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Bennem

Mon Feb 18 2008, 07:52AM

Registered Member #154 Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260

Austin wrote ...

Also does the polarity matter for the current sense transformers? Ie does it matter which way the 8awg cord goes through the hole of those two transformers that hook up to the resonant board?

Correct feedback phasing is important.
When you come to apply buss volts and nothing seems to oscillate,
try reversing your CT connections or reversing the direction of your wire into the CT hole,
either will give you the required 180 degree shift in feedback phasing.

Mel.

Austin

Tue Feb 19 2008, 08:01AM

Registered Member #1169 Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251

I don't suppose anyone has an "advanced modulator board" laying around that they want to sell me? Dan is fresh out and wont have them for another 8 weeks or so.... If this is true than I may be stuck for a while unless I follow the schematic and solder up my own PCB board.

This sucks too because I just ordered all the parts from digikey.com and the total was over $100

Wirenut

Tue Feb 19 2008, 02:26PM

Registered Member #141 Joined: Sat Feb 11 2006, 01:14PM
Location: Southern California
Posts: 96

You could build the basic version of the interrupter - much easier until you get the adv. mod. board

HV Enthusiast

Tue Feb 19 2008, 03:01PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068

Regarding toroids, Science First of NY also sells toroids. I believe they have an 8x2 and a 12x3 which are pretty inexpensive. They don't list them in their catalog, but if you call them, they will place the order for you.

Search GOOGLE for their website and give them a call.

Austin

Wed Feb 20 2008, 03:17AM

Registered Member #1169 Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251

Anders. M has an extra modulator board laying around that he is willing to sell so I am back in business! See kids, when in doubt it never hurts to ask.

I really want a professionally spun secondary, does anyone on this form or anyone you guys know do custom secondaries? perhaps you or your friend would like some extra cash? If so let me know via private message or other means.

he are some updated pictures

I hope these are well insulated. I had trouble finding nylon stand offs so I used this type of plastic that separates the two screws (one on top/one on bottom) from touching each other.

I am starting to regret this layout just because I don't like how the capacitors are facing the MMC... I just have so little space tho.

Wirenut

Wed Feb 20 2008, 04:01AM

Registered Member #141 Joined: Sat Feb 11 2006, 01:14PM
Location: Southern California
Posts: 96

I really want a professionally spun secondary,

Really? Why? I like winding secondary coils. It's really not that difficult to get a good looking secondary. I wound mine in less than half an hour with only minor prep. and a friend's help to pull the trigger on the drill to spin the form. Besides, don't you want to be able to show off your coil and tell people that you built all of it including winding the coils?

I just have so little space tho.

Ahh, the rat's nest inside my base should make a little more sense now...
Just wait until you wire the fan, add the relay, CT's, LV transformer, bridge and control power wires, etc.

teravolt

Wed Feb 20 2008, 05:33AM

Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111

another place for spun toroids is information unlimited

CT2

Wed Feb 20 2008, 06:27AM

Registered Member #180 Joined: Thu Feb 16 2006, 02:12AM
Location: Ontario, Canada
Posts: 187

As to spinning the secondary, if you want it to look professional, just take your time. I wound this coil today sitting in front of my computer watching south park... it only took like 4 epeidodes. I wound it by hand, and it was 36 awg wire... it's a PITA, but for other coils I have built a winding jig and that really helps. It isn't too hard to get a great looking secondary and you can say you made it.

Bennem

Wed Feb 20 2008, 07:09AM

Registered Member #154 Joined: Sun Feb 12 2006, 04:28PM
Location: Westmidlands, UK
Posts: 260

teravolt wrote ...

another place for spun toroids is information unlimited

I personally wouldn't recommend buying toroids from Information Unlimited IMHO.
I ordered two (a 12x3 inch and a 8x2) and both
arrived dented,knicked and scratched, one had a small extra hole at the side of it
and both halves of the toroids were not a good fit.
I have had one of John F toroids and they are excellent!... second to none in comparison!

Mel.

Austin

Thu Feb 21 2008, 07:30AM

Registered Member #1169 Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251

More pictures. I'm a bit concerned about the designed layout but I feel its a bit to late to change it. Let me know if you guys think this layout might cause any foreseeable problems with induction etc. my biggest concern right now is how close the MMC and big caps are to each other.

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