Atom Feed - Twisted Pear Audio Support - Topic:Trident V1.1 / Buffalo III - 20Twisted Pear Audio Support - Atom Feedurn:twistedpearaudio-com:AtomFeed:TwistedPearAudioSupport:Topic:TridentV1.1/BuffaloIII-20:1Copyright 2024 Twisted Pear Audio Support2024-03-29T09:14:56Zhttp://www.twistedpearaudio.com/forum/Images/YAFLogo.pngForum Adminhttp://www.twistedpearaudio.comfeedback@twistedpearaudio.comgreggtthttp://www.twistedpearaudio.com/forum/profile/26373-greggttgreggtthttp://www.twistedpearaudio.com/forum/profile/26373-greggttigy137http://www.twistedpearaudio.com/forum/profile/25491-igy137igy137http://www.twistedpearaudio.com/forum/profile/25491-igy137igy137http://www.twistedpearaudio.com/forum/profile/25491-igy137Russ Whitehttp://www.twistedpearaudio.com/forum/profile/9-Russ-WhiteRuss Whitehttp://www.twistedpearaudio.com/forum/profile/9-Russ-WhiteRuss Whitehttp://www.twistedpearaudio.com/forum/profile/9-Russ-Whiteigy137http://www.twistedpearaudio.com/forum/profile/25491-igy137Russ Whitehttp://www.twistedpearaudio.com/forum/profile/9-Russ-WhiteRuss Whitehttp://www.twistedpearaudio.com/forum/profile/9-Russ-Whiteigy137http://www.twistedpearaudio.com/forum/profile/25491-igy137Russ Whitehttp://www.twistedpearaudio.com/forum/profile/9-Russ-WhiteRuss Whitehttp://www.twistedpearaudio.com/forum/profile/9-Russ-WhiteRuss Whitehttp://www.twistedpearaudio.com/forum/profile/9-Russ-Whiteigy137http://www.twistedpearaudio.com/forum/profile/25491-igy137Russ Whitehttp://www.twistedpearaudio.com/forum/profile/9-Russ-WhiteRuss Whitehttp://www.twistedpearaudio.com/forum/profile/9-Russ-WhiteRuss Whitehttp://www.twistedpearaudio.com/forum/profile/9-Russ-Whiteigy137http://www.twistedpearaudio.com/forum/profile/25491-igy137igy137http://www.twistedpearaudio.com/forum/profile/25491-igy137YetAnotherForum.NETurn:twistedpearaudio-com:ftPosts:st1:meid23681:1Trident V1.1 / Buffalo III<table class="content postContainer_Alt" width="100%"><tr><td>Please revive this thread!<br /><br />I've followed this with interest as I too experienced a noise coming from my current-release Buffalo-III, similar to what 'igy137' described. Based solely on information posted by 'igy137' and 'peteo' (thank you!), I completely eliminated the noise by placing a 4.7uF (tantalum) cap on the output of the VDD_XO Trident reg only. What I lose sleep over, and what both Igy and Peter have alluded to, is this a good fix or merely covering up an underlying problem that should be diagnosed?<br /> <br />My current configuration is:<br />TPA Toslink module -> coax wire -> miniSHARC -> I2S [1.5"] ribbon cable ->B-III/Tridents [purchased 3/15] 6-channel mode, volume control pot -> (6) shielded twisted pair cable ->(3) IVY-3 -> balanced amps. A single 5.0v linear reg feeds the TOSLINK board, miniSHARC and B-III/Tridents. I believe my layout conforms to general recommendations, and wiring/soldering to be of the highest quality. The noise was sufficiently loud to be heard 1-2' from a medium efficiency tweeter fed by a 27db gain amp, the same from all outputs and did not vary with the B-III's volume or miniSHARC setting. As Igy experienced, putting a cap only on the VCC_XO reg made it dead quiet.<br /><br />Since I don't have a scope, my diagnosis is by listening what comes out of the speakers, which is why I've followed this thread so intently. Russ...Brian...someone(?), please continue it. Thanks.</td></tr></table>2016-01-11T03:07:39-07:002016-01-11T03:07:39-07:00greggtt<table class="content postContainer_Alt" width="100%"><tr><td>Please revive this thread!<br /><br />I've followed this with interest as I too experienced a noise coming from my current-release Buffalo-III, similar to what 'igy137' described. Based solely on information posted by 'igy137' and 'peteo' (thank you!), I completely eliminated the noise by placing a 4.7uF (tantalum) cap on the output of the VDD_XO Trident reg only. What I lose sleep over, and what both Igy and Peter have alluded to, is this a good fix or merely covering up an underlying problem that should be diagnosed?