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iBasso OEM Project - Page 6

post #76 of 497
"Otherwise, this amp is just another me too portable amp. It should really be special to have "Head-Fi" stamped on it.

-Ed"


Agreed.
post #77 of 497
I forgot about those batteries. They are everywhere now it seems. Very interesting idea!
post #78 of 497
>nsx_23
The price will depend on actual manufactured amount.
All I can tell you now is less than 250 buck
(because that's one of absolute requirement).
BTW they said me as follows
"If unit price for 50 unit order is 240USD, the unit price for 100 unit order can be 200USD."
"The price is going down if the order quantity is larger."

>Edwood
That's very very very nice idea
CR123A has so high power density which makes room and gives easy obtainability.
If CR123A batteries would be engaged, requires 4-6 in series to make 18V class.
In japan, rechargeable 3.6V CR123A has 880mAh that's enough and suitable for this hungry circuit.
So, I shall put it alternative.
How is internal resistance of it? That's what I concern about......


I'll ask iBasso to realize another Head-Fi signature version of fi. Quest (I think it as with Head-Fi logo).
If it would be OK, you guys shall buy it
I made Head-Fi's logo with adobe illustrator for stamping on it.
http://photo4.avi.jp/photo/7/396928/...-141939-pc.jpg
post #79 of 497
So this email you listed above "p3c_preorder @ yahoo.co.jp" is the one we send preorders to? I am interested in this amp for sure but what information does the preorder need?

Edit: ah sorry bout that...my mistake
post #80 of 497
Quote:
Originally Posted by RAQemUP View Post
So this email you listed above "p3c_preorder @ yahoo.co.jp" is the one we send preorders to? I am interested in this amp for sure but what information does the preorder need?
Dude - he put the spaces in the email address to prevent getting spammed by web-crawlers or autobots that collect email addresses - please edit your post above to make the email address not valid by adding the spaces back in!

I put the spaces back into the quoted text so I do not commit the same offense.
post #81 of 497
Quote:
Originally Posted by HeadphoneAddict View Post
Dude - he put the spaces in the email address to prevent getting spammed by web-crawlers or autobots that collect email addresses - please edit your post above to make the email address not valid by adding the spaces back in!

I put the spaces back into the quoted text so I do not commit the same offense.
I never realized that. Thanks for the info. I will have to remember that.
post #82 of 497
Quote:
Originally Posted by ryuzoh View Post
>Edwood
That's very very very nice idea
CR123A has so high power density which makes room and gives easy obtainability.
If CR123A batteries would be engaged, requires 4-6 in series to make 18V class.
In japan, rechargeable 3.6V CR123A has 880mAh that's enough and suitable for this hungry circuit.
So, I shall put it alternative.
How is internal resistance of it? That's what I concern about......
Not sure about internal resistance, but as it compares to other cells, it works very well, good enough to be used in high current draw (up to 3amps) flashlights.

It would be important to allow for a wider voltage range so that the primary, nonrechargeable Lithium CR123A cells can be used, since they are at 3V rather than the 3.6-3.8V that rechargeable Lithium Ion CR123A cells can be at.

If the converter could be of a boost type circuit, it could allow for fewer cells, at the cost of run time and added heat. It would be nice to have this Amp run on as few as two CR123A cells, but four cells would be OK, you really don't want to go with more than four cells.

You really don't want to make the same mistake as the iBasso D3 Python with five AAA cells. It's just an awkward number of batteries to deal with.

-Ed
post #83 of 497
Very sorry for my late X'mas present.
I'll soon receive the prototypes from them.

You can see pictures from this page (in Japanese).
P3c wiki "iBasso fi. Quest" - implementation and appearance

In default setting, it's going to supply 1 AD712JNZ on IC2 position,
1pin-3pin and 5pin-7pin connecting bar on IC9,
1 BUF634P per channel and blank SOIC pattern on opposite PCB,
you can solder BUF634Us on there (it realizes switching STACKED or NOT easily).
Also you can choose other DIP-OPAMPs as followers instead of BUF634s.

12 1000mAh SANYO NiMH AAAs to make 14.4V to 18V class power.
(800mAh non-brand NiMH AAAs on prototypes)

Alps RK097 50kOhms pot.

Caps are loaded as; C1-2 are Nichicon FG 3300uF 16V,
C10-C11 are Nichicon KZ 47uF 25V, C4-5 are ELNA Silmic 2 47uF 25V.
C8-9, C14-15, C18-19, C21-22 are WIMA's caps like in P3.
C6-7, C12-13 are blank pattern for soldering caps as you like.
C1-2 position can be loaded 18mm diameter caps like Nichicon FW 10000uF 16V.

