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My DIY electrostatic headphones - Page 90

post #1336 of 1610
I was just pulling your leg.

post #1337 of 1610
Originally Posted by wakibaki View Post

I was just pulling your leg.



I admit the idea of making a dielectric aluminum alloy is stupid. 

If one were so concerned about paramagnetism, would just use wood or plastic... 

Anyway, "quamquam ridentem dicere verum quid vetat?"

Edited by jgazal - 5/8/14 at 2:18pm
post #1338 of 1610
τὸν κρατοῦντα μαλθακῶς θεὸς πρόσωθεν εὐμενῶς προσδέρκεται.

post #1339 of 1610
 Anyway, "quamquam ridentem dicere verum quid vetat?"

"What prevents me from speaking the truth, though laughing?"


 τὸν κρατοῦντα μαλθακῶς θεὸς πρόσωθεν εὐμενῶς προσδέρκεται.

"God from afar looks graciously upon a gentle master"


I admit the idea of making a dielectric aluminum alloy is stupid. 

If one were so concerned about paramagnetism, would just use wood or plastic... 

The non-ubiquitous unobtanium would serve very well here.

post #1340 of 1610
Thread Starter 

I'm so glad to see wakibaki still active with his DIY.  :L3000:

post #1341 of 1610

Yes, I was a bit depressed for few weeks, but then you realise that you are still alive, and you still have to fill the remainder of your life, which is all any of us are doing anyway. What used to give meaning to my life still gives meaning to it, and although I build things to use, building is fun in itself.

I have built one side of the electrostatic headphones complete down to the cable and connector. The other side is just a little hand-fettling away.

Now I need an amplifier. I have completed the design work for the I solid state amplifier I talked about previously, with some small exceptions. I have designed a case to make on the cnc mill, it uses perspex and aluminium sheet. I ordered the wrong transformers, so I have not ordered the boards, because I always check the layout against the parts, because dimensions in data sheets can be hard to interpret. Building something like this is always quite stressful, because of the cost implications of a mistake, so I have a quick fix in mind.

I have bought a 15W (TPA20202024) amplifier and Meanwell 12V supply. I intend to build an EHT supply after the style of the one on Rod Elliott's site:- http://sound.westhost.com/project105.htm, and wire it up with a pair of centre-tapped transformers. I wonder if anybody would care to recommend some transformers for this service? I don't want to spend a lot, I just need something to prove the phones.


This is what I am thinking about:-


Edited by wakibaki - 5/10/14 at 11:02am
post #1342 of 1610

Just get a good NAD, Yamaha, Sansui, or Pioneer amp and a Stax SRD7/SB and you're good to go.

Or, you could build a KGSS, KGSSHV, BHSE or DIYT2.


Or, even buy a Stax SRM-252s or SRM-323s.

Edited by wink - 5/11/14 at 3:46am
post #1343 of 1610

Doh! I picked a tx with a CT secondary, when what is required is a CT primary. I must be a bit distracted.


Here is the latest iteration of the depletion MOSFET design. I have carefully made these stacking boards 100mm square, this is the best value/size on sites such as seeedstudio.com and iteadstudio.com. 10 ea. of these cost ~U$75.



The bottom layer, the amplifier, has a largely unbroken copper plane on the upper surface, the upper 2 layers have largely unbroken copper planes on their undersides. The power is supplied via vertical descenders as required locally by the amplifier. That's the theory anyway.



The schematic shows DN2540, but IXYS IXTP01N100D should be substituted for UK mains operation with ~650V bias available. I have all the parts excluding the transformers and boards. I have part-drawn an enclosure in 3D inAutocad:-



Dimensions are 5*5*4 interior. 2, 3 and 5mm acrylic and alu sheet.

This will enable me to figure the placement for the fasteners and controls. The back will be alu. plate to heatsink the active devices, the front smoked acrylic, to permit the digital bias voltage readout to be visible on the top shelf of the PCB stack. Top and bottom will have cooling slots. This has been designed to permit low-effort production on my CNC mill.



Edited by wakibaki - 5/11/14 at 10:18am
post #1344 of 1610

The centre-tapped primary is not a problem as long as the secondary is centre-tapped too.

post #1345 of 1610
Thread Starter 
I'm sure that Wakibaki knows what he's doing.
post #1346 of 1610

I found these:- http://www.ebay.co.uk/itm/Toroidal-230V-Mains-Transformer-15VA-0-6V-0-6V-/300976618233?pt=UK_BOI_Electrical_Test_Measurement_Equipment_ET&hash=item46139abaf9


In this case the primary and secondary swap roles, but this is dual both sides.


This is the bias supply:-





post #1347 of 1610
Thread Starter 

Guys!  Any progress on your headphones and amplifiers? 


I bought a roll of 2 microns Mylar from Ebay and put it on my Omega clone.  I like it.  The trick is to not stretch the Mylar too much - just enough to get rid of wrinkles.



Wachara C.

Edited by chinsettawong - 5/24/14 at 9:20am
post #1348 of 1610

does this count?

12ax7 / 5965 like post# 7

thanks for the update on the 2 microns Mylar....

its all I have to work with...good to know.


post #1349 of 1610

All the single sided planars got me thinking.. Has anyone experimented with single sided electrostats or perhaps making the sides facing your ears more acoustically transparent (smaller stator surface area)? 

post #1350 of 1610
I went to Malta for a week. I used to live there when I was 8~12 YO.

Some things arrived by the time I got back:-

These are the parts for the transformer-style amplifier I decided to take a flyer with. It's only ~8W into 8ohms, which is 8vrms, with a transformer ratio of 40, but I still think it should drive the phones.

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