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Forums
4hv.org :: Forums :: Projects
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Completed Plasma Speaker / Tweeter

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Steve Conner
Thu Mar 20 2008, 01:12PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
 		It's 400 now mistrust
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Experimentonomen
Thu Mar 20 2008, 02:16PM
Experimentonomen Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
 		I got it off ebay, just like 7 modern ones, 7 identical ones.
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Richard
Thu Mar 20 2008, 02:49PM
Richard Registered Member #1211 Joined: Fri Jan 04 2008, 11:20AM
Location: England - UK
Posts: 19
 		Great looking flyback that !!! - I wish I could get my hands on one.

We have a problem here in the UK now, in that all domestic electrical waste (TV's microwaves & anything remotley useful to us), goes for recycling. At one time you could buy the odd TV/VCR for parts, from your local tip, but not anymore. It's all piled up & shipped away somewhere. Really frustrating when you see an old Philips G8 TV, that you know has a really good 30KV AC flyback in it...

Still, such is 'progress'

Thanks 4 the suggestion of Katie Melua - have to agree though Richie, a fast track IS more entertaining :)
I'll connect up the RGB LED sequencer later & try to post another video later today.
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uzzors2k
Thu Mar 20 2008, 05:50PM
uzzors2k Registered Member #95 Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
 		Crystal clear sound! Did you use frequency or pulse-width modulation?
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bob golding
Thu Mar 20 2008, 11:10PM
bob golding Registered Member #1084 Joined: Mon Oct 29 2007, 08:58PM
Location:
Posts: 28
 		hi richard,
yes the new WEE regs are a pain. i got about 80 microwaves and dismantled them before the new regs came in. didnt have enough room to do all the tv,s as well:-)) one way of getting useful parts is the freecycle network. if you join your local group and ask for old tv,s and microwaves you will get them,and they are free. nice project,been on my list for while but havent got around to it yet.

bob
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Richard
Fri Mar 21 2008, 06:21PM
Richard Registered Member #1211 Joined: Fri Jan 04 2008, 11:20AM
Location: England - UK
Posts: 19
 		Many thanks for the info on the freecycle network - nearest is Birmingham - just too far to make it worth while :(

Got another video uploaded HERE with the RGB LED backlighting/sequencer working.

Now considering trying to wind my own transformer to try & improve the top end frequency response.
It falls off at 12Khz on the scope - commercial ion plasma tweeters can acheive 50+kHz

@Uzzors : I'm using FM modulation in the videos shown, but the board can be configured for PWM as well.
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Experimentonomen
Fri Mar 21 2008, 08:27PM
Experimentonomen Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
 		That is due to the system beeing aircored and oscillating at several MHz. Ferrite cores are limited to around 100KHz.
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Richard
Fri Mar 21 2008, 09:36PM
Richard Registered Member #1211 Joined: Fri Jan 04 2008, 11:20AM
Location: England - UK
Posts: 19
 		Absolutley ! - I've found above 115kz (with the ferrite material flybacks use), the output drops suddenly.

The commercial units all use RF air-cored transformers and sizeable horns, to acheive a decent volume.

Perhaps an electrode-based disharge with an air-cored transformer might be the way forward ?

The large modulated TC's I've seen, do perform OK, but seem to produce a great deal of corona noise....
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GeordieBoy
Tue Mar 25 2008, 01:31PM
GeordieBoy Registered Member #1232 Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
 		> Got another video uploaded HERE with the RGB LED backlighting/sequencer working.

Wicked - Nice one! Haven't heard that tune in a while either!
Sarah Cracknall is a babe cheesey

-Richie,
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Dr. Dark Current
Tue Mar 25 2008, 09:48PM
Dr. Dark Current Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
Richard wrote ...


@Uzzors : I'm using FM modulation in the videos shown, but the board can be configured for PWM as well.
Ok, so how is it done? Do you feed your input signal to the frequency timing resistor pin of the IC or where?

Oh, and one more question, is it push-pull or bridge drive?
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