[chinsettawong]

Well, the thickness of the diaphragm does of cause affect the frequencies response. It is known that the thickness of 6 microns or lower gives good FR. Anyway, the kitchen wrap can be stretched a lot, and by doing that, the thickness becomes less than its original 11 microns. I’ve try it when I use thicker spacers. It sounds very nice. The problem with it is that it is quite temperature sensitive. Wearing the headphones in a warm room tends to change the tension of the diaphragm somewhat and collapses the diaphragm to one side. But with thick spacers (0.8-1MM), it’s fine. It also gives very good bass too. Try it!

 

[legopart]

If the membrane have to absorb electric charge.
Maybe I can use some alominium foil for It

Somebody tried?

 

[chinsettawong]

If the membrane have to absorb electric charge.
Maybe I can use some alominium foil for It

Somebody tried?

Please. Please be careful. Please don’t play with high voltage and something that you do not really understand. It’s very dangerous.

 

[chinsettawong]

Today, I'm listening using my older generation of Omega clone. I actually put it aside for many years and almost forgot about it. Surprisingly, it still sounds very nice!

 

[legopart]

Again I ask,
How to decrease the Bias voltage (externally)?
which resistor to use?

 

[chinsettawong]

To decrease the bias voltage you have to make change from the internal not the external.

 

[legopart]

To decrease the bias voltage you have to make change from the internal not the external.

I want to connect old headphones with Bias of 180v to 230v amp.
I can buy and build any electronic board with any elements

 

[chinsettawong]

The bias voltages of 180V and 230V are only 50V apart. I’m sure you can just plug in your headphones with no problem.

By the way, what amp is it and what headphones are those?

 

[legopart]

The bias voltages of 180V and 230V are only 50V apart. I’m sure you can just plug in your headphones with no problem.

By the way, what amp is it and what headphones are those?

Stax Srm-1
and the headphones is Beyerdynamic Et1000

 

[bruma]

Stax Srm-1
and the headphones is Beyerdynamic Et1000

I use the ET1000 with a Stax Amp and it works fine. In fact it is better than the original Beyerdynamic N1000.

 

[legopart]

I use the ET1000 with a Stax Amp and it works fine. In fact it is better than the original Beyerdynamic N1000.

But will it have some future issues/ impacts with higher voltage then It set first?

 

[legopart]

About the DIY.
I ordered instead ready pcb one sided plated board with copper
like here https://www.ebay.com/itm/FR4-Copper...Na4TOtgBhDcV5nLJLA:rk:4:pf:0&var=423514493478

I bough some "Glass Fiber" boards
https://www.ebay.com/itm/Glass-Fibe...var=512414829651&_trksid=p2060353.m2749.l2648

And some "Copper Cu Metal Sheet Foil"
https://www.ebay.com/itm/99-9-Pure-..._trksid=p2060353.m2749.l2648&autorefresh=true

And now I asking myself, can I glue or cut this things to the right size?,
I need 86mm round shape

 

[bruma]

But will it have some future issues/ impacts with higher voltage then It set first?

no issues at all, works flawlessly for years

 

[lkos98]

@legopart
Interesting approach with copper foil. With 0.1mm thickness u may get a sturdy stators, but I'm not sure how you can glue it to the FR4, so it's flat enough. And then drilling and etching will be more difficult of course.
As for the bias - you can adjust it with a high Ohm resistor divider (5M / 50M will lower your voltage with about 1/10, but 230 is low enough, so I don't really think you have to lower it more.

 

[lkos98]

@chinsettawong
These phones are beautiful. What metal did you use for holding the cups (sorry, don't really know the therm)? Mines are 2.5 mm aluminium rods for welding. They are too soft, not elastic at all. Sometimes one side comes out of the hole and cup almost falls.