Plasmatweeter - Page 2 - diyAudio
Go Back   Home > Forums > Loudspeakers > Planars & Exotics

Planars & Exotics ESL's, planars, and alternative technologies

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 5th March 2007, 11:28 AM   #11
diyAudio Member
 
Join Date: Feb 2007
Silver burns together with tungsten, without music, 2A load
Click the image to open in full size.

15 sec. later
Click the image to open in full size.

Questions?
Thanks,
George
  Reply With Quote
Old 5th March 2007, 11:32 AM   #12
diyAudio Member
 
Join Date: Feb 2007
Well young, to everyone did ready?
  Reply With Quote
Old 5th March 2007, 12:27 PM   #13
diyAudio Member
 
Join Date: Feb 2007
Hello,
this is my second one, the left side one, this one is measured with 117.6db,
the ignition is not to see cause it´s too fast for the camera.
Click the image to open in full size.
This is the elder version without spark-plug, there is an old Hosehold-Fuse
sawed with an diamond-blade, also the diamond for the spark-plug.
The only danger if You get hurt by doing this work is to work without glasses and gloves!
The spark tip is made of two pieces, the tungsten tip and the iron nail on which is welded,
this item is about 2 cm long and easy to service, only once a month two times scrach
a little emery paper to do away the oxydation products. The tip will not burn away,
the first I made are still working about 7 jears.

Have a good time,
George
  Reply With Quote
Old 5th March 2007, 01:17 PM   #14
diyAudio Member
 
Join Date: Feb 2007
This sequence of the ignition is made july 2003,
it works automatic by measuring the HF-power, but sometimes it starts
suddenly by a loud signal, this is no further problem.
Click the image to open in full size.

Tis pic is made 2005, but the tweeter works til 2001 and the tip will still work if it needs no other design.

Click the image to open in full size.

The other one with the ignition was at this times my test-object.
My friend is a carpenter and the wodden-case is made of him, I may not scratch the polished shellac.




/George
  Reply With Quote
Old 5th March 2007, 06:24 PM   #15
diyAudio Member
 
Join Date: Feb 2007
that am smaller IClick the image to open in full size.
  Reply With Quote
Old 6th March 2007, 02:25 AM   #16
diyAudio Member
 
Join Date: Feb 2006
Location: Malaysia
Hi George,

Thank for sharing your work. and your kind explaination.

The pix and clips are excellent. Makes my blood boil! (no pun intended )

I am still trying to understand your posts, Google translation like to rearrange the phrases. Making it difficult to understand...

Your use of modified spark plugs as the "hot" section is a wonderfully brillient improvise! Everything is there!! and trouble free too!!!

And the auto start and starting device is cool.

Question
1) What is the function of Cx and how to adjust? can we just use a variable air gap capacitor used in radio tuning for Cx?

2) In your 117db set, did you meant you brazed the tungsten to the iron nail instead of welding? If brazed, will the plasma melt the joint?

The material used,
1) Must we use silver wire? and why?
2) Can we use copper or other metal to brace to the spark plug instead of tungsten?
3) the tungsten is lathe cutting tool bit?

Thousand Thanks

Ken
__________________
Audio_Idiot
  Reply With Quote
Old 6th March 2007, 08:57 AM   #17
diyAudio Member
 
Join Date: Feb 2007
Hi Ken,
thanks for your praise for the pictures, photograph makes for me large joy.
Your questions:
1.) the CX makes the feedback, together with the backplate electrode, since both is attached to the lattice of the tube. A variable air gap capacitor is not useful because the disk distance is much too small. My condenser consists of two sheet metals screwed on and firmly pressed are. Plumb bob melts place at these. Is very simple to manufacture. The adjustment is also seh simple, as in the pictures to see is, which has CX approx. 2cm ² surface and approx. 3mm disk distance. The distance of the point too the backplate electrode amounts to approx. 10-12 mm. Also which I not particularly critically, only with to large was not away will equivalent loud with all tones, becomes then also the inverse feedback adjusted by the G2, is simply, real.
2.) The point is from tungsten, 3.2mm diameter, an electrical welding electrode from the fitter, you must only make certain that you buy new, who has old a little radioactivity and that is unhealthy. Of it I cut approx. 6mm off and on a nail welded, that is, because one saws the nail down and thus a plug has that knows is replaceable, tungsten is not not flexible. To melts and broken there nothing goes.
3.) silver line brings more achievement to ca,10%.
4.) Copper cannot one use because it burns and oxidizes and comes then bad clay/tone. Tungsten is stable.