Unfortunately, 1st lot preorders were filled.
I can accept preorders as 2nd lot from this time.

After our test and approval to prototypes, I'll lend one I modded to John to make a review here.

Cheers
post #84 of 497
Very interesting. Well it will have the voltage swing and current for most all phones. Now for the hearing.
post #85 of 497
Quote:
Originally Posted by ryuzoh View Post

12 1000mAh SANYO NiMH AAAs to make 14.4V to 18V class power.
(800mAh non-brand NiMH AAAs on prototypes)
12 AAA batteries?!? oh my...
post #86 of 497
There is a flashlight that can use AAA, AA or the CR123A mentioned above. Being able to use either AAA or CR123A would be very interesting. Some sort of adapter for the CR123A?
post #87 of 497
Reasons for couldn't apply CR123A and lithium cells are for safety
This higher voltage circuit brings about very severe requirements to charge because of 12-series.

Currently, development team in iBasso is bothered by this issue.
>>We just changed the adapter to 24V, and have to make some change on the value of the caps and resistors of the charging circuit.
>>It need some time to test the charge and discharge.
>>The previous charging circuit did not work very stable.
>>Please give us several days.
I always appreciate their endeavor.

Merit of lithium cells is downsizable, but risky for explosion on this circuit.
To make as less internal resistance as possible, I decided to use AAAs.
I selected SANYO's 1000mAh NiMH cells which are very low internal resistance (less than 25mOhms; mostly same as eneloop),
and it realizes stable power and shortening charge time (planned as 6 hours).
VR1 is charge voltage adjuster to reduce heat or to shorten charge time
post #88 of 497

What's the hell....?

http://photo4.avi.jp/photo/7/396928/...-145642-pc.jpg
http://photo4.avi.jp/photo/7/396928/...-145643-pc.jpg
http://photo4.avi.jp/photo/7/396928/...-145644-pc.jpg

>There are some difference between the prototype and the final production.
>The jacks on the prototype are not from Switchcraft.
>The batteries are not 1000mAh Sanyo.
>The charge female jack maybe changed to a bigger one.
>There are some resistor are double soldered on the board.
>All the minor errors will be charged on the final production.
>Also, there is not case come with the prototype.
>And, the final production will use different quality PCB.
>The PCB will be gold plated.
and, MUSE-KZ on production model.....

Superb....
I couldn't expect this definition with no mod
post #89 of 497
Any idea when will the final production available for purchase?
post #90 of 497

Visit in iBasso

>>theory_87
That depends on when they can be supplied switchcraft parts.
And, no final production will be started w/o my approval.

I'd actually visited in iBasso from 23rd to 24th to observe them and to have meeting with.
Uploads some pics here


Welcome.

Just seems to be entrance of ordinary office, but you can see the woman who is soldering D10.

At meeting space beyond the yellow wall.
Checking newer prototype with K701, K240M, HD600, etc.
The day was so hot and humid day 28deg.C (82deg.F)
I utterly soaked sweaty.

Newer circuit schematic and 1st-prototype w/ modded my P2.
So many changing and experiments again and again....
Hidden one is confidential but not newer product.
They are also trying AD743 w/ LMH6655 in P3.

This is developing and repairing section room on left side from the wall.

Assembling newer prototype.....

He is chief engineer in iBasso Mr. Li Jian Sheng(李建生).
I'm always appreciating his efforts.

On opposite in the room, D10 are under inspecting before packaging.

Beyond the meeting space, soldering team is struggling with D10 despite of humid day
4 inches fans for computer are cooling down their hands and faces.
All iBasso products are passing on their hands.

From opposite position.

P3s and D10s await assemble and loading of OPAMPs on window side.

This is an oven for soldering surface-mount IC chips as like in D-series.

Assemble room after soldering.
He is so polite and often gave me chinese cigarettes

On right side from assemble room, there is a room for parts, stocks, and materials.
This is rack for stock of their products, from left to right, D3, P3, D10 (currently making more stock of it... please wait for restarting)

PCB etching board for D2 Boa.

Unpainted enclosure of P3.

This rack is for materials and headphones for test.
And...D2?

(So sorry for lacking aperture value because of darkness)
Rear; MAD-1000
Front; Home-use DAC
I'm really looking forward to buy this DAC...
Input; Balanced, USB, Coax, Opt
Pot; ALPS RK271series
I proposed Mr. Li to use FETs in output.
Easily imaginable this DAC has huge potential when brushed up.
(But I don't know when it actually debuts.)
Also, I didn't expect allowance for uploading this photo here.
Thank you at all, iBasso.

Can' t help checkin' their products
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