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Old 1st February 2013, 10:33 AM   #2631
Salas is offline Salas  Greece
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When Members post rubbish and the Moderators take no action, then what is one to do?

I have taken a step back for the last few weeks and I am seeing Rubbish and Lies being posted on this Forum and no one seems to take any heed !!!!!
Moderators are here not to scold members and not to vet technically but to keep the quality of discussion up and the noise down besides running janitor's chores. Technical accuracy is to be promoted by members civil exchange of facts. Your inadequate outburst yet again and the characterizations you use earn you the deployment of the recent mods team private warning to you about your long term conduct. I.e. 15 days in the bin and permanent moderation now with option for ban if you keep intimidating members by browbeat and offensive language. No matter who is right in tech nobody is a headmaster here. See rule #1.
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Old 1st February 2013, 11:45 AM   #2632
stajo is offline stajo  Sweden
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Originally Posted by darbost View Post
Hi all,

I've salas hotrodded dcb1 coming on the way with Antec transformer (2 x 15V, 50VA). I'm planning to set it to 600mA, but I'm not sure whether it's safe or not.
Any advice is highly appreciated.


Thanks.
Darbost, you'll be fine plugging it in. If you feel uncomfy with eventual heat or hum generated by the transformer at this load, then upgrade to 100 VA.



Staffan
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Old 1st February 2013, 01:12 PM   #2633
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I tormented the 78 VA tranny a bit more today. At 16,2 ohm load I get 16,9 VAC and 20,0 VDC. Thats 2*1,23 A, so about half its spec. It does not get warm (but load resistors do glow). I can now hear a very tiny hum with the ear close the tranny but thats nothing but normal.

I will run 4 cards and the goal is have it configurable for SE stereo, balanced stereo and 8 channel movie. If I go for the 10 ohm resistors it seems like I will end up on say 2*4*170 mA= 1360 mA total, about half the value that for the last half hour has tormented the loadresistors, and a quarter of the tranny-spec.

I'd say a 225 mA tranny that I was thinking to buy would mostly had contributed to more EMC in the case.

Well, testing with the real Mcoy is the final test but this seems like a plan. Now to glowbug/sand-matching.

Have a good day!
Staffan
When you get this finished can you post pics and maybe a schematic of your layout? And what kind of volume control/trim scheme will you use for the movie setup? I'm doing something similar (only 6 channels) and I'm very interesed in your project - not so much the balanced aspect but definitely the 8-channel.
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Old 1st February 2013, 01:22 PM   #2634
stajo is offline stajo  Sweden
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When you get this finished can you post pics and maybe a schematic of your layout? And what kind of volume control/trim scheme will you use for the movie setup? I'm doing something similar (only 6 channels) and I'm very interesed in your project - not so much the balanced aspect but definitely the 8-channel.
Will do. Plan is to use lightspeed *8. A friend had some PCBs but the optos was bad so I guess I have to buy a 100ish and match away. Anyone wanna sell some spare Silonex NSL-32SR2S from old matching?

Staffan
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Old 1st February 2013, 01:25 PM   #2635
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How will you do channel trim? Can you adjust each channel of the lightspeed individually as well as all eight channels simultaneously?
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Old 1st February 2013, 01:32 PM   #2636
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Do read up carefully about the LiteSpeed. It does have its followers but I was sadly disappointed with it.

Ladder attenuator was many times better. Litespeed adds colouration and distortions which a resistor ladder doesn't
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Old 1st February 2013, 01:42 PM   #2637
stajo is offline stajo  Sweden
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How will you do channel trim? Can you adjust each channel of the lightspeed individually as well as all eight channels simultaneously?
I dont know yet but I just build a plug for matching the SK170 toghether with the 5 glowbugs. If i upload pic here Andrew would shoot me point blank, but I will try to match the cards as decently as I can. Its also for learning. Teabag sent me very nicely matched SK170 for the buffer section, I have run them and they are on spot looking at each card per se but per card they differ between the cards from 0,72 to 0,85 (3 quadrupels is on 0,82 to 0,85 but one is on 0,72). Im to dumb to tell you if that will affect channel balance or not.

And after that its about matching the optos I guess. If you meen the "steering" of the lightspeeds they are, if I remember right, steered by 5 V and a pot so that shouldnt be a problem. I think :P

best
Staffan

Last edited by stajo; 1st February 2013 at 01:51 PM.
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Old 1st February 2013, 01:53 PM   #2638
stajo is offline stajo  Sweden
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Do read up carefully about the LiteSpeed. It does have its followers but I was sadly disappointed with it.

Ladder attenuator was many times better. Litespeed adds colouration and distortions which a resistor ladder doesn't
Thanks for the warning from both of you. The little I've heard from lightspeed I liked. Think about the cost of 8 ladders.

Staffan
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Old 1st February 2013, 02:00 PM   #2639
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Actually I'm not talking about compensating for differences in the cards, which are sure to be minimal, but matching front/center/surround/sub channels to compensate for room acoustics and differences in speaker efficiency, amplification, etc. My current setup requires around a 15dB range, and I imagine most setups will require something similar. I actually thought of putting a lightspeed in front of a ladder for this purpose. I like the lightspeed in the right application - in the wrong one it sounds dreadful. Deciding which is a matter of trial and error.
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Old 1st February 2013, 03:11 PM   #2640
stajo is offline stajo  Sweden
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Actually I'm not talking about compensating for differences in the cards, which are sure to be minimal, but matching front/center/surround/sub channels to compensate for room acoustics and differences in speaker efficiency, amplification, etc. My current setup requires around a 15dB range, and I imagine most setups will require something similar. I actually thought of putting a lightspeed in front of a ladder for this purpose. I like the lightspeed in the right application - in the wrong one it sounds dreadful. Deciding which is a matter of trial and error.
Havent thought so far. Subs have their own control, and spkrs might be controlled by the soundcard, if I dont go 4 ASIO or digital out. Dunno yet, gotta rebuild my mediacomp also. And the DA. And...

/Staffan
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