A small drop copper burns approx. 1 hour and more, it ��lights out��, remaining
somewhat grey cinder those musik then disturbs.
Therefore no copper electrodes.
Click the image to open in full size.
I hope that I you up to success to help can.
If my english is not enough I will write in german and You
look for the translation, but I think it work also now.

I would like to deal once briefly with the current supply.
That turns out needs 280-320 V of anode voltage with high river.
I have a bridge rectifier and a 250F condensers.
A transformer for the heating 40Volt 600mA.
A transformer 2x15Volt 20mA for the music primarily.
I do not use an anode transformer!
I show of it no connection diagram because it with us in D the regulations very expensive.
Before I you a power pack in addition draw still very long time will thus last.
310Volt anode, 40Volt heating, 2x15Volt, nevertheless everyone made.
I start the power pack with a TRIAC because the starting current the small power switches glue.
If it a transformer want to use so one … - 230Volt, 2A!
Straight ones do not run with me the old “Moody Blues” as ever belonged.
Many greetings,
George
  Reply With Quote
Old 6th March 2007, 11:38 AM   #18
diyAudio Member
 
Join Date: Feb 2007
Click the image to open in full size.


please do not forget thereby that it around to music-hear goes, therefore the whole work!
  Reply With Quote
Old 9th March 2007, 01:08 AM   #19
diyAudio Member
 
Join Date: Feb 2006
Location: Malaysia
Hi,
Took some time to study your latest posts.

Question on the Oscillator,
1) How does the curved plate work? and what material?
2) What is the input audio signal requirements? e.g. Maximum & minimum Peak to peak voltage?
3) Any difference in performance between "welded tungsten iron electrode" and "pressed tungsten iron electrode"?

For now, I am trying to source some tungsten electrode from local hardware stores in my nearest town... not as common as in Germany.

Cheers

Ken
__________________
Audio_Idiot
  Reply With Quote
Old 9th March 2007, 06:43 AM   #20
diyAudio Member
 
Join Date: Feb 2007
Hi, Ken
1) How does the curved plate work? and what material?

Do You mean this plate on the backside of the Reflector? This ist the Condensator Cx, made of iron
and welded or pressed a cable in. Only two pieces of 2-3 cm iron-plate, 0.5mm, and ca. 6mm away.
This part is necessarily and becomes very hot, together with the backplate electrode it makes the feedback.
To attitude: first make sure that the flame burns ca. 1cm high, then hear to it an vary the capacity
until it is the quietest and the highest. You can hear this if You have some "Sparks" in Your
current supply, otherwise give some quiet musik to him.

2) What is the input audio signal requirements? e.g. Maximum & minimum Peak to peak voltage?

The input is closed directly to the amplifier exit, thus to the existing loudspeaker. one can share also
for the advantage the existing frequency switch for the tweeter .
Minimum is CD-Output ca. 100mV,
maximum up to now 200Watt .

> 3) Any difference in performance between "welded tungsten iron electrode" and "pressed tungsten iron electrode"? <

Yes, there is some oxydation products after a few month between the tungsten and the iron in the pressed places.
I think that the power will become less therefor. This is because the glowing tungsten works like a catalyst
and there ist some new, light-green product on. This yo can scratch awy every three months.
You can also use iron for Your tries, 4mm nail will work surely long time enough.
Only You have the more the scratch.

Greetings,
George
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Plasmatweeter diy (germany?) hotlipswetpants Planars & Exotics 1 30th July 2004 04:18 PM


New To Site? Need Help?

All times are GMT. The time now is 10:58 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2