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Old 2nd August 2011, 07:10 PM   #121
Salas is offline Salas  Greece
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Quote:
Originally Posted by mravinsky View Post
If you are speaking about my measurements, they were with 4.7R resistors, because the departure point was about 2V, nothing like 1.49 or 1.1V. (In fact I have ordered lower values to test, but I suspect that it could be difficult to arrive to 400-450mA and 600-625mA for buffalo+tridents almost impossible with this configuration)
Iīve tested with theoretically yellow 2.4V Leds, but the reading for this strings (3 Leds) is also 5.7V, I donīt know why.
Try with mixing one blue Led and I will try too so to see if it has any real negative impact on noise or not.
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Old 2nd August 2011, 07:15 PM   #122
Salas is offline Salas  Greece
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Originally Posted by manamanam View Post
Just checking its limits in case that the I/V draws more current.
On the manual it says that it draws a constant current of 350mA.
So i will finalize settings when i measure the real thing.
100mA on top of consumption is enough?
I don't know about buffalo to expertly tell you. You will see in practice.
I am looking on some noise measurements, and mixing one 3V9 0.5W Zener or a blue Led with the other two, looks safe by the way. Better the blue, the Zener will need reverse orientation and we don't know if it will be that stable without strong current.
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Old 2nd August 2011, 07:29 PM   #123
qusp is offline qusp  Australia
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I have used blue in dcb1 and mixed in SSV1 with no negative impact on noise, audible noise anyway
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Old 2nd August 2011, 07:34 PM   #124
qusp is offline qusp  Australia
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btw the actual current draw for the analogue supplies of the sabre is only 100ma total for 5 supplies (mixed 3v3 and 1v2, so its not 330mW), including a 100mhz XO. thats some pretty serious overhead on the tridents?

Last edited by qusp; 2nd August 2011 at 07:37 PM.
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Old 2nd August 2011, 09:27 PM   #125
Salas is offline Salas  Greece
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Quote:
Originally Posted by qusp View Post
I have used blue in dcb1 and mixed in SSV1 with no negative impact on noise, audible noise anyway
Thanks for the input. 3xblue can be too much voltage though, I would mix just one firstly.
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Old 3rd August 2011, 10:20 PM   #126
mravinsky is offline mravinsky  Europe
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I havenīt found blue leds (smaller than 5mm) in my city. So, I must wait.
I can achieve 433mA in my neg 15v regulator using a 1R1 resistor.
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Old 4th August 2011, 02:02 AM   #127
Salas is offline Salas  Greece
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That should be enough. Measure the actual current draw of the load on the negative rail. Don't push the idle dissipation if it suffices for 100mA+ margin.
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Old 4th August 2011, 02:47 PM   #128
mravinsky is offline mravinsky  Europe
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To Salas and people concerned in Buffalo ii+ Tridents and Legato. Iīve never measured the current draw, because my first exerience with Trident was the my PS then,(Placid 350mA) gave not enough current to lite the leds in local AVCC and Tridents. Then I gave as good what I read in forums: idle current for Buffalo+tridents 450-475mA and 300 mA for Legato.
Today I have measured the idle current with the following results:
Buffalo + Tridents: 410mA
Legato 2 and 3.1 (without Buffers):Between 190 and 200 mA.
So thatīs the departure point (for me)
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Old 4th August 2011, 04:58 PM   #129
Salas is offline Salas  Greece
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So it draws 200mA per rail for the +/-15V rails. Setting the 15V regs CCSs at 350mA is royal.
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Old 4th August 2011, 07:02 PM   #130
albertob is offline albertob  Spain
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Hi Salas
I'm riding a version for 5.25 V output with ccs 470 ma. I think I've managed with R1 3R3 and R305 1k trimmer (jumper r303). Through r1 I have 1.55v and 5.25v in the output .. good!

My guess is that with R1 3R9, the maximum voltage at the outputs is 4.9 v. Although r305 (trimer) rises above 300 ohms. However, with R1 3R3 I can get with the trimer (1k) the 5.25 volts I want.

This ok?

Thanks!
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