<br /> <br />My current configuration is:<br />TPA Toslink module -> coax wire -> miniSHARC -> I2S [1.5"] ribbon cable ->B-III/Tridents [purchased 3/15] 6-channel mode, volume control pot -> (6) shielded twisted pair cable ->(3) IVY-3 -> balanced amps. A single 5.0v linear reg feeds the TOSLINK board, miniSHARC and B-III/Tridents. I believe my layout conforms to general recommendations, and wiring/soldering to be of the highest quality. The noise was sufficiently loud to be heard 1-2' from a medium efficiency tweeter fed by a 27db gain amp, the same from all outputs and did not vary with the B-III's volume or miniSHARC setting. As Igy experienced, putting a cap only on the VCC_XO reg made it dead quiet.<br /><br />Since I don't have a scope, my diagnosis is by listening what comes out of the speakers, which is why I've followed this thread so intently. Russ...Brian...someone(?), please continue it. Thanks.</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23036:1Trident V1.1 / Buffalo III<table class="content postContainer" width="100%"><tr><td>This morning the smallest one in the family got me up early, and I could not sleep back, of course, so... I hooked up the rig as shown in the above picture (on the table), and started doing some tests.<br /><br />I verified that all is correct and there's no stutter at the output of the amp.<br />Then, I removed the added cap from DVCC. Started up, still no noise at the output.<br />Then, I removed the added cap from VDD_XO. Started up, and voila, the good old stutter could be heard from the speaker.<br /><br />I guess this is a bit strange, but isn't it possible that that 12.5MHz oscillation I showed in the other thread here is really there, causing some issues, possibly HF oscillations on the output, driving the amp crazy, or similar? (So far I did not check the DAC output on scope, just with a soundcard and there it's reasonably clear).</td></tr></table>2015-08-27T05:21:21-07:002015-08-27T05:21:21-07:00igy137<table class="content postContainer" width="100%"><tr><td>This morning the smallest one in the family got me up early, and I could not sleep back, of course, so... I hooked up the rig as shown in the above picture (on the table), and started doing some tests.<br /><br />I verified that all is correct and there's no stutter at the output of the amp.<br />Then, I removed the added cap from DVCC. Started up, still no noise at the output.<br />Then, I removed the added cap from VDD_XO. Started up, and voila, the good old stutter could be heard from the speaker.<br /><br />I guess this is a bit strange, but isn't it possible that that 12.5MHz oscillation I showed in the other thread here is really there, causing some issues, possibly HF oscillations on the output, driving the amp crazy, or similar? (So far I did not check the DAC output on scope, just with a soundcard and there it's reasonably clear).</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23034:1Trident V1.1 / Buffalo III<table class="content postContainer_Alt" width="100%"><tr><td>I quickly put it up on my desk as I wired up for initial tests (the dsp board still not there, comes behind the dac, i2s lines isolated).<br />2nd pic showing the (once planned) final arrangement (dac inside the copper box, placid hd bp under the ivys).<br /><br />(I tried also moving cables here and there and around with no influence heard at all, at least the output stuttering stayed for sure always).<br /></td></tr></table>2015-08-26T21:53:09-07:002015-08-26T21:53:09-07:00igy137<table class="content postContainer_Alt" width="100%"><tr><td>I quickly put it up on my desk as I wired up for initial tests (the dsp board still not there, comes behind the dac, i2s lines isolated).<br />2nd pic showing the (once planned) final arrangement (dac inside the copper box, placid hd bp under the ivys).<br /><br />(I tried also moving cables here and there and around with no influence heard at all, at least the output stuttering stayed for sure always).<br /></td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23033:1Trident V1.1 / Buffalo III<table class="content postContainer" width="100%"><tr><td>Russ, I very much appreciate your help :)<br />The thingy is pretty much disassembled now, I quickly took a photo as it's now, just buffalo and ps. It's basically as / or very similar as when I measured the tridents and placid. <br /><br />(Tomorrow I can hook it up with the amp/ps and make another pic, but actually is the same "style", for example dac directly connected to the NC400 amp (with it's standard SMPS600 PS), all stock cabling.)