Thank you 🙏

LOL trying not to as best I can these were new ones uncharged, they are hard to discharge takes a long time they hold a lot of power.

Thanks Philip I struggled a lot with Ground as well I talk about it on my streamer build at 18min:30s basically you have 1)The Chassis (the Case) connect that to the Mains ground (electrical socket ground) 2)The battery ground can be 1) not connected to anything 2) connected to the Chassis 3) use a x2 capacitor and resistor what I did see my streamer video at 18min:30s but you can try and see if you hear differences. One important thing Ian's LifePo4 stand offs are connected to ground making the switching power supply grounded as well ( hate those switching power supplies)I used Plastic Stand offs as the battery power was showing added Noise on my Oscilloscope. 3) signal ground ( the negative of say a rca input it output cable or I2s cable not applicable much in this setup but I noticed the hdmi shield is connected to the battery ground by default on Ian’s board but left it as is. Use the same point on the chassis to connect things to it Hope that helps

@@Gabster1 Thank you very much for your comprehensive reply. I understand it a bit better now. I will experiment with nylon stand offs on the power sections and see if I hear a difference!

Most likely yes just be careful

Thanks for letting me know I fixed it :)

I would try to keep the Dac as pure as possible so no DSP no Subwoofer these can be implemented in a preamplifier or amplifier build with a bypass switch. In Genreal I am not a fan of DSP as I find it introduce circuits that are not HIFI unless you are using very expensive DSP's best spend more time setting up the speakers better and do some room treatments. hope I understood your question.

@@Gabster1 Thanks...I'm interested in exploring manipulating the data stream in the digital domain (software based EQ/DSP/tone control or whatever you want to call it) before analog conversion. So in my example this would imply doubling the dacs (having two dac boards)....not sure how to set that up

@@Gabster1 If you are going to implement a DSP best to interface where the sound is still in the digital domain. If you put something like that into a preamp or amp you are then having to sample and the output of your high end DAC and convert back into analogue meaning all the money and time spent build this DAC is kind of wasted. So many system builders seem to make this fundamental mistake.

I used the 95/98 in my streamer but lately prefer Crystek CCHD 957 It also depends on your system an what you like The Crystek are more analytical lots of details

Hi Aiello not sure what you mean by the Isolator II I only see the linear pi and ucmate conditioner on the left but if you check the Part 3 video kzfaq.info/get/bejne/oK-mddybysrIdX0.html between 3:30 and 6 you see the stack in detail I ended up using the regular station Pi not the pro as I did not need any of the pro features also will be using Ian's new Fifo Q7 more videos on this build sill to come.

That is the daughter board of the StationPi pro it comes with the StationPi pro. Just to confirm I contacted Ian and the daughter board does not provide additional isolation. It is good to use it for Better integrate with USB and Amanero. if you do not need that no need to install it also if you do not need all the extra connection and a touch screen like me the Old StationPi is as good.

@@Gabster1 Thank you for the clarification ;) ....I have watched all your videos several times ;) I hope there will be a detailed video of the assembly of the IAN parts ..please ;)

All 4 watch for + and - once soldered extremely hard to desolder do not short once charged to avoid fireworks 💥

@@Gabster1 thank you very much for your time and answering, that helps me a lot :) how they are shot was clear to me... here is a link with two videos of the construction of my streamer, inspired by your work kzfaq.info/love/AHuhWuFQtrraxZjYvFj_Rg by the way :: ;) i would be happy if you press the subscribe button ;) ;)

Ropieee / Roon

i never heard about Ropieee / Roon but looks great. its unique that a direct connected display is supported

Unfortunately no but if you follow the 5 videos in the series you could build it or you can start with the simple streamer video I release a couple weeks ago

I am waiting on the high end IV transformers hoping to get them soon but so far looks and sounds great.

@@Gabster1 did you get Ivan's smaller or larger transformers? I'm really excited about doing this project! So cool!

@@jrhammond95003 I initially got the small one but got a bit damaged by shipping was rattling a bit but still sound good but he was kind to offer a replacement then I opted to pay extra and upgrade to the large one with a fet active option if I need to but it comes by slow boat like 6 weeks should be here any day :)

I have been waiting for some parts mainly waiting on the high end IV transformers from Ivan in Kazakhstan just got them 6 weeks later They are burning now but so far great should have a follow-up in the next few weeks :)

The internal resistance of supercapacitors is typically an order of magnitude lower than batteries,

@@Gabster1 But that makes no difference what so ever if you are just powering the digital electronics from it. Batteries with linear regulators will provide rock solid voltage and current and if you are worried about variable loads causing issues then a couple of ordinality electrolytic capacitors on the output stage of the power supply will be more than enough to decouple the PSU electronics. Remember its only the output from the DAC that needs the super stable power supply too so the raspberry pi and anything else in the digital domain will be fine even with switching noise. As long as there is some opto isolation between that and the DAC circuitry and it is all well shielded and the DAC reference voltage is very stable the audio output will be rock solid. As far as getting digital audio to the DAC you don't need to worry about jitter unless it is so bad it is causing errors in the audio output which is doubtful. I think a lot of the additional circuitry you have between the PI and the DAC is really not required. The SPI signal from the PI will likely be easily stable enough not to cause any errors due to jitter, its not like you are sending it over several metres of cable. All that said the setup you have there should work flawlessly, power supplies will be ultra stable and you have shielded everything well but it is overkill in many areas.

@@schrodingerscat1863 right? Especially seeing as several lithium batteries on the market have a 60c discharge rating so there will be 0 voltage from that the DAC will see the only real difference being that to the batteries will have a hundred times more charge in them in those supercapacitors so the last longer between charges

@@SheikhN-bible-syndrome Exactly.

Your Yamaha receiver contains a Burr Brown DSD1791 stereo DAC. Get hold of the data sheet for this. The DAC provides balanced differential outputs for left and right channels, L+, L-, R+, R-. These outputs will be fed into an anti aliasing filter, which could be a simple RC filter or it could be an active filter using a couple of op. amps. You're going to need to trace the circuit out or get hold of a schematic diagram for the Yamaha. You need to find the output of the two anti aliasing filters. Then you need a little bit of circuitry using a high performance audio op.amp such as NE5532 or NE5534 configured as a voltage follower, which has a high input impedance and low output impedance. Connect the output of the anti aliasing filters to the input of the NE5532 voltage followers. If you are lucky, you will get a high enough output voltage from the output of the voltage followers. If not, then you will need a non inverting amplifier circuit, again using NE5532 op. amps. Determine what gain you need , and ideally set it with decent quality low nice, low tolerance resistors. Connect the output of the voltage followers (or non inverting amplifiers) to RCA phono jack's that you mount to the chassis. Sort out the power supply for the NE5532 devices. If you are not strong on electronics and op. amp circuits, then I would not recommend undertaking this.