ES9023 + LM4766 DAC AMP KIT - diyAudio
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Old 4th May 2013, 04:02 AM   #1
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Smile ES9023 + LM4766 DAC AMP KIT

Hello,

I buy a kit such as this for some fun.

ES9023DAC PCM2706 CS8421 192KHZ 24BIT LM4766 Omron USB DAC Kit WLX | eBay

I do not expect it is excellent.... but maybe it can be good. Anybody try ?

I expect routing is crazy because of the IC placing, and LM4766 amp have no regulator, so THD depend on transformer size / load.

If you have this kit, or have experience with this IC, please share the tips. I will put photos on when it is arrived.



Edit for summary.

PCB marking is not correct. It will give a bad sound. Here is important change. Kits not have 680R. It have 630R. The markings give distortion but change does not and gain is enough. Here is other changes.

Kit parts are not enough. For the speaker protection it need 4.7uF 16V, 330uF 25V + 100nF film bypass. For the LT1086, it need 1500uF 16V, 150uF 6.3V. Amp need 3 50V 100nF X7R (through hole not smt) for noise decouple on pins. DAC need 2 4700pF film capacitor to replace smt ceramic. It also need R8, 130k resistor. And 2 0603 100nF X7R on IC pins. Total for this is ~$7

DAC is very good despite 16 bit PCM2707. And PCM is easy to work with many devices and can have usb isolator such as the adum4160. CS8421 is good but the ES9023 is better with 50Mhz mclk. With 50MHz, 192Khz upsample sounds very good.

Amp is good. Extra ground return and decoupling on pins is good to to get lowest background noise, and the PCB have no other routing problem to fix for better sound. PCB is good - easy to solder/desolder many times.

Good for $50 ? I think yes for this money. For extra $10 on parts, also to get is 2 10,000uF 35V for more dynamic sound , and replace 180R at the base of LT1086 with 2 IR LED. Then for $5 more, replace 2 LM 3.3V and 1 LM 2.5V regulator with ADP151.

For $70, this is great value. Sound is above my expectation.
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Last edited by Nanoloop; 29th May 2013 at 04:24 AM.
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Old 6th May 2013, 09:14 PM   #2
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Looks a bit like a mess, but that does not need to say that much.

Some notes:
LM4766 does not need a perfect regulated supply, but it's power will be extremely limited with 15V +/- supply. (it is made for 30V +/-)

Looks like normal 7805 etc are used for the ES9023, that will NOT do.

CS8421 is used as receiver, ES9023 is in synchronous mode (without own clock). But the jitter specs of the CS8421 are way worse than the ES9023.
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Old 7th May 2013, 03:42 AM   #3
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Hi,

I make ES9023 before.

Hifimediy ES9023+TE7022 24/96 USB Dac

I have SRC4192, SRC4392, AD1896 but not try CS8421.

Maybe I can try Keantoken CFP for the LM4766, but I prefer regulated. Maybe try 15-0-15 transformer for +/-22V unregulated.
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Old 7th May 2013, 05:59 PM   #4
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Quote:
Originally Posted by Nanoloop View Post
I have SRC4192, SRC4392, AD1896 but not try CS8421.
Those three are exactly the same concerning sound quality, and all three much better than the CS8421. (actually still the best SRCs ever)
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Old 8th May 2013, 02:03 AM   #5
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I read the same about CS8420 but I do not see any serious test for CS8421.

Any feedback on new CS8421 high-res ASRC?

Up-sampling in Gigawork DAC

It use 32 bit inside so maybe not so bad. And it is hardware control so it is friendly for me.

I see it has master and slave mode, and max clock is 27mhz. So I wonder how ES will sound from 27mhz clock, and if it can be better to use 50mhz for ES and divide in half for 25mhz for CS8421 with 74_163.

For the LM, I see for full power it wants +/-30V and 5.5A supply so 18-0-18 200VA or bigger transformer seems okay.
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Last edited by Nanoloop; 8th May 2013 at 02:18 AM.
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Old 9th May 2013, 03:04 PM   #6
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Kits has arrived. Here are the photos.
Attached Images
File Type: jpg pcb1.jpg (524.7 KB, 613 views)
File Type: jpg parts1.jpg (543.5 KB, 587 views)
File Type: jpg parts2.jpg (536.8 KB, 559 views)
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Old 10th May 2013, 01:24 AM   #7
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I look up some parts. I cannot find SRe 12Mhz EB212A (BB212A ?) oscillator - anyone know this ?