</td></tr></table>2015-08-26T21:32:27-07:002015-08-26T21:32:27-07:00igy137<table class="content postContainer" width="100%"><tr><td>Russ, I very much appreciate your help :)<br />The thingy is pretty much disassembled now, I quickly took a photo as it's now, just buffalo and ps. It's basically as / or very similar as when I measured the tridents and placid. <br /><br />(Tomorrow I can hook it up with the amp/ps and make another pic, but actually is the same "style", for example dac directly connected to the NC400 amp (with it's standard SMPS600 PS), all stock cabling.)</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23031:1Trident V1.1 / Buffalo III<table class="content postContainer_Alt" width="100%"><tr><td>What is especially telling is the freq of the peaks - very low. This seems induced. Any chance for pics of the rig under test?</td></tr></table>2015-08-26T20:55:50-07:002015-08-26T20:55:50-07:00Russ White<table class="content postContainer_Alt" width="100%"><tr><td>What is especially telling is the freq of the peaks - very low. This seems induced. Any chance for pics of the rig under test?</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23030:1Trident V1.1 / Buffalo III<table class="content postContainer" width="100%"><tr><td>When you measure the output of the regs while in the whole system you can't help but observe the whole system.</td></tr></table>2015-08-26T20:52:02-07:002015-08-26T20:52:02-07:00Russ White<table class="content postContainer" width="100%"><tr><td>When you measure the output of the regs while in the whole system you can't help but observe the whole system.</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23029:1Trident V1.1 / Buffalo III<table class="content postContainer_Alt" width="100%"><tr><td>igy - not arguing with you - just trying to find the cause. Ripple != oscillation. What you are describing is nothing close to normal operation - so I am just trying to help you find the cause. :)<br /><br />If you run a trident on it's own - with a dummy load - you will see it is self-stable. What I think is happening is you are seeing massive ground bounce (which of course local decoupling at the measuring point will remove)<br /><br />The why is a head scratcher - i can't duplicate it. Still thinking.</td></tr></table>2015-08-26T20:49:07-07:002015-08-26T20:49:07-07:00Russ White<table class="content postContainer_Alt" width="100%"><tr><td>igy - not arguing with you - just trying to find the cause. Ripple != oscillation. What you are describing is nothing close to normal operation - so I am just trying to help you find the cause. :)<br /><br />If you run a trident on it's own - with a dummy load - you will see it is self-stable. What I think is happening is you are seeing massive ground bounce (which of course local decoupling at the measuring point will remove)<br /><br />The why is a head scratcher - i can't duplicate it. Still thinking.</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23027:1Trident V1.1 / Buffalo III<table class="content postContainer" width="100%"><tr><td>Russ,<br /><br />I tried many-many combinations regarding the output noise. As I said, it's necessary and sufficient to connect the bitclock to reproduce the output stuttering. It is the same if I connect proper I2S input with bit- and frame clock and data lines. The stuttering noise is there, once there's bit clock, I guess that enables the dac output. <br /><br />Also, let me clearly state it. My Trident 3.0s _do_ have a ripple as the scope captures show in post #8. This is the case with all stock transformer, Placid HD, BIII, AVCC and Tridents, but no other components connected (here I mean without clock, I2S input or output stage, amp, etc.).<br /><br />Whether the Trident ripple/oscillation causes the stuttering noise when the source and amp are actually connected, I cannot definitely tell.<br /><br />However, what I can again definitely state, that both Trident ripple and the output stuttering noise goes away with the caps added to the Tridents.