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Old 27th March 2013, 04:38 PM   #1
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Default Upgrading TE7022L

Hello all, I have been lurking for a while and finally made a purchase worth posting about. I recently bought the HA Info U2 Plus USB DAC / headphone amp. So far it sounds pretty great with my HD 280 Pros, and I am starting to wonder what else is available to modify. I already replaced the included opa2604 with a opa2134 that I had lying around. It definitely sounds noticeably better, but I am still interested in trying other op-amps out (AD797BRZ?).

On to my main question.. Is it possible to simply replace the TE7022L with something like the TE8802, which supports 24/192 and async usb? Will anything else need upgrading?

I am totally new to this hobby, so any other suggestions would be greatly appreciated!
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Old 27th March 2013, 06:00 PM   #2
JLOP is offline JLOP  France
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Good question, thanks for asking !
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Old 28th March 2013, 01:58 AM   #3
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I think first change the xo for the te7022. it is 12mhz. change to tent labs if the price is okay for you and you can make it fit ok. maybe change the 3.3V regulators ?

Another choice :

ͧ*响

but I think no need to change. better to buy another good product to compare - es9023 dac.
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Last edited by Nanoloop; 28th March 2013 at 02:08 AM.
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Old 28th March 2013, 03:21 AM   #4
jambul is offline jambul  Belgium
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imo, you can add the filter on the power suply, the Odac filtering the supply from usb connection using 1.0mh inductor.

and then separate the supply for TE7022 & supply for Clock, and change the clock by the better one

:-)
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Old 31st March 2013, 08:19 PM   #5
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Default CLock Fox 924B TCXO

Quote:
Originally Posted by jambul View Post
imo, you can add the filter on the power suply, the Odac filtering the supply from usb connection using 1.0mh inductor.

and then separate the supply for TE7022 & supply for Clock, and change the clock by the better one

:-)

I have used the Fox 924B TCXO with the TE7022, a very easy transplant. I agree you will want separate regulators for the clock, the Tenor chip, the DAC, and whatever else. The Micrel 5209
MIC5209-3.3YS TR Micrel Inc | 576-1274-1-ND | DigiKey

is a pretty low noise regulator and has a big enough package to work with without a PCB. I would use a SMD ferrite bead in series with the TCXO V+ input pin, and maybe a .01uF cab to ground from the V+ pin.

Odac schematic is here:

http://www.yoyodyneconsulting.ca/dow...AC-release.pdf

it would help you chose power filtration for certain pins on the TE7022, and shows you the pin# 37 you need to inject the clock at after removing the old crystal, if that is all you have. You will see ODAC filters the TE7022 internally-generated 1.8V pin...

Some people like USB isolators [possible on a TE7022], some people like a very very short standard USB cable, like a few inches long.
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