In the video.. the demo.. why are the tweeters turning OFF and ON all the time?
You better send that scope back to metrology for calibration! It's out by... 15 years now?
You better send that scope back to metrology for calibration! It's out by... 15 years now?
You must be referring to the points in the video where I blow them out so you can appreciate what they contribute to what you are hearing. Did you not understand that? 
Your second sentence is absurd. Better get yourself re-calibrated.
Your second sentence is absurd. Better get yourself re-calibrated.
Hmm... no I can not hear the difference over youTube... Mind you, I'm using a pair of Acoustic Energy AE1s and a Nuforce DDA100 DAC/amp so the sound is rather good but it is YouTube... I can not hear the difference in the treble in those short snippets.. hence my question. I thought maybe they were being shutdown to conserve Helium of something like that.
And, if you look at the picture of the scope in post #36 you see that the metrology tag shows the the calibration expired in Mar 2007.
I was joking about it.
But, I guess you don't get the joke?
Yikes.
And, if you look at the picture of the scope in post #36 you see that the metrology tag shows the the calibration expired in Mar 2007.
I was joking about it.
But, I guess you don't get the joke?
Yikes.
That photo did not come from me, but from Lampie519, so you can see why I did not understand your joke.
Yes, the sound quality is hopelessly poor. If you go to this very short YT link, then you get a better idea (no blowing it out there).
Yes, the sound quality is hopelessly poor. If you go to this very short YT link, then you get a better idea (no blowing it out there).
It sounds good... but ultimately, I'm listening to my AE1s via a Nuforce DDA100.
What makes the plasma tweeters specials is lost.
Given I've been reading about these things since the beginning... I recall an article in Audio/Stereo Review/High Fidelity back in the days.. plus many more on the Internet since... and given I live in SoCal.. I would hope to be able to hear them in person.
And, nope, there is no way in he!! I'm going anywhere near Chicago... sorry, no way.
What kind of amps are in there? I see the CJ preamp and there was what seems to be a CF2100 in there too. Good stuff.. but the amp can be bettered.
(Hint: I got a teflon cap'd CJ PV9, on active d uty, and I have a CF2100 amp in the closet).
What makes the plasma tweeters specials is lost.
Given I've been reading about these things since the beginning... I recall an article in Audio/Stereo Review/High Fidelity back in the days.. plus many more on the Internet since... and given I live in SoCal.. I would hope to be able to hear them in person.
And, nope, there is no way in he!! I'm going anywhere near Chicago... sorry, no way.
What kind of amps are in there? I see the CJ preamp and there was what seems to be a CF2100 in there too. Good stuff.. but the amp can be bettered.
(Hint: I got a teflon cap'd CJ PV9, on active d uty, and I have a CF2100 amp in the closet).
The recording was never meant to be any kind of demo at all - just better than a still picture and a description. AXPONA ended this past weekend, so recordings are all that's left.
The amps for the plasma are high voltage, low current class A - one per cathode. The rest of the equipment was provided by my dealer friend from Chicago.
The amps for the plasma are high voltage, low current class A - one per cathode. The rest of the equipment was provided by my dealer friend from Chicago.
( watching your BAF '22 video )...
Hmm.. how does the plasma create sound?
The plasma is created with a static current... and then the current gets modulated by the audio frequency?
That changes the heat transfer very rapidly and creates sound waves?
What is the minimum frequency it can generate?
Or is the plasma being modulated with an ultrasonic frequency and the audio frequency FM modulates that? That creates an ultrasonic frequency we can't hear and another one ( the change of the plasma basic modulation ) that is the high frequencies.
Neat stuff... you HAD some serious fun in there.
Hmm.. how does the plasma create sound?
The plasma is created with a static current... and then the current gets modulated by the audio frequency?
That changes the heat transfer very rapidly and creates sound waves?
What is the minimum frequency it can generate?
Or is the plasma being modulated with an ultrasonic frequency and the audio frequency FM modulates that? That creates an ultrasonic frequency we can't hear and another one ( the change of the plasma basic modulation ) that is the high frequencies.
Neat stuff... you HAD some serious fun in there.
Plasma.... I recall spending two months in Electro Magnetism going over those crazy equations... I forgot them as soon as the final went away... it was not required for my last exit exam to get my degree.
It sure would be nice to hear them...
Yep, us physics majors from the time sure had some serious fun. ;-D
It sure would be nice to hear them...
Yep, us physics majors from the time sure had some serious fun. ;-D
Last edited:
Modulating a dc current. Or you can create a plasma with RF and modulate it (different approaches).
http://www.plasmaspeaker.de/
http://www.roger-russell.com/ionovac/ionovac.htm
The plasmatronic patent.
It is actually good reading. Interestingly it is not the plasma equations derived from Maxwell, (*) but a combination of physical chemistry, some electro magnetism and control descriptions.... I got some more reading to do... The heat change and the gradient is the key, huh? Given a charge injector and a static plasma shape then a means to modulate the plasma was designed to create heat "pulses" within the surface of the plasma that generates sound waves.
http://hillplasmatronics.com/wp-content/uploads/2011/10/The-Patent.pdf
(*) I would have been lost if they got into atomic ionization, electron charges and protons/neutrons.
It is actually good reading. Interestingly it is not the plasma equations derived from Maxwell, (*) but a combination of physical chemistry, some electro magnetism and control descriptions.... I got some more reading to do... The heat change and the gradient is the key, huh? Given a charge injector and a static plasma shape then a means to modulate the plasma was designed to create heat "pulses" within the surface of the plasma that generates sound waves.
http://hillplasmatronics.com/wp-content/uploads/2011/10/The-Patent.pdf
(*) I would have been lost if they got into atomic ionization, electron charges and protons/neutrons.
Hello,
I would like to understand how the capacitor and resistors values of the voltage tripler values where chosen ,please.
I have understood that resistors are here to limit the inrush curent when capacitors are loaded.
But C11: 20uf ; C14 and C15 : 40uf, Why the values are different ?
At the negativ curent alternation : curent pass thought R8,R9,C14,R4 and load C11.
At the positiv curent alternation: curent pass thought R3 ,load C14.It pass too thought C11//(R3+R4) then R5 load C15 and the rest of the circuit.
Load seems to be different between both phases ...
Regards.
Attachments
Please do not share this dangerous circuit !! It has no galvanic insulation of the mains power. If you use a power transformer then the voltage doubler circuit is no longer required if the correct voltages are provided by this transformer.
Here only the audio transformer is providing isolation but wirking on this circuit is still leathal !
Here only the audio transformer is providing isolation but wirking on this circuit is still leathal !
I'm no safety officer, but I wouldn't delete it. Lampie's post is a good warning that this is a hot chassis circuit. Which is a bad way to design things as he said; and I agree with him. But all the TVs for decades were hot chassis designs and we have survived as a species despite it. It saves a ton of money to not put an isolating or step up transformer in, but as you are being electrocuted, you can ponder the money you saved...
Like all tube circuits, build at your own risk, and this one has another layer of risk.
Sheldon
Like all tube circuits, build at your own risk, and this one has another layer of risk.
Sheldon