tag:blogger.com,1999:blog-4781727111866727703.post263364534770299262..comments2024-03-28T00:31:13.472-07:00Comments on <em>Archimago's Musings</em>: EARLY LOOK: E1DA Cosmos APU - high performance, low-noise pre-amp and 1/10kHz notch filter. [Quick peek - S.M.S.L. DO100 DAC.]Archimagohttp://www.blogger.com/profile/08642574001287787545noreply@blogger.comBlogger20125tag:blogger.com,1999:blog-4781727111866727703.post-69134384077318378352022-05-19T08:04:21.162-07:002022-05-19T08:04:21.162-07:00Hi Archimago, it seems that you are on the right t...Hi Archimago, it seems that you are on the right track. THD -148 dB is close to what Victor declares. I would increase the FFT points to the 512k-1M to go deeper in the noise.<br /><br />MartinMGhttps://www.blogger.com/profile/11072327855051349505noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-8725909977788925312022-05-19T07:14:37.648-07:002022-05-19T07:14:37.648-07:00This comment has been removed by the author.MGhttps://www.blogger.com/profile/11072327855051349505noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-35910712533603565092022-05-19T06:52:23.012-07:002022-05-19T06:52:23.012-07:00Thanks for clarifying. I understand it now. Thanks for clarifying. I understand it now. Doughttps://www.blogger.com/profile/12981828921649308703noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-64987745830962281172022-05-18T22:09:56.304-07:002022-05-18T22:09:56.304-07:00Thanks! Hmmm, might have to give that one a shot ;...Thanks! Hmmm, might have to give that one a shot ;-).<br /><br />For the time being with my variable power supply, I played around with it more and pumped voltage to 35V (from 33). Got almost THD -148dB. Not quite -155dB but not too bad especially with a THD+N -117.5dB.<br /><br />See Addendum with the scaled APx555B FFT.Archimagohttps://www.blogger.com/profile/08642574001287787545noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-19783271978501956412022-05-18T12:51:52.612-07:002022-05-18T12:51:52.612-07:00I think Victor is using four 9V alkaline batteries...I think Victor is using four 9V alkaline batteries.<br />MartinMGhttps://www.blogger.com/profile/11072327855051349505noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-23129544946951582802022-05-18T00:03:15.442-07:002022-05-18T00:03:15.442-07:00Impressive Martin,
Maybe the key is the DC/DC conv...Impressive <em>Martin</em>,<br />Maybe the key is the DC/DC converter you're using. I haven't looked around but did Victor also speak about what power supply he's using by any chance?<br /><br />Archimagohttps://www.blogger.com/profile/08642574001287787545noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-15248814544041200232022-05-17T21:27:59.980-07:002022-05-17T21:27:59.980-07:00And here is what Victor measures:
https://www.diya...And here is what Victor measures:<br />https://www.diyaudio.com/community/threads/low-distortion-audio-range-oscillator.205304/post-6817876MGhttps://www.blogger.com/profile/11072327855051349505noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-19870161934412075802022-05-17T20:48:57.474-07:002022-05-17T20:48:57.474-07:00Hi, there is a thread on diyaudio.com (I am sure y...Hi, there is a thread on diyaudio.com (I am sure you know about it), where I publish my experiments:<br />https://www.diyaudio.com/community/threads/low-distortion-audio-range-oscillator.205304/post-7022462<br /><br />I use Focusrite Forte+ passive Twin-T notch + 32 dB LNA. For powering the osc I use simple DC/DC converters 5/18V in series powered with 5V battery charger.<br /><br />MartinMGhttps://www.blogger.com/profile/11072327855051349505noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-59706547175733270922022-05-17T19:17:22.782-07:002022-05-17T19:17:22.782-07:00Hi Doug,
I see you're looking at the 123.9dB i...Hi <em>Doug</em>,<br />I see you're looking at the 123.9dB is dynamic range measurement for the SMSL.<br /><br />As you noted, what's happening here is that the graph shows a +60dB gain applied to the noise floor. So if we look at 17kHz and that -89dB noise, it's actually -89-60dB=-149dB.<br /><br />Compared to the typical Audio Precision graphs you see online (like <em>ASR</em>) Archimagohttps://www.blogger.com/profile/08642574001287787545noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-28874668985615393432022-05-17T17:55:10.161-07:002022-05-17T17:55:10.161-07:00Interesting MG. I notice that there's some var...Interesting <em>MG</em>. I notice that there's some variability in the harmonics depending on the quality of the power supply I use... As you can see, I'm measuring this far from ideal circumstances.<br /><br />Wondering do you have an FFT of the Victor and what gear is being used to power the board and capture a THD of better than -155dB!?<br />Archimagohttps://www.blogger.com/profile/08642574001287787545noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-26222969291133342332022-05-16T09:01:23.656-07:002022-05-16T09:01:23.656-07:00Thanks for walking through how all of this is done...Thanks for walking through how all of this is done and sharing the various measurements. On the various graphs where you've noted THD+N, I'm having trouble mapping that number to the graph. Take the SMSL for example. I see THD+N noted as 123.9 dB but looking at the graph, I'm not seeing anything that looks like noise components near that level. I do see a component at roughly -73 dB Doughttps://www.blogger.com/profile/12981828921649308703noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-67711025068820448232022-05-16T07:54:11.980-07:002022-05-16T07:54:11.980-07:00Hi Archimago,
really good reading.
