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Home-Made IEMs - Page 340

post #5086 of 5099

Thanks for all the info!

 

By the way as I am searching for drivers to buy on taobao and aliexpress including various DD, I found something interesting. 

 

After talking to various sellers, apparently there is a TWFK BA clone made by a chinese manufacturer that can be found on taobao named ..".domestic lou driver"...(lou is usualy the chinese name for knowles).

It goes for around 13$/piece, have the same sound characteristic and electric properties. I am pretty sure they are quite good but QC control and matching might not be on par...

Anyway just so you be aware. As far as I know most of Knowles driver that are sold in China are manufactured in Malaysia. These one are mad in China (I don't know the manufaturer yet).

IMO It might worth checking, I am also sure that many new DIY IEMS sold from China recently uses them.

 

 

On another somewhat related subject I have a question regarding wiring.

There is a variant TWFK numbered 31749 that have a cap already solderded to both of the positive pads

 

 

Now usually if I want to use both fk and wbfk part i need to solder a positive wire to both positive pads on the twfk and only one negative wire to the negative pads (as the negative are already connected) right?

 

But now I see that with the cap soldered, only one positive connection is made. Does it mean that the cap is working as an High pass Filter for both drivers of the caped TWFK and only one positive wire is necessary? Because a cap is an AC component in an AC circuit as long as both positive pads are connected only one wire is required to make the HPF work for both drivers?

I am a bit confused...


Edited by ForceMajeure - 7/22/16 at 10:59pm
post #5087 of 5099
From what i can in see in the picture the caped drivers must have another wire underneath the cap? Otherwise only the upper driver is connected at all and the cap will have no affect. If there is a wire underneath the cap, their both connected but only the lower will have a filter by the cap. ( hope im right ) Anyway that's what i can see from the picture.
post #5088 of 5099

Guys, those '' domestic lou's '' really exist. I already found some of them on taobao, and the seller said that they have permission of knowles to make the exactly same speaker with same sound and properties. I'm pretty curious to know if they actually sound the same as the real ones.

post #5089 of 5099
Quote:
Originally Posted by Pete64 View Post

From what i can in see in the picture the caped drivers must have another wire underneath the cap? Otherwise only the upper driver is connected at all and the cap will have no affect. If there is a wire underneath the cap, their both connected but only the lower will have a filter by the cap. ( hope im right ) Anyway that's what i can see from the picture.

Yes all TWFK have both negative pads connected by a small wire so you only need to solder one wire for the negative.

That is what I am trying to figure out what part of the TWFK actually benefit of this cap. 

maybe because a cap is an Alternative Current component both driver get the HP filter and only one positive wire need to be soldered to one positive pad.

post #5090 of 5099
Quote:
Originally Posted by ForceMajeure View Post
  Warning: Spoiler! (Click to show)

Thanks for all the info!

 

By the way as I am searching for drivers to buy on taobao and aliexpress including various DD, I found something interesting. 

 

After talking to various sellers, apparently there is a TWFK BA clone made by a chinese manufacturer that can be found on taobao named ..".domestic lou driver"...(lou is usualy the chinese name for knowles).

It goes for around 13$/piece, have the same sound characteristic and electric properties. I am pretty sure they are quite good but QC control and matching might not be on par...

Anyway just so you be aware. As far as I know most of Knowles driver that are sold in China are manufactured in Malaysia. These one are mad in China (I don't know the manufaturer yet).

IMO It might worth checking, I am also sure that many new DIY IEMS sold from China recently uses them.

 

 

On another somewhat related subject I have a question regarding wiring.

There is a variant TWFK numbered 31749 that have a cap already solderded to both of the positive pads

 

 

Now usually if I want to use both fk and wbfk part i need to solder a positive wire to both positive pads on the twfk and only one negative wire to the negative pads (as the negative are already connected) right?

 

But now I see that with the cap soldered, only one positive connection is made. Does it mean that the cap is working as an High pass Filter for both drivers of the caped TWFK and only one positive wire is necessary? Because a cap is an AC component in an AC circuit as long as both positive pads are connected only one wire is required to make the HPF work for both drivers?

I am a bit confused...

 

Drivers are made by comapny named Estron (different Estron) I posted measurments of both TWFK and those replicas some pages back.

 

RE TWFK31749 - there's a wire connecting both negative pads together under the cap.

Quote:
 Does it mean that the cap is working as an High pass Filter for both drivers of the caped TWFK and only one positive wire is necessary?