<br /><br />igy</td></tr></table>2015-08-26T19:52:00-07:002015-08-26T19:52:00-07:00igy137<table class="content postContainer" width="100%"><tr><td>Russ,<br /><br />I tried many-many combinations regarding the output noise. As I said, it's necessary and sufficient to connect the bitclock to reproduce the output stuttering. It is the same if I connect proper I2S input with bit- and frame clock and data lines. The stuttering noise is there, once there's bit clock, I guess that enables the dac output. <br /><br />Also, let me clearly state it. My Trident 3.0s _do_ have a ripple as the scope captures show in post #8. This is the case with all stock transformer, Placid HD, BIII, AVCC and Tridents, but no other components connected (here I mean without clock, I2S input or output stage, amp, etc.).<br /><br />Whether the Trident ripple/oscillation causes the stuttering noise when the source and amp are actually connected, I cannot definitely tell.<br /><br />However, what I can again definitely state, that both Trident ripple and the output stuttering noise goes away with the caps added to the Tridents.<br /><br />igy</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23025:1Trident V1.1 / Buffalo III<table class="content postContainer_Alt" width="100%"><tr><td>You actually should supply a true I2S signal - so that the data pin is not floating but you are truly sending silence.<br /><br />in other words - sending only a bit clock is nothing close to sending PCM slience. :)</td></tr></table>2015-08-26T15:36:16-07:002015-08-26T15:36:16-07:00Russ White<table class="content postContainer_Alt" width="100%"><tr><td>You actually should supply a true I2S signal - so that the data pin is not floating but you are truly sending silence.<br /><br />in other words - sending only a bit clock is nothing close to sending PCM slience. :)</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23024:1Trident V1.1 / Buffalo III<table class="content postContainer" width="100%"><tr><td>Tridents themselves do not oscillate - so I think what we are seeing is some external effect. Testing them in-situ does not really tell you much about the trident - just that you have something that is cause large supply spikes. I am wonder if some rapid mute un-mute activity is happening.<br /><br />You cannot just supply the bit clock - you must also supply a word clock. Otherwise the DAC does not know your word length.</td></tr></table>2015-08-26T15:31:38-07:002015-08-26T15:31:38-07:00Russ White<table class="content postContainer" width="100%"><tr><td>Tridents themselves do not oscillate - so I think what we are seeing is some external effect. Testing them in-situ does not really tell you much about the trident - just that you have something that is cause large supply spikes. I am wonder if some rapid mute un-mute activity is happening.<br /><br />You cannot just supply the bit clock - you must also supply a word clock. Otherwise the DAC does not know your word length.</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23023:1Trident V1.1 / Buffalo III<table class="content postContainer_Alt" width="100%"><tr><td>I always measured the Tridents assembled in the BIII. <br />The oscillation/ripple on Tridents were there without anything connected to BIII input/output, just installed in BIII and powered as ususal.<br /><br />On the output stuttering noise, there were two conditions needed to be met to reproduce it:<br />1. bit clock / lock (with/without actual i2s data lines connected noise was the same), until no lock, output was silent as expected<br />2. connected to amp, in my case Hypex NC400<br /><br />I tried directly connecting the amp to BIII output, and also in BIII-IVYIII-AMP setup, the result is the same. <br />Wire to amp had length of 10-20cm, stock cabling supplied with amp (shielded Mogami mic cable).<br /><br />I tried many things, isolating i2s input lines, output caps on IVY to break DC, etc. <br />Nothing helped. Then I started measuring trident outputs and found the ripples.<br /><br />I just installed the 22u caps on VDD_XO and DVCC, and then the output noise was also gone, so was the ripple.<br /><br />I can try to add/change (I guess rather replace? it's not in front of me) 27R to R4, though I'm not sure I've it lying around (especially in SMD), so it'll take some time to source it. BTW, I have had the noise issue with just the 2.8MHz bitclock fed in, so no higher bitrates at all...