted in the coil base, save for the light-bulb-based bus cap discharger. The PFC appears to be working flawlessly. I haven't gotten a chance to measure the bus ripple yet, I need to figure out how to do that safely.
I brought the coil out into the garage and opened up the pulse width a little, performance seemed decent, getting 4.5' arcs while drawing 1kW from the mains. Still need to do some tuning with the new bigger toroid.
Registered Member #347
Joined: Sat Mar 25 2006, 08:26AM
Location: Vancouver, Canada
Posts: 106
I was finally able to run the coil outside and turn up the power. The ladder is 76" away from the breakout point in the photos below. The coil was pegging the 15A meter during these runs. Burst length was about 80-100uS.
Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
Very nice results for such a small coil. I'm glad to see that the multiple H-bridge approach works this well. How much current are you running through the primary in this outdoor run?
I'm planning to build a dual CM-300 H-bridge in my new coil. Would be nice to see how well this works with large IGBTs. Going to rebuild my current single H-bridge CM-300 coil for that.
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"MMI 1" - New DRSSTC
)
Arcs reach 1m in length no problem, I now need a bigger space to run it in. I should get that change at Geek Day this weekend.
