A Student's Attempt at the Plasmasonic Headphones. - diyAudio
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Old 6th August 2012, 10:57 AM   #1
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Default A Student's Attempt at the Plasmasonic Headphones.

@DIYAudio folks
I've been keeping this project log on another site but thought you guys may be interested as well so I decided to post it again here. As this project is on-going I'll keep both sides updated.

EDIT: The post won't show up properly here so here's the link to my original post:
http://www.head-fi.org/t/619661/a-st...nic-headphones

Last edited by b1o2r3i4s5; 6th August 2012 at 11:00 PM.
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Old 6th August 2012, 03:38 PM   #2
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to post images you have to use the feature in the "Advanced" (normal, not the fast reply at the end of the thread) version where it says manage attachments... or you can link to another website elsewhere.

_-_-bear

PS. What you show in the link (when cut and pasted) "http://i.imgur.com/mZSoO.jpg" is Gerald Shirley's Corona Wind Speaker, that can be seen in the JAES Loudspeakers I Anthology. It dates from the 50's. Doesn't work particularly well... and I would not suggest it for headphones.
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Last edited by bear; 6th August 2012 at 03:41 PM.
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Old 6th August 2012, 10:58 PM   #3
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Thanks, I guess I'll just link it back to my post on the other site.

I can see how this idea would not work as a speaker because the air pressure it could generate is very limited. My design is based on the Plasmasonic1 headphones (a few decades ago) and they claimed it to work, So I'm determined to test this out.
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Old 6th August 2012, 11:37 PM   #4
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sure you have a better shot at a headphone... but the size of the array will need to be fairly large, and you will also emit a huge amount of ozone in an enclosed space next to your ears... maybe not so good?

No need to run away...

Got a link to those headphones?
Was this a commercial product?

You might want to look into the Hill Plasmatronic loud speaker... a bit different, but similar...

anyhow you will need a large number of emitting points... to start to get sound...

_-_-bear
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Old 6th August 2012, 11:51 PM   #5
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Quote:
Originally Posted by bear View Post
sure you have a better shot at a headphone... but the size of the array will need to be fairly large, and you will also emit a huge amount of ozone in an enclosed space next to your ears... maybe not so good?

No need to run away...

Got a link to those headphones?
Was this a commercial product?

You might want to look into the Hill Plasmatronic loud speaker... a bit different, but similar...

anyhow you will need a large number of emitting points... to start to get sound...

_-_-bear
Yes, link to the Plasmasonic1 was in my original post.
but for your convenience: Plasmasonic
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Old 7th August 2012, 12:25 AM   #6
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Yeah, well you cheated, you went back and changed ur post!

_-_-bear
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Old 7th August 2012, 12:32 AM   #7
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Ok, now I see the link...

You should stop and take a moment to breathe and think.

The power supply you built is unsafe.

What you want is a multiplier that uses high voltage diodes and high voltage, low capacitance (like 2000pf or so) high voltage ceramic discs. The thing you have built is DEADLY.

DO NOT CONTINUE UNTIL YOU LEARN SOME MORE - Please.

Also the caps will blow out, since they can not handle the peak voltages they may see...

You will NEED some very high Megohm, high voltage rated resistors. You must use them. If for some reason you do not know what you need them for, that alone is enough of a reason to stop your experiment now.

The thing you have built is hyper dangerous as it stands.

You can make it safe, but this is not a trivial thing - your life is at risk at this voltage level with the current you can discharge from that supply (or so it seems, as it looks from the images - I didn't see a schematic, if you posted it).

Please take this seriously.

Thanks.

_-_-bear


PS. it is a worthwhile thing to try... but you have to know how to not kill urself in the process!
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Old 7th August 2012, 01:58 AM   #8
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Quote:
Originally Posted by bear View Post
Ok, now I see the link...

You should stop and take a moment to breathe and think.

The power supply you built is unsafe.

What you want is a multiplier that uses high voltage diodes and high voltage, low capacitance (like 2000pf or so) high voltage ceramic discs. The thing you have built is DEADLY.

DO NOT CONTINUE UNTIL YOU LEARN SOME MORE - Please.

Also the caps will blow out, since they can not handle the peak voltages they may see...

You will NEED some very high Megohm, high voltage rated resistors. You must use them. If for some reason you do not know what you need them for, that alone is enough of a reason to stop your experiment now.

The thing you have built is hyper dangerous as it stands.

You can make it safe, but this is not a trivial thing - your life is at risk at this voltage level with the current you can discharge from that supply (or so it seems, as it looks from the images - I didn't see a schematic, if you posted it).

Please take this seriously.

Thanks.

_-_-bear


PS. it is a worthwhile thing to try... but you have to know how to not kill urself in the process!
Alright Thanks.

The values of the capacitor and diodes were calculated as follows:
Max voltage of each capacitor is 110V * 1.414 * 2 = 311V
Used 400V capacitors and 1000V diodes.

The power supply is designed to have 1% ripple and 8% regulation @ full load.
Calculated capacitance is 29.xx F (Used 33F)

I AM actually aware that I need a resistor at the outputs to limit current because of the charge in the capacitors. That will be installed before I progress any further in this project.

But besides that I don't see anything wrong with the components, mind explaining a little?
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Old 7th August 2012, 02:52 AM   #9
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load?

what load??

ur supposed to be drawing microamps?

what happens when ur resistor fails or arcs or shorts?

As I said this is a dangerous project, and you've built a power supply that if discharged across you might well kill you instantly.

Others reading might wish to comment?

_-_-bear
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Old 7th August 2012, 02:57 AM   #10
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Quote:
Originally Posted by bear View Post
load?

what load??

ur supposed to be drawing microamps?

what happens when ur resistor fails or arcs or shorts?

As I said this is a dangerous project, and you've built a power supply that if discharged across you might well kill you instantly.

Others reading might wish to comment?

_-_-bear
The load is the amplifier which requires microamps to work.

I see your point, I'l put this on-hold until I learn more on the topic.
Thanks.
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