<br /><br />Anyway, I'm not sure what are we looking with this now:<br />- the oscillation on the Tridents<br />- or the noise on the output when connected to amp<br /><br />Do you think that if I increase VDD 1.2V current supply by changing R4, that would probably solve the output noise issue, which is currently "solved" with adding caps on the other two regs on VDD_XO and DVCC? </td></tr></table>2015-08-26T12:48:49-07:002015-08-26T12:48:49-07:00igy137<table class="content postContainer_Alt" width="100%"><tr><td>I always measured the Tridents assembled in the BIII. <br />The oscillation/ripple on Tridents were there without anything connected to BIII input/output, just installed in BIII and powered as ususal.<br /><br />On the output stuttering noise, there were two conditions needed to be met to reproduce it:<br />1. bit clock / lock (with/without actual i2s data lines connected noise was the same), until no lock, output was silent as expected<br />2. connected to amp, in my case Hypex NC400<br /><br />I tried directly connecting the amp to BIII output, and also in BIII-IVYIII-AMP setup, the result is the same. <br />Wire to amp had length of 10-20cm, stock cabling supplied with amp (shielded Mogami mic cable).<br /><br />I tried many things, isolating i2s input lines, output caps on IVY to break DC, etc. <br />Nothing helped. Then I started measuring trident outputs and found the ripples.<br /><br />I just installed the 22u caps on VDD_XO and DVCC, and then the output noise was also gone, so was the ripple.<br /><br />I can try to add/change (I guess rather replace? it's not in front of me) 27R to R4, though I'm not sure I've it lying around (especially in SMD), so it'll take some time to source it. BTW, I have had the noise issue with just the 2.8MHz bitclock fed in, so no higher bitrates at all...<br /><br />Anyway, I'm not sure what are we looking with this now:<br />- the oscillation on the Tridents<br />- or the noise on the output when connected to amp<br /><br />Do you think that if I increase VDD 1.2V current supply by changing R4, that would probably solve the output noise issue, which is currently "solved" with adding caps on the other two regs on VDD_XO and DVCC? </td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23021:1Trident V1.1 / Buffalo III<table class="content postContainer" width="100%"><tr><td>That noise in the wav sounds like the analog side picking up EMI from the digital inputs. It is very low freq (khz). how are you wiring the analog output? Pics?</td></tr></table>2015-08-26T11:54:38-07:002015-08-26T11:54:38-07:00Russ White<table class="content postContainer" width="100%"><tr><td>That noise in the wav sounds like the analog side picking up EMI from the digital inputs. It is very low freq (khz). how are you wiring the analog output? Pics?</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23020:1Trident V1.1 / Buffalo III<table class="content postContainer_Alt" width="100%"><tr><td>BTW DVCC and VDD-XO are not directly involved with the analog side at all. This is why I think what we are seeing is some ground bounce.<br /><br />Also be sure VDD (1.2V) trident is putting out enough juice - it is actually the most taxed reg on the board. You can add say 27R at R4 to bolster it's output current. The demand of that supply goes up substantially at high sample rates.</td></tr></table>2015-08-26T11:52:34-07:002015-08-26T11:52:34-07:00Russ White<table class="content postContainer_Alt" width="100%"><tr><td>BTW DVCC and VDD-XO are not directly involved with the analog side at all. This is why I think what we are seeing is some ground bounce.<br /><br />Also be sure VDD (1.2V) trident is putting out enough juice - it is actually the most taxed reg on the board. You can add say 27R at R4 to bolster it's output current. The demand of that supply goes up substantially at high sample rates.