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DAC-END R (ES9018) full assembled board

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I have covered the USB connector's pin 1 (Vcc pin) with a tape and powered the Amanero with DAC power, it works, no removal of LDO is needed.

I don't like very well your USB solution.

I suggest cut the pcb wire, very simple.
 

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Hello,

My DAC implementation (breadboard ;) ) was very sensitive to the mains: if I switched on/off a lamp or my soldering station I had drop outs.
So I installed a netfilter I had laying around: much better, no more dropouts.
Nice, netfilters that really do work :)

Regards,
Danny
 

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Hello

I still have problem with heat. Tryed 15 and 22 Ohm resistors instead of 10 Ohm but it is only 5 - 10 % beter.

Still not OK. Allso I have LOT of NOISE / RIPPLE on power supply lines.

Here are puctires. All is measured on JUMPERS J9 - J10 - ..... - J15 .

1.2V - L picture is with original resistor
1.2V - R picture is with 22 Ohm resistor
 

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Yes do that, then we're relieved of your constructive remarks ;)

I have severeal ideas but cannot measure oscilations and noise. Twisted pear had similar problems and bigger caps on output helped. More then 100 uf.I am planning to use 1000 uf. I know some off you will tell it is not good on shunts. I always put more both on out and input off regulators. They have to be closer to the shunt output. I will trow the 10 uf ceramics away. Also the ceramics by the opamps is gone allready.
 
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Hello

I still have problem with heat. Tryed 15 and 22 Ohm resistors instead of 10 Ohm but it is only 5 - 10 % beter.

Still not OK. Allso I have LOT of NOISE / RIPPLE on power supply lines.

Here are puctires. All is measured on JUMPERS J9 - J10 - ..... - J15 .

1.2V - L picture is with original resistor
1.2V - R picture is with 22 Ohm resistor

Hi there

Just to verify the measurement is correct. Please make a measurement as described in this pic. This will lower the noise that is introduced by the GND wire on the Scope Probe.

What frequency is the ripple?

Best Regards
Caad
 

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Power supply noise

We cannot speak of noise in the main DAC module because we have a 2 stage power supply.

A pair of LT1963 ultra low noise linear regulators create the +5V for digital section and the +5V for analog sections.

These regulators are followed by other linear regulators or hi-speed op-amp controller shunt.

All the following measurements has been created with Clio system by Audiomatica and Transit 24bit.

There is no noise on output terminal (-78dB), see file Noise_DACout, 50Hz at -82dB coming from the air.

Also if I connect the 2.2uF input cap. to the ground I see 50Hz at -82dB.

There is a little oscillation on 1.2analog shunt (about 15KHz at -36dB), see file Noise_1_2ana.

If you add a 100uF 6.3V in parallel to the 47uF smd this oscillation stop and the new measurement give -78dB.

The other shunt have no oscillation and also the 15V shunt without pre-regulator are able to eliminate any noise, (50-100Hz at -80dB).
 

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