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Forums
4hv.org :: Forums :: Tesla Coils
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Minibrute Construction Thread / FAQs

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HV Enthusiast
Sat Apr 26 2008, 10:41PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		Look at the schematic. Use the value specified in there.
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Wirenut
Sat Apr 26 2008, 11:48PM
Wirenut Registered Member #141 Joined: Sat Feb 11 2006, 01:14PM
Location: Southern California
Posts: 96
 		The link on your site for the schematic goes instead to the block diagram. BTW, I'm ordering my xenosonic board and parts this week.
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Austin
Sun Apr 27 2008, 03:21AM
Austin Registered Member #1169 Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
 		digikey mailed me the wrong cap for c12. I went to fry's electronics and bought a .47uF mylar film cap 100v this should work just fine right?
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HV Enthusiast
Sun Apr 27 2008, 04:21AM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		R56 should be 100k. This is the hysteresis on the comparator to prevent chattering.

C12 will work if its a 100V cap, but can't say it will fit in the 0.200" spaced holes.
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Dr. Shark
Sun Apr 27 2008, 12:11PM
Dr. Shark Registered Member #75 Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
Dr. Shock wrote ...

Yep, this definitely will help.
I can run my electrodes 1 foot apart from each other at maximum PW and maximum PRF with super hot white arcs with no problems at full voltage this way. The extension cord acts as a poor man's inductive ballast to limit peak current.

Well, does it?
You are coiling both the live and the ground return around the same path, so effectively you have two coils wound in opposite directions. The magnetic fields should pretty much cancel.
Or are you just running the cable in a straight line and relying on the distance between the live and neutral conductor to provide the inductance? In that case I suppose a small air core coil on the input of the power board could provide the same inductance and would do the job much more efficiently.
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...
Sun Apr 27 2008, 03:42PM
... Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
 		I am also a little skeptical about that, since there is probably much more than 50f of wire between the outlet and the main breaker panel... The only thing I can think of would be that you are using a cheep (small sized wire) extension cord which does have a significant resistance. 100ft of 16awg wire is .5oh, 100ft of 14awg wire is .25ohm.
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Dr. Drone
Sun Apr 27 2008, 05:04PM
Dr. Drone Registered Member #290 Joined: Mon Mar 06 2006, 08:24PM
Location:
Posts: 1673
 		shades
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HV Enthusiast
Sun Apr 27 2008, 07:30PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Dr. Spark wrote ...

Would just turning the variac down a bit do the same thing? confused
Cheers,
Ch

Turning down the variac would reduce current, but at the expense of performance. During normal operation (no ground strikes), the DC bus charges up nominally between pulses. However, during a ground strike, a lot of energy is discharged from
DC bus and hence the ballasting effect limits DC bus recharge and acts like an active ballast.

And yes, i agree based on the little inductance in the power cord that it is likely more resistive based ballasting.
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Austin
Sun Apr 27 2008, 08:10PM
Austin Registered Member #1169 Joined: Wed Dec 12 2007, 09:16AM
Location: Portland OR
Posts: 251
 		will TC7662ACPA work instead of ICL7662CPA-ND for U5. Because Digikey no longer sells ICL7662CPA-ND.
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HV Enthusiast
Sun Apr 27 2008, 09:55PM
HV Enthusiast Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
 		Get the ICL7662 via free samples from MAXIM.
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