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Review: Jkeny’s modified Hiface - Page 6

post #76 of 431
Quote:
Originally Posted by transient orca View Post
Does the amperage rating of the power supply matter? I have a 5V, 1Amp power supply. I presume the Hiface will only draw what it needs and not over-amp itself.
Correct! But again I would say forget the 5% & focus on the 95%

Why don't we all wait for slim.a's review of the modified USB cable?
post #77 of 431
If I understand correctly, this USB cable mod can also be used to hook up an external USB DAC to the computer.
Will the mod also provide only 5% significant increase in SQ?
If so, I don't see why getting power out of the USB cable from the computer is so detrimental to SQ.

I would however purchase this cable if it could provide significant increase in terms of SQ for other components than the hiface.

I guess we'll have to wait for Slim.a's review of jkeny's very special USB cable.
post #78 of 431
BTW, I just came across this thread doing exactly the same thing except he provides the 5V supply - £190 or £280 ($290 or $430) - I'm obviously underpricing it - must go & do a 5V supply & up my price M2Tech Hiface
post #79 of 431
Quote:
Originally Posted by jkeny View Post
BTW, I just came across this thread doing exactly the same thing except he provides the 5V supply - £190 or £280 ($290 or $430) - I'm obviously underpricing it - must go & do a 5V supply & up my price M2Tech Hiface
Jkeny, dont dare to rise the price!
post #80 of 431
Did you guys pick up on this review of the batteries? http://www.head-fi.org/forums/6581482-post935.html
Quote:
I compared one of the A123 batteries that Jkeny uses to a number of other highly regarded regs, including a PFM flea, and the battery was easily superior to any of them. Kinda sad really as I've spent years building and designing discrete regs. I'm not sure what actually makes the batteries better, so I need to run some more tests, but I suspect it's either self noise from the regs or earth leakage currents causing problems. Good batteries solve these problems, but obviously charging/maintenance becomes the issue.
post #81 of 431
Quote:
Originally Posted by jkeny View Post
Did you guys pick up on this review of the batteries? http://www.head-fi.org/forums/6581482-post935.html
That's very interesting. Do you think that powering a DAC, amps or maybe a computer could result in better SQ or performance?
I wonder if I could have such a mod done to my Audio-GD Reference One DAC or Phoenix HeadAmp/PreAmp for a relatively low price.
post #82 of 431
Quote:
Originally Posted by punk_guy182 View Post
That's very interesting. Do you think that powering a DAC, amps or maybe a computer could result in better SQ or performance?
I wonder if I could have such a mod done to my Audio-GD Reference One DAC or Phoenix HeadAmp/PreAmp for a relatively low price.
I was wondering about the effects of battery power on the whole system too.

Maybe something like this should do the trick without too much DIY:

Products > Black Lightning - Red Wine Audio
post #83 of 431
The Black lightning looks like a very interesting alternative but it is much too expensive for what I can afford. Also, the LiFePo4 batteries used for the hiface mod seem to do the trick very well.
post #84 of 431
Yes, its quite pricey and probably an overkill for just the HiFace. I would consider it only if I was also going to power the dac and amp with it too.
post #85 of 431
I don't know what are the specs of the batteries used in the Black Lightning but I don't think they are as good as the ones used in the jkeny mod.
Perhaps Jkeny could share with us his thaughts on the matter.
post #86 of 431
Not sure what makes one better than the other. The Black Lighting uses huge SLA batteries, quite different application than LiFePO4 in jkeny's mod.
post #87 of 431
I don't know - all I know is that the batteries are better than anything I've ever heard so far & Sleepy_DAn also Can't say anymore than this.

If you want to send me one I'll test it

If you want to send me your audio-gd stuff I'm sure I can mod it

Here's a new development which will appeal to some but it's meant for those who know how to properly handle I2S so please don't ask a whole rake of questions:

Quote:
I am supplying a Hiface USB-I2S module for feeding I2S into the digital input of DACs. I2S is a lower jitter & more direct digital communication method than SPDIF if implemented correctly. ......

This 24/192 asynchronous USB transport using low jitter clocks with optimised power supply feeding I2S directly to a DAC should result in the best computer audio available today.

This Hiface version is focused on I2S with NO SPDIF output. It will have PS connectors that can be connected to the supplies of choice; on-board 3.3V regs, batteries or external PS. No power is drawn from the USB cable so no reliance on the often variable quality of computer PS & therefore no need for so called "audiophile" USB cable - a reasonable standard USB cable will be as good as an expensive one.
DAC Options (Hiface USB Transport Modifications & Ancillaries)
post #88 of 431
Great work John

Regarding the I2S mod i have an assemblage 2.7 dac that I'm heavily modding.
It has three inputs; coax-bnc, opt-tos and aes/ebu.
I want to remove one of the input connectors and wire your I2S modded Hi-face straight to the inputs on the board.
Is this possible to simply wire the I2S into one of these inputs or does it require extra modifications to the dac design?
I would most like to replace the aes/ebu input as i don't have anything with that connector but i think it might be harder to implement than the coax input?

As I'm building a new, much bigger case (4mm and 8mm aluminum lined with copper) I'm probably going to power the whole dac on LiFePO4 batteries.

When i start I'll post a new thread with pictures.

Nathan
post #89 of 431
Quote:
Originally Posted by Zerotohero View Post
Great work John

Regarding the I2S mod i have an assemblage 2.7 dac that I'm heavily modding.
It has three inputs; coax-bnc, opt-tos and aes/ebu.
I want to remove one of the input connectors and wire your I2S modded Hi-face straight to the inputs on the board.
Is this possible to simply wire the I2S into one of these inputs or does it require extra modifications to the dac design?
I'm reluctant to offer I2S output because it is too easy to get it wrong & I really don't have the time nor do I want the responsibility of telling people how to wire it up. If the DAC has defined I2S inputs then it's a matter of wiring to these with twisted pair or mini-coax (50ohm) with as short a lead as possible.

I'm doing a I2S-only version of the Hiface for particular DACs that I know can be fed I2S easily & I can control this feed - Buffalo, AckoDAC, (possibly the TeraDak Chameleon which I might be modding when the daughter board is sent to me)

I would most like to replace the aes/ebu input as i don't have anything with that connector but i think it might be harder to implement than the coax input?

Quote:
As I'm building a new, much bigger case (4mm and 8mm aluminum lined with copper) I'm probably going to power the whole dac on LiFePO4 batteries.

When i start I'll post a new thread with pictures.

Nathan
Sounds good already
post #90 of 431
I have found a cheaper adapter and the shipping fees are considerably less expensive compared to the BatterySpace.com website.
Here it is: Rechargeable Batteries & Battery Chargers - Conversion Cable from DC Female to Standard Tamiya Male Connector

You can find the charger that Jkeny recommends and this adapter from the same seller. That's too bad that they don't sell their adapter on their ebay store because shipping fees would have been even less expensive. Shipping fees to Canada for the adapter and the charger are $22USD. On the allbattery.com website it costs almost $60USD.
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