</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23019:1Trident V1.1 / Buffalo III<table class="content postContainer" width="100%"><tr><td>Trident expects a load. You should use a dummy load when measuring it. </td></tr></table>2015-08-26T11:40:01-07:002015-08-26T11:40:01-07:00Russ White<table class="content postContainer" width="100%"><tr><td>Trident expects a load. You should use a dummy load when measuring it. </td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23017:1Trident V1.1 / Buffalo III<table class="content postContainer_Alt" width="100%"><tr><td>Hi Russ, <br /><br />thanks for jumping in :)<br />I'd be happy to take further measurements/scope captures if you'd like to look into this issue, just tell me what/where to check.<br /><br />I started looking into this, because I got some stuttering noise at the amp outputs. However, it's sure was not caused by AVCC. Although it was also not clean, replacing the older AVCC (SRA2 1.0) with the most recent version (SR_1.0) did not solve this stuttering noise issue (even though the AVCC output is much better looking).<br /><br />The stuttering noise was gone when I added the 22u cap to DVCC and VDD_XO. I guess it was DVCC causing that noise. Their output is clean now, and the noise is gone. (I attach a wav with the stutter recorded, just to hear what it was like).<br /><br />Regarding EMI/HF ground loop. I'm not sure what/how to check for these. Everything was assembled simply on my desktop table, no case, no output connected, not connected to safety earth, stock trafo wired to placid hd (modified to remove the output ripple as described here in the forum, output clean), which is connected to buffalo iii dac with a ~10cm cable. The buffalo iii is v1.0.1, got the microcontroller removed, no other mods. I observed the same results at home and at my workplace, too. As input I use a dsp board (TI OMAP LCDK), but then to check I replaced it with a Papilio Pro FPGA board only outputting clock (no other lines connected), to make the buffalo locking. (I heard the noise at the dac output only when the dac locked). Nevertheless, the trident oscillaton was there without any input connected.<br /><br />Summing up, let me know if you'd like me to make some further measurements.<br /><br />Thanks,<br />igy</td></tr></table>2015-08-26T05:48:58-07:002015-08-26T05:48:58-07:00igy137<table class="content postContainer_Alt" width="100%"><tr><td>Hi Russ, <br /><br />thanks for jumping in :)<br />I'd be happy to take further measurements/scope captures if you'd like to look into this issue, just tell me what/where to check.<br /><br />I started looking into this, because I got some stuttering noise at the amp outputs. However, it's sure was not caused by AVCC. Although it was also not clean, replacing the older AVCC (SRA2 1.0) with the most recent version (SR_1.0) did not solve this stuttering noise issue (even though the AVCC output is much better looking).<br /><br />The stuttering noise was gone when I added the 22u cap to DVCC and VDD_XO. I guess it was DVCC causing that noise. Their output is clean now, and the noise is gone. (I attach a wav with the stutter recorded, just to hear what it was like).<br /><br />Regarding EMI/HF ground loop. I'm not sure what/how to check for these. Everything was assembled simply on my desktop table, no case, no output connected, not connected to safety earth, stock trafo wired to placid hd (modified to remove the output ripple as described here in the forum, output clean), which is connected to buffalo iii dac with a ~10cm cable. The buffalo iii is v1.0.1, got the microcontroller removed, no other mods. I observed the same results at home and at my workplace, too. As input I use a dsp board (TI OMAP LCDK), but then to check I replaced it with a Papilio Pro FPGA board only outputting clock (no other lines connected), to make the buffalo locking. (I heard the noise at the dac output only when the dac locked). Nevertheless, the trident oscillaton was there without any input connected.<br /><br />Summing up, let me know if you'd like me to make some further measurements.<br /><br />Thanks,<br />igy</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23012:1Trident V1.1 / Buffalo III<table class="content postContainer" width="100%"><tr><td>One thing to note - if your AVCC is oscillating it can cause some pretty horrible ground bounce - which will show up everywhere.</td></tr></table>2015-08-25T21:13:50-07:002015-08-25T21:13:50-07:00Russ White<table class="content postContainer" width="100%"><tr><td>One thing to note - if your AVCC is oscillating it can cause some pretty horrible ground bounce - which will show up everywhere.