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Old 19th February 2013, 11:17 AM   #1351
RollE2k is offline RollE2k  Sweden
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Although with salas shunt, it's recommended to shunt at least 70mA on top of load, and more seems better. So i would go for around 100mA with your SEN.
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Old 19th February 2013, 01:11 PM   #1352
EUVL is offline EUVL  Europe
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If it should need 70mA extra to drive a 35mA load, then maybe you should consider using something else, like Walt Jung's shunt.


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Old 19th February 2013, 01:35 PM   #1353
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For the moment I'm only making tests.
But I think that I'm not making an eco friendly I/V because a resistor I/V is better to save the energy of the planet.
For now the problem to solve is to obtain low noise and after I'll try other shunt configurations.
Thanks and I'll keep you informed.
Ciao
Guglielmo
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Old 19th February 2013, 01:48 PM   #1354
EUVL is offline EUVL  Europe
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> a resistor I/V is better to save the energy of the planet

Then use batteries followed by a passive LC filter.


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Old 19th February 2013, 02:00 PM   #1355
NicMac is offline NicMac  Italy
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and

>For now the problem to solve is to obtain low noise

Then use batteries followed by a passive LC filter
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Old 19th February 2013, 05:48 PM   #1356
RollE2k is offline RollE2k  Sweden
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Quote:
Originally Posted by EUVL View Post
If it should need 70mA extra to drive a 35mA load, then maybe you should consider using something else, like Walt Jung's shunt.
Of course you can shunt less, but as usual performance is better the more you shunt (as long as you can cool it).
But the minimum current of SSLV1.1 in original design is 100mA if i'm right, but you can always change some fets to lower it.
It's just as simple as performance vs power-usage/heat.
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Old 19th February 2013, 07:13 PM   #1357
NicMac is offline NicMac  Italy
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> It's just as simple as performance vs power-usage/heat.

Even