Probably worth trying. Allo uses shielding cans over the clocks in their commercial dacs. The Allo guys are very measurement oriented so I presume they have measured some benefit.
One thing, there are a lot of surrounding devices around us, that operate on a high/low/mid frequencies, but many use/love an aluminum case, which makes protection even more difficult because aluminum is not a good for external influences protection, but on metal case for sure you will have better result. I'm using 1mm Fe
Agreed aluminum is not ideal. It needs to be about 1/2" thick to shield as effectively as 18ga (1.214mm) steel.
And allso we have to pay attention to internal influence too. That's why I think that these mu-metal shields should be installed on some important circuity for an even better result.
I did a lot of testing on the CT7302 and got mixed results; failed and also had some success, with some results as follows:
1-The early designs were pretty bad, including the manufacturer's sample board, noisy sound, and a lot of outside influences.
2- After about 10 times of layout and redesign, the sound or more has little depth and noise. The more layouts I follow, the more interesting and wonderful it is to me.
3- I ended up choosing it with Andrea, it took us almost 2 years to work through the issues, it's pretty good now, and hopefully in the future it will be even more improved for the CT7302.
Please try it out!
Yes sure, my faworite src bridge! What I not tried is usb bridge. Did you tried? Is comparable with Amanero? What I would like to is in future CT ic is an DSP implementation, hope Comtrue make and give us something like that in near future, that would be great!
We have made first pdm modulated (dsd64) direct digital power dac (DDPD), H bridge, test board will be ready next week, it will be combined with CT7302PL as a converter to dsd64, project is 2x3W on 8 ohm load, volume control is done by variable power supply on H bridge, next plan is gan fet H bridge.
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Success in DDPD concept! Next what I want to do is to use two ct7302pl, first one for handling optic, usb and every other input and convert it to PCM, than those PCM goes to ADAU1462, than seccond CT as a converter to DSD64 for output to DDPD. I'm tested DDPD with DSD256 with success, have no way to test DSD512 using Amanero as a current test signal but I'm believing DDPD have no problem too with DSD512. Comparation between DDPD and flow water heater is that DDPD have bits flow and water heater have water flow 🙂 Also I have in plan to try raspberry pi 4 barebone os and use gpios for suplying DDPD with DSD trought gpio, also to implement camilladsp... Please hear
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Maybe its the cell phone mic, but the vocal in the video sounds thin, shrill, and distorted to me. Listening with a laptop dac and some headphones, so probably not ideal. Doesn't usually sound like the video though.
Yes mic on my xperia 10 is probably not a good source to record audio realy, there is a rustling sound, probably the phone is not recording the sound properly, probably have some automatic recording corections. What deliver this amp is unbelievable, the huge dynamic and huge mids! Hf is somehow not ideal, need to be changeg, and replaced with 4th order filters and it will be ok. Generaly this amp sound better than anything I heard recently, mean to mids and lows, huge sound stage. And H bridge have no problem even on dsd256 as a pdm modulation to H bridge which is around 2.8 up to 11MHz tested without any problem! By default minimum is 2.8MHz! 🙂
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There is 32 ultra fast half bridges in paralel per channel, it forms full bridge, 16/16. More half bridges more amps. No FB at all, but plan is designing 1bit adc at the speaker vires which will be feed to smething at the input to make auto digital input signal corection, curenly we are out of idea how to make something like that, it need to be ultra fast, but my hope we will figure that out. Even without fb things is very promising! I will probaly open new thread, in my hope more brains in paralel will make something new in relation to concept. First in the World direct digitaly driven pdm modulated full bridge with a variable supply as a volume control! 5V fully CMOS class D 🙂
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Yes I will do that but not that soon, maybe in two-three months, recently I have bought Cosmos ADC and need to complete some pcb for Rew, conbination flow for measurement will be Rew -> Amanero -> CT7302PL -> DDPD -> Cosmos ADC -> Rew, need to finish some other projects before I get back to DDPD measurements, but I will do that for sure!
Yes me too! I'm allready made my own ADAU1462, and I will connect two CT7302PL, first one to convert everything to PCM, than PCM goes to ADAU, than to another CT7302PL for conversion to DSD than to DDPD. If everything is working plan is to make DDPD concept with Gan.
Here is DSP material, note that I'm not tested it! Do not have free time for that right now. If something is wrong on schematic please let me know. Which DSP you have using?
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