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-   -   plasma tweeters (http://www.diyaudio.com/forums/planars-exotics/18221-plasma-tweeters.html)

luke.ellis 26th July 2003 04:38 PM

plasma tweeters
 
Dose anybody in the uk have any experience building or useing these, anybody have simple schematics or details of component suppliers?
Many thanks
luke

Hybrid fourdoor 27th July 2003 08:49 AM

Been here yet?

http://www.plasmatweeter.de/

Timn8ter 27th July 2003 03:07 PM

I don't have any experience with it but as I was reading the info I was reminded of Tesla. Then I read it incorporates a Tesla coil. Figures. This kind of thing was right up his alley. Didn't he set his home town on fire once?

SY 27th July 2003 03:38 PM

Hybrid, thanks for the link. This is truly clever and innovative diy, but DEFINITELY not for beginners!

faustian bargin 27th July 2003 04:00 PM

there was an article in audioXpress a few months ago detailing a plasma tweeter project as well.

planet10 27th July 2003 08:09 PM

A recent audioXpress had an article on plasma tweeters. Warning, they involve very high voltages.

dave

NotInTheMafia 18th November 2003 05:03 AM

I have built the old version of his plasmatweeter, I used the circuit found at http://www.ece.villanova.edu/~cdanjo/plasma.html

So far just one is built, but the second one should be done soon. It sounds good, and is decently loud, i have to use a seperate amp set @ a much higher volume to get an acceptable volume level out of it. Even just using 1 tweeter makes a difference in the sound, my stereo sounds much better with it.

However it is a little bit trickey to get the bugs out of it. The coil is crytical. If you use a wire guage too small it will overheat and melt the coil form, or glue. For testing purposes im using black 35mm film canisters as coil forms. the wire i believe is #22awg, it is black enameled and came from the primary of a car ignition coil.
If the coil is wound wrong and does not resonate @ the correct frequency your tube will overheat and can get ruined. If the gain is set too high the tube will fry.
To set the gain, warm up the tube filliments for ~1.5 - 2 min but leave the high voltafge off. Turn the gain all the way down. Play music into the tweeter at normal listening level. Turn on the high voltage, and turn up the gain just untill the tweeter ignites by itself. Then turn the gain down just a tiny bit.

Turn off HV and let it sit for a minute. Then turn on the hv again and the tweeter should ignite by itself. it it dosent raise the gain a tiny bit. Keep an eye on the tube to make sure that the plates dont start to glow orange. If it runs for a few min without the plates getting too hot then its all set, and you shouldnt need to play around with the gain anymore.

NotInTheMafia 18th November 2003 05:06 AM

Its not too hard to build the tweeters actualy,its just dangerous if you dont know any HV safety.

luke.ellis 18th November 2003 09:21 AM

Dont think i'll have a problem weith the coil. I have some ceramic bar i am planing to lathe down to the right size and drill out. i have had problems however with finding the right components from uk suppliers, this may be because i am not an expert and am simply looking for parts as they are listed on the schemtic from the site above. if anybody has a simple list of parts required etc.... a friend made a pair with me about a year ago and the sound was fantastic but he brought most of the stuff back from hols in the states and we had to run them on a 110volt stepdown transformer. They also genarate a massive amount of interferance to a plasma screen tv making it unwatchable whilst they ran. the hi-fi was fine however so i suspect this may be solved by a better case as ours lived in plastic boxes to insulate some of that nasty high voltage.

roddyama 18th November 2003 10:55 AM

Check out this thread and watch out for the ozone.
http://www.diyaudio.com/forums/showt...841&highlight=


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