DAC 2496 (AK4393) DAC KIT With CS8416+AK4393+5532 - Page 252 - diyAudio
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Old 7th May 2013, 12:03 PM   #2511
bismuth is offline bismuth  France
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Quote:
Originally Posted by hotiron View Post
The TENOR Chip works great but this is the dogs bollocks.
Need a bigger case now though!!
Hi, what is the circuit on perfboard for ? a discrete output stage ?
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Old 7th May 2013, 07:10 PM   #2512
hotiron is offline hotiron  Scotland
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Yes it's a discrete output stage.
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Old 7th May 2013, 07:17 PM   #2513
hotiron is offline hotiron  Scotland
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Quote:
Originally Posted by auxie22 View Post
@hotinron where did you get the usb converter board from? ebay?

us it this one from zoe_tsang

CM6631 USB DAC Coaxial Fiber 192kHz 32bit I2S 192K 24bit Spdif WLX 66 | eBay
No I bought this one but it doesnt seem to be listed anymore.
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Old 7th May 2013, 07:20 PM   #2514
hotiron is offline hotiron  Scotland
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Quote:
Originally Posted by auxie22 View Post
@hotiron would love to see more of your design looks great everything in one box
What do you want to see? I'll take some pics later on.
The case is an old printer switch

I tend to use old set top boxes also.
Use a piece of wood for the new front panel.
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Old 7th May 2013, 09:17 PM   #2515
hotiron is offline hotiron  Scotland
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I used this for the discrete output.

Ray's Audio Page
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Old 8th May 2013, 08:30 AM   #2516
bismuth is offline bismuth  France
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Quote:
Originally Posted by hotiron View Post
I used this for the discrete output.

Ray's Audio Page
Thanks, did you adapt the component values to match the low pass filter recommended by AKM (fc=125kHz, Q=0.692) ?
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Old 8th May 2013, 08:52 AM   #2517
hotiron is offline hotiron  Scotland
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I didn't use the low pass filter section.
I have checked it with the scope and its totally clean.
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Old 8th May 2013, 08:33 PM   #2518
SWIN is offline SWIN  Sweden
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Still trying to get the DAC to run with the LME49990.

Bypassed the supply, earth to + and - supply with a 10 uF tantalum (ELFA 67-704-57), a 2,2 uF ceramic (ELFA 65-721-20) and a 470 nF ceramic (ELFA 65-200-19) as per design note for the LME49990.

Also hooked up some 56 ohms in series with the output.

Must buy a IR thermometer, think itīs still on the hot side - scope looks OK, but itīs only a 40 MHz.

On the adapter, the lacquer past the output pin has started to vaporize some mm out.

Sound quality is a bit colder, used Wima MKS 4, 1 uF as bypass before - sounded warm,fat and open.

Now with tantalum and ceramics bypassing the opamp, a bit cold and clear - the bypass close to the opamp is very important - donīt use a electrolyte there.
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Old 9th May 2013, 01:32 PM   #2519
SWIN is offline SWIN  Sweden
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A conclusion to my experiments with the LME49990 on this DAC.

It is a very nice, and open sounding op-amp, very well suited to this DAC.

The LME49990 does not oscillate, if 3 good quality foil 1 uF caps are used, coupled directly to the DIP8 pins on the underside of the PCB, +/- and earth.

It may oscillate, because of capacitance in output cables - use 30-50 Ohm series resistance on the output, best way is directly on the protruding feedback resistors.

The LME49990 will overheat if anything over about +/- 10 Volts is applied.
I was using +/- 15 Volts, which will melt the adapter board.
It is rated at +/- 18 Volts, but will need liquid cooling for safe operations at that voltage.
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Old 12th May 2013, 12:21 PM   #2520
knorst is offline knorst  Germany
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Hey Guys,

I need your help right now

Currently i'm in the ordering process at mouser electronics for the BOM

Can I swap the 47uf 25v elna ROA Cerafine with silmic 2, as they are available at mouser's??

Further:

Which resistors can i use in the signal part?? They should be available at mouser.

It would be quite cool, if you could give me the part numbers from mouser, because i'm quite a noob..

greetings
knorst
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