</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23011:1Trident V1.1 / Buffalo III<table class="content postContainer_Alt" width="100%"><tr><td>You may have some EMI or an HF ground loop?</td></tr></table>2015-08-25T21:07:46-07:002015-08-25T21:07:46-07:00Russ White<table class="content postContainer_Alt" width="100%"><tr><td>You may have some EMI or an HF ground loop?</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid23010:1Trident V1.1 / Buffalo III<table class="content postContainer" width="100%"><tr><td>Hmmm - can't replicate this - with a normal load I have almost immeasurable ripple on the output of the trident 3.<br /><br />Cheers!<br />Russ</td></tr></table>2015-08-25T21:07:08-07:002015-08-25T21:07:08-07:00Russ White<table class="content postContainer" width="100%"><tr><td>Hmmm - can't replicate this - with a normal load I have almost immeasurable ripple on the output of the trident 3.<br /><br />Cheers!<br />Russ</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid22970:1Trident V1.1 / Buffalo III<table class="content postContainer_Alt" width="100%"><tr><td>As promised, here're some pics from my Trident 3.0 regs, before adding extra caps at output, but after fixing placid hd ripple. This created some stuttering noise at the amplifier outputs, too.</td></tr></table>2015-08-19T06:36:21-07:002015-08-19T06:36:21-07:00igy137<table class="content postContainer_Alt" width="100%"><tr><td>As promised, here're some pics from my Trident 3.0 regs, before adding extra caps at output, but after fixing placid hd ripple. This created some stuttering noise at the amplifier outputs, too.</td></tr></table>urn:twistedpearaudio-com:ftPosts:st1:meid22969:1Trident V1.1 / Buffalo III<table class="content postContainer" width="100%"><tr><td>I posted a capture of the vdd_xo here: <a target="_blank" rel="nofollow" href="http://www.twistedpearaudio.com/forum/yaf_postst3657_12-5MHz-ripple-on-trident-3-0-supplying-XO.aspx" title="http://www.twistedpearaudio.com/forum/yaf_postst3657_12-5MHz-ripple-on-trident-3-0-supplying-XO.aspx">http://www.twistedpearau...nt-3-0-supplying-XO.aspx</a><br />Others had this with the 3.0, too: <a target="_blank" rel="nofollow" href="http://www.twistedpearaudio.com/forum/yaf_postst3456_Extra-capacitance-at-Tridents-out.aspx" title="http://www.twistedpearaudio.com/forum/yaf_postst3456_Extra-capacitance-at-Tridents-out.aspx">http://www.twistedpearau...nce-at-Tridents-out.aspx</a><br /><br />On my side, for dvcc and vdd were much nastier, at much lower frequency (few kHz). <br />I don't remember exactly the numbers, I can post some pics tomorrow when I'm back at work :) <br /><br />All those with the Placid HDs already modified to ged rid of the ripple on their output (http://www.twistedpearaudio.com/forum/yaf_postst3005_Ripple-at-output.aspx).<br /><br />I also had to AVCC ripple, too, but I rather ordered the most recent version there.</td></tr></table>2015-08-18T19:10:32-07:002015-08-18T19:10:32-07:00igy137<table class="content postContainer" width="100%"><tr><td>I posted a capture of the vdd_xo here: <a target="_blank" rel="nofollow" href="http://www.twistedpearaudio.com/forum/yaf_postst3657_12-5MHz-ripple-on-trident-3-0-supplying-XO.aspx" title="http://www.twistedpearaudio.com/forum/yaf_postst3657_12-5MHz-ripple-on-trident-3-0-supplying-XO.aspx">http://www.twistedpearau...nt-3-0-supplying-XO.aspx</a><br />Others had this with the 3.0, too: <a target="_blank" rel="nofollow" href="http://www.twistedpearaudio.com/forum/yaf_postst3456_Extra-capacitance-at-Tridents-out.aspx" title="http://www.twistedpearaudio.com/forum/yaf_postst3456_Extra-capacitance-at-Tridents-out.aspx">http://www.twistedpearau...nce-at-Tridents-out.aspx</a><br /><br />On my side, for dvcc and vdd were much nastier, at much lower frequency (few kHz). <br />I don't remember exactly the numbers, I can post some pics tomorrow when I'm back at work :) <br /><br />All those with the Placid HDs already modified to ged rid of the ripple on their output (http://www.twistedpearaudio.com/forum/yaf_postst3005_Ripple-at-output.aspx).<br /><br />I also had to AVCC ripple, too, but I rather ordered the most recent version there.</td></tr></table>