My comment is ...Hi Archimago,<br />really good reading. <br />My comment is about THD of the Victor's oscillator, -141 dB is not what it is capable of (less than -155 dB). What do you think about it?<br />MartinMGhttps://www.blogger.com/profile/11072327855051349505noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-21960327390218661782022-05-15T11:20:00.783-07:002022-05-15T11:20:00.783-07:00Yeah, I'm sure the design will deal with tempe...Yeah, I'm sure the design will deal with temperature issues. The DAC is designed for hi-res performance as well as both current and voltage output modes.<br /><br />One more thing. I believe E1DA's upcoming Cosmos DAC will also be based on a dual-ES9038Q2M architecture. Presumably USB-powered as well based on the rendering here:<br />https://e1dashz.wixsite.com/index/cosmos-dacArchimagohttps://www.blogger.com/profile/08642574001287787545noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-85942096490168958492022-05-15T10:52:31.949-07:002022-05-15T10:52:31.949-07:00Might get hot if you use it for high res files, mu...Might get hot if you use it for high res files, must be a reason for that it is intended only for low voltage environments, I guess.Read Hagenhttps://www.blogger.com/profile/06452528084900931335noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-81154066152933805322022-05-15T10:14:30.512-07:002022-05-15T10:14:30.512-07:00Hi Read,
Correct, the ES9038Q2M wasn't intende...Hi <em>Read</em>,<br />Correct, the ES9038Q2M wasn't <em>intended</em> to be used as a desktop amp since it can operate on such low power hence commonly seen in mobile applications.<br /><br />However, it does share many of the characteristics of its big brother the ES9038Pro. And at least with the DO100, it looks like they've integrated it into a dual-DAC package which does the job very Archimagohttps://www.blogger.com/profile/08642574001287787545noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-3754208409157403912022-05-15T10:08:51.669-07:002022-05-15T10:08:51.669-07:00Greetings Juergen!
Hope you're doing well!
Y...Greetings <em>Juergen</em>!<br /><br />Hope you're doing well!<br /><br />Yeah, the D90SE is quite the device and very impressive the performance from that ES9083Pro with the 8-channel I/V conversion design. Looks like a similar idea with the SMSL DO100 with the dual ES9038Q2M for mono output and quad OPA1612.<br /><br />Have a great spring and into summer man!Archimagohttps://www.blogger.com/profile/08642574001287787545noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-81874924370301580442022-05-15T10:02:14.673-07:002022-05-15T10:02:14.673-07:00A pleasure oagstes,
I think it's great to get ...A pleasure <em>oagstes</em>,<br />I think it's great to get the news out about what's available or coming up! Helps with dispelling unnecessary mystique!Archimagohttps://www.blogger.com/profile/08642574001287787545noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-78807879374653665912022-05-15T03:33:32.348-07:002022-05-15T03:33:32.348-07:00This chipset ES9038Q2M is NOT intended for desktop...This chipset ES9038Q2M is NOT intended for desktop use, only for portable devices due to its limitations. Read Hagenhttps://www.blogger.com/profile/06452528084900931335noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-69076183686667326022022-05-14T22:05:07.897-07:002022-05-14T22:05:07.897-07:00Hi Archi
A great read, thank you. I appreciate yo...Hi Archi<br /><br />A great read, thank you. I appreciate your effort on your page.<br /><br />All the best<br /><br />PS: I bought also a Topping D90SE. A great DAC. Really.JR_Audiohttps://www.blogger.com/profile/00547557948411188806noreply@blogger.comtag:blogger.com,1999:blog-4781727111866727703.post-88538344008322444382022-05-14T21:33:32.794-07:002022-05-14T21:33:32.794-07:00That's excellent. Thank you very much.That's excellent. Thank you very much.oagsteshttps://www.blogger.com/profile/14229891444275619410noreply@blogger.com