Yes, you can measure with a decent multimeter like Fluke or similar in AC volts and check the frequency as well, here you can see it: https://www.head-fi.org/threads/l-k-s-audio-mh-da004-dual-es9038pro-dac-van-dammes-double-impact.840938/post-14689266

In your case I would initially check if there is sound in the I/V converter resistors when you execute a test signal, for example 1khz 0db, from the result I would search backwards or forwards of this stage. The resistors are under the pcb, here these new ones were installed above...

I can assure you with knowledge and with many comparisons of dacs in the current market, that a well-tuned LKS004, is at the level $ 3,000 to $ 4,000 dacs, another thing is that you like dacs of renowned brands and designs not "made in china", otherwise this tuning will squeeze the most that two...

B0bb you have a restless soul, you always seek to improve, thank you for sharing your new projects

I bought these, are shielded 470nH: https://www.mouser.es/ProductDetail/Murata-Electronics/LQM21PNR47MG0D?qs=Gufeu08L%2Fl1%252BjocillWQvQ%3D%3D I have not installed them yet and I cannot speak of their effect, although Xoverman did do interesting tests with inductors. By the way, what brand are...

It is in the burn-out period, the positions were corrected for the LT regulator adjustment components, 1uf / 63v capacitors installed, here you can see how small the original Mundorf seems.

Ok thanks, I did not know about this condenser, I will install them in that place, I will have patience in the burning process.

Yes, right, that resistance should be behind in smd pads, I will correct it, the capacitor is soldered on the bottom side, I will put them as you say.

Some summer upgrades before tackling the "external power supply" project, all based on B0bb's recommendations from a few months ago. Basically higher capacity in some critical points and changes of 100nf mylar capacitors, and the Kemet Slit Foil of 10,000uf / 63v that have forced me to relocate...

B0bb, Xoverman, this is the electronic load that I have designed to test the supercapacitor module, I think it is enough to be able to see many parameters such as the dreaded charge noise of 350Khz, 5v are necessary for the oamp and the power supply of the visualizer display V / A (this will be...

En breve pondré las medidas de mi analizador de hp en las fuentes de alimentación, mientras me divierto con el pcb supercaps Maxim, estoy fabricando una carga electrónica ajustable hasta 10A con un mosfet de potencia y uno operacional entre otros elementos, sin esto no yo puede hacer pruebas...

Yes, I agree, audio fads come but sometimes they don't stay for long, until now the supercaps were for use in energy maintenance for volatile memories with little consumption, maybe and it is just my thought that it is not from Engineer, the only positive thing is the ultra low internal...

I only seeing if there is a reasonable performance possibility with the use of supercaps in the more noise sensitive dac supplies, 1300ma is a lot of current for only 175F, so look to get to 2x 3000F in series, maybe it would only be reasonable to use it for the 3.3v XO clock, batteries is...

Yes indeed that Maxim chip charges at a frequency of 350khz, in theory I did not see it as important because in the charging process the dac will be totally inactive, once the supercap is loaded, the pic would be notified of it by an input, disconnect the charging process and the oscillator, and...

I'm glad you can enjoy it, it turned out very well.

El manejo de la corriente de recarga es algo fundamental o la situación se vuelve muy peligrosa, por eso compré un kit de evaluación para ver a qué me estoy enfrentando y ver en la práctica que conclusiones saco de esto, si es seguro y factible lo haré, pero si no es confiable o útil quizás...

As I have been studying it seems that for every 100F of capacity a current of 0.3AH can be obtained, (300mA for one hour and 2.7v), with 2 supercapacitors of 3000F in series we obtain 1500F and up to 5.4v of maximum voltage, which gives a current capacity of 4.5AH for a cost of about $ 100 for...

Yes, the start and stop system of the power supply that I want to design will be managed by a small pic microcontroller, it is very important what you mention that the start of the dac microcontroller must be the last thing to send the initial parameters to the 9038pro that must already be...

Apart from the issue that you both bring and discuss up on the effect on the sound of the minor or major ripple in the power supply, you do not see anything good to the use of clean power with supercapacitors at some key point of clean power for our LKS, I know that they are dangerous in the...

The sound quality achieved is exceptional in a 004 modified with logical criteria and good materials, even the noise and the power supplies can be improved, I think this will always be possible, perhaps as I said, using power supplies with supercapacitors batteries in 2 banks seem to be the cusp...

You are very bad boys :slight_smile:, you are going to make me dust off my hp spectrum analyzer, open my 004 and measure the 100hz ripple before and after regulation, how happy I was to this day. I suppose that everything can still be improved, those modules LT3045 multi chps are the best in...

What have you done now, Mr. Xoverman? There are huge capacitors in the place where the transformers used to be, which you have designed now? You are a box of surprises! :slight_smile:

B0bb a question about this ECOC OCXO, it consists of 5 terminals, 1 is Vcontrol and 2 is Vref, these pins would be left unconnected or do they need something for their correct operation?

In this unit for sale strange unknowns are seen, what happened there?

Those types of modifications already appeared around here in 2018, it was another different approach to improve the 004. Summarized: 1. Remove fuse distortions. 2. Twist AC wires from IEC to power switch 3. Hard wire all AC connections to IEC inlet 4. Re-ground the shield wires from the...