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My DIY electrostatic headphones - Page 173

post #2581 of 2595

The other pieces such headband and cases are made with my 3D printer and PLA plastic.

post #2582 of 2595

I cannot post yet photos.

post #2583 of 2595
Thread Starter 
Actually it's better that you save your photos somewhere else and post your links as images here. That's how I do mine.
post #2584 of 2595
post #2585 of 2595

That's a cool looking headband and surround! Some construction notes would be good.

And still a picture of your stretcher frame would be appreciated.

 

David.

 

Edited: Is the active area really 12.5cm? Or is it 12.5cm overall surround dia.


Edited by Muamp - Yesterday at 5:41 am
post #2586 of 2595
The diameter of membrane only are is 12.5 cm
post #2587 of 2595
Thread Starter 
That is huge! And you are using that with the spacer thickness of only 0.4 mm. It's really incredible that you still can get good bass. Is Mylar the material you use for the diaphragm?
post #2588 of 2595

yes it mylar 2micron from taiwan.

post #2589 of 2595
Thread Starter 

Hi ts8051,

 

I really don't know how you do it.  From the picture, you'r using single sided PCB for the stators.  You said earlier that your stator thickness is only 0.6 mm.  Do you use PCB that has a very thick layer of copper?  

 

For all my headphones, the maximum diameter of the active area is only 80 mm.  And yet, it's not so easy to tension the diaphragm on the 0.5 mm spacer so that it's stable and produce good bass.  

 

I only can guess that you are driving your headphones using a pair of step up transformers and the bias voltage is quite low too, right?

 

Please tell us.  How do you drive your headphones?  What is your bias voltage?

 

Wachara C.

post #2590 of 2595


The bias voltage is 580v as i use stax ergizer. the copper layer on stators is thick 80micron. After mylar tension and apply conductive material, I attach the spacer psb's on it with epoxy glue. Also I clean  with aceton the excess of glue in order to have a clean membrane attached to the spacer pcb. After 24 hours with a small soldering iron I remove the glued pcb's. Please note that in this stage because of high tension and low thickness of pcb's we observe a distortion. When I put these with other pcb's (stators and the other spacer with copper) the whole system is flat. The secret for success is tension and the quality of glue.

This is not the only ESL headphone is was constructed. Before this I constructed with the same method a rectangular in shape headphone with success.

Please note that I studing with experiments the ESL Construction from 1985 with i was a student in Physics and studied the N. Pollock article from wireless world magazine. 

post #2591 of 2595
Hi ts8051,

Could you please tell us where you purchase your FR4 @ 0.6mm with 80 micron copper. The thin fibreglass with such thick copper sounds like a good choice.

David.
post #2592 of 2595
Thread Starter 
I guess the spacer together with glue should make your total thickness of at least 0.6 mm already.

Have you compared your headphones loudness with other Stax headphones to see how much louder or softer your headphones are?
post #2593 of 2595
Hello,
My headphones are louder that my stax sr407, but sr407 is more musical.Now i am looking for the reasons caused it and then i will develop new designAlso i observed that my headphones are ply better with transistor based energizer rhan with my stax tube energizer. I suppose that this happens because of vey high capacity berween plates.
My other designed headphone rectungular in spape with total 20% lower active membrane surface plays better with my tube energizer. Possibly the stax tube energizer cannot accept very high capacity.
post #2594 of 2595
Quote:
Originally Posted by Muamp View Post

Hi ts8051,

Could you please tell us where you purchase your FR4 @ 0.6mm with 80 micron copper. The thin fibreglass with such thick copper sounds like a good choice.

David.

In Athens, Greece i ordered the pcbs based on my Design.
post #2595 of 2595

headphones2.jpg 250k .jpg file

 

My previous rectangular in shape ESL Headphone.
Active membrane dimensions: 76.2mm X 96.52cm)
Stator 0.6mm
Spacer 0.4mm 

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