No, if you connect positive wire to woofer you'll get a high pass on tweeter, if you connect another cap before woofer you'll get 2nd order crossover on tweeter.


Edited by piotrus-g - 7/23/16 at 4:28am
post #5091 of 5099
Quote:
Originally Posted by piotrus-g View Post
 

Drivers are made by comapny named Estron (different Estron) I posted measurments of both TWFK and those replicas some pages back.

 

I remember something 

 

Ahh found it 

http://www.head-fi.org/t/430688/home-made-iems/4725#post_12589235

known as ESC210C30017. calsanmicro announced it 

there seem to be another company maybe the same company named as Shenzen estron called Shenzen Bellsing that have the same driver under the name BRC210C30017

This is the equivalent driver that Shenzen Estron have of various drivers

 

Estron Transducer Knowles Transducer Sonion Transducer
ESC330 Series FH Series N/A
ESC370 Series HC Series 2600 Series
ESC530 Sereis ED Series 2300 Series
ESC230 Series FJ Series N/A  
ESC210 Series TWFK Series N/A  
ESC305 Sereis WBFK Series N/A  
 

 

http://szestron.en.alibaba.com/product/60315777654-803344046/Dual_Balanced_Armature_Earphone_Driver_For_Armature_Headphones.html

http://bellsing.en.alibaba.com/productgrouplist-802844269/Receiver_Speaker.html

 

@piotrus-g Have you tried them?

post #5092 of 5099
Quote:
Originally Posted by piotrus-g View Post
 

No, if you connect positive wire to woofer you'll get a high pass on tweeter, if you connect another cap before woofer you'll get 2nd order crossover on tweeter.

So you say if I connect the twfk this way

 

The woofer will receive current and will act regularly and the FK (tweeter) will have a High Pass filter (if so that's what I thought at the beginning but got confused)

 

If I add another cap to the positive wire (above pic) then I will have 1st order HP filter for the woofer and a 2nd order HP filter to the tweeter?

post #5093 of 5099
Quote:
Originally Posted by ForceMajeure View Post
 

So you say if I connect the twfk this way

 

The woofer will receive current and will act regularly and the FK (tweeter) will have a High Pass filter (if so that's what I thought at the beginning but got confused)

 

If I add another cap to the positive wire (above pic) then I will have 1st order HP filter for the woofer and a 2nd order HP filter to the tweeter?

That's correct.

 

Quote:

 

@piotrus-g Have you tried them?

You mean listening to them? no.

post #5094 of 5099
I surfing around and find interesting driver from aliexpress. Here some pics from the seller homepage (store page).
Credit, this pics not taken by me.




Edited by audiofreakie - Today at 2:50 am
post #5095 of 5099

Interesting! It's like a DD+BA hybrid unit in one housing!

 

BTW. I only wanted to metion that rep for Bellsing (Estron?) contacted me after noticing my post here re their TWFK-like driver - I must say I'm impressed! To think that BA manufacturer is watching over this thread? I think it really proves how important this thread is :)

post #5096 of 5099
Quote:
Originally Posted by audiofreakie View Post

I surfing around and find interesting driver from aliexpress. Here some pics from the seller homepage (store page).
Credit, this pics not taken by me. Warning: Spoiler! (Click to show)



 

Can You please share link to that in here or in PM ? I have no idea how is their FR but would be nice to use it for my custom full-wood CIEM test version ;)

post #5097 of 5099
Quote:
Originally Posted by piotrus-g View Post

Interesting! It's like a DD+BA hybrid unit in one housing!

BTW. I only wanted to metion that rep for Bellsing (Estron?) contacted me after noticing my post here re their TWFK-like driver - I must say I'm impressed! To think that BA manufacturer is watching over this thread? I think it really proves how important this thread is smily_headphones1.gif
I got mail from them when I visited the website link which was posted here. Good news is we can buy in small quality and paypal option is available.
post #5098 of 5099
Quote:
Originally Posted by CoiL View Post

Can You please share link to that in here or in PM ? I have no idea how is their FR but would be nice to use it for my custom full-wood CIEM test version wink.gif
S
Quote:
Originally Posted by CoiL View Post

Can You please share link to that in here or in PM ? I have no idea how is their FR but would be nice to use it for my custom full-wood CIEM test version wink.gif
Sure:
http://m.aliexpress.com/item/32602167794.html
post #5099 of 5099
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