The main bulk capacitor is Samwha HE 4700uF 35V and it have 2.09 Amp ripple. Large Aluminum Electrolytic Capacitor Bridge rectifier D25XB is 3A with no heatsink, 25A with. So from datasheet, these component okay for about 20W, so a 15-0-15 100VA is okay for this. After capacitor is snubber uses 4R7 _ 100nF. Traces for power and ground are wide with some effort on star ground, so maybe it is okay amp design. I am not the expert for the chip amp but this all seem to be okay.

There is speaker protector C1237HA uses 7812 power.

ES9023 uses LT1086 for ~3.6V (178/100 resistor). I cannot find any R8. I measure from pin6 to GND and it is 17K. Output capacitor are marked 472 on PCB - look like ceramic.

CS8421 uses CTS CB3 oscillator. It is a low phase noise / jitter part.

PCM2707 uses SRe EB212A (maybe BB212A ?) oscillator. I cannot identify / find a datasheet for this.

I also cannot identify 3 smt regulator. I cannot read the markings clearly 2LG ? 2LZ ?
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Last edited by Nanoloop; 10th May 2013 at 01:39 AM.
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Old 10th May 2013, 11:50 AM   #8
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I have connected and test it is working. Of course it must need the bigger heatsink etc for full power. It must burn in, but only 1 hour later... the bass is sounding good, the treble is a little bit crispy. It must play for some days before sound quality is known.
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File Type: jpg test.jpg (257.3 KB, 532 views)
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Old 11th May 2013, 02:17 AM   #9
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Some possible upgrades.

1. The dac power is from AC, rectified by 4 ON U1D diodes, and smoothed by 100uF next to headphone socket. This is 5mm spacing. It have 9.5V. I will use a bigger cap.

2. The es9023 uses 9.5V through lt1086 for 3.5V. There are many choices. I will try a tl431 zener to replace 180R for 3.75V out, or try two IR LED for ~3.65V. I choose this for low output impedance more than the lowest noise. I know ESS dac like low impedance supply.

3. The pcm2707 uses 3.3V. There is LT1086-5 pre-regulator for 5V. 3.3V is from 1117 regulator. The CS8421 use 3.3V and 2.5V from 5V pre-regulator. I will replace all with LP5907 or ADP151.

4. dac output is the corner RCA pair, always connected. I don't want it so I will cut the trace near the yellow relay. I will replace relay with Omron G6A-234P.

5. I will change/add some capacitors to improve the decoupling, and try for better sound after other changes. Definitely I will change the 4700pf ceramic on the ES9023 output. Although Wima look fake, they all test from 103nF to 105nF, so I am happy to keep them.

Sound is already better today. I am happy with this kit.
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Last edited by Nanoloop; 11th May 2013 at 02:20 AM.
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Old 14th May 2013, 09:01 AM   #10
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On previous posts:
I did not say CS8421 is bad, just that the specs are a bit below the popular SRC4192. But I'm confident that using the ES9023 in asynchronic modus, with a good 50MHz XO will be an improvement over feeding it with the CS8421.

Quote:
Originally Posted by Nanoloop View Post
2. The es9023 uses 9.5V through lt1086 for 3.5V. There are many choices. I will try a tl431 zener to replace 180R for 3.75V out, or try two IR LED for ~3.65V. I choose this for low output impedance more than the lowest noise. I know ESS dac like low impedance supply.
The LT1086 is a quite noisy regulator (0.1mV noise), thus using low-ESR caps in front and after this regulator will improve things, using reference diodes instead of the adjustment resistor will help as well, but seems overkill.

Quote:
3. The pcm2707 uses 3.3V. There is LT1086-5 pre-regulator for 5V. 3.3V is from 1117 regulator. The CS8421 use 3.3V and 2.5V from 5V pre-regulator. I will replace all with LP5907 or ADP151.
The output of the PCM2707 is reclocked by the CS8421, thus not sensitve. But the CS8421 should receive very clean power, perhaps even more important than the ES9023, because all jitter on the CS8421 will remain in your output signal.

The the supply of the XO feeding the CS8421 should also be very clean!


Quote:
5. I will change/add some capacitors to improve the decoupling, and try for better sound after other changes. Definitely I will change the 4700pf ceramic on the ES9023 output. Although Wima look fake, they all test from 103nF to 105nF, so I am happy to keep them.
The quality of the 1uF used for the chargepump is important.
The datasheet advices 1uF between the "NEG" and ground. But this is too small, use at least 2.2uF there, but rather 10uF. If the caps are mounted far away from the ES9023, it is good to place small 0603 or 0402 10-100nF caps directly on the pins of the ES9023, between AGND and NEG. Same would be nice between AVCC and AGND, but then you'll need a leaded cap, on top of the chip.

R8 shoud be present (+130k for 3.6V) otherwise the ES9023 clips on loud input. If the sound quality improves if you lower the volume of the input, (in Windows) then R8 is missiing.
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