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4hv.org :: Forums :: Tesla Coils
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first tesla coil/questions

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aris
Fri May 28 2010, 04:07PM
aris Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81
 		DSCN0057

Is this circuit ok?I think to wire my one feedback coil as the picture....Also i think to use a thermal grease to cool the transistor this will be ok?!!!
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quicksilver
Fri May 28 2010, 04:18PM
quicksilver Registered Member #1408 Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
 		A 9V battery puts out less than an amp (it's a collection of smaller batteries within). Therefor I doubt that you'll have heat issues. I'm looking a an alkaline 9V & it is .850ma. Unless that arc was maintained for quite awhile I doubt that the transistor would heat to a problematic degree. Don't expect an arc over a centimeter & remember that the battery will wear rather quickly thus giving you less and less current, etc.
The above is fine for understanding the elements needed to utilize the flyback but as it is, I believe that you'll need to be satisfied with watching a mild, short, thin, blue arc. To drive a TC you'll need something a bit more robust. But you will learn that as a process by doing the above construction.
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ScotchTapeLord
Fri May 28 2010, 05:03PM
ScotchTapeLord Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
 		Maybe you could try to get hold of a sealed lead-acid battery. That's what I use for my flyback drivers. They can put out enough current and can be recharged, and it is only slightly higher voltage than a 9V.
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aris
Fri May 28 2010, 08:51PM
aris Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
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Posts: 81
 		Scothch how much amber output a sealed lead-acid battery?!!
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803
Fri May 28 2010, 09:28PM
803 Registered Member #2807 Joined: Fri Apr 16 2010, 08:10PM
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Posts: 191
 		well its a peak amp. in theory a car lead-acid battery can output 100s of amps, but the kind you find in flashlights, 10s
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ScotchTapeLord
Fri May 28 2010, 09:31PM
ScotchTapeLord Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635
 		I would guess it depends on the size of the battery. I've mostly used ones from alarm systems, which I believe were 7 Amp-Hours, meaning in theory that it would last an hour under a load drawing 7 Amps. I don't know for a fact that it is capable of reliably supplying 7 Amperes, but it probably can (with ease). I have probably drawn up to 3 or 4.
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Steve Conner
Sat May 29 2010, 10:01AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		Those SLA batteries can supply plenty of current. If you short one by accident, you can melt the insulation off the wires and burn yourself.

That is, assuming they're not old and worn out.
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aris
Sat May 29 2010, 01:05PM
aris Registered Member #2871 Joined: Sat May 22 2010, 06:50PM
Location:
Posts: 81
 		DSCN0058

This feedback coil is 4 turn of 22AWG wire...The wire is wedged on the ferrite core,there is any problem with this?


Also can i use thermal/heat paste(processor's one) for the transistor?
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803
Sat May 29 2010, 01:30PM
803 Registered Member #2807 Joined: Fri Apr 16 2010, 08:10PM
Location:
Posts: 191
 		yes, but why would you need it? you are not going to heat up the transsistors. We arn't known to be nice to semis or tubes:-D
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Mads Barnkob
Sat May 29 2010, 01:30PM
Mads Barnkob Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
aris wrote ...

DSCN0058

This feedback coil is 4 turn of 22AWG wire...The wire is wedged on the ferrite core,there is any problem with this?


Also can i use thermal/heat paste(processor's one) for the transistor?

Feedback winding is looking fine and normal thermal paste is good, there is no special transistor paste, and if there is, its not worth the money for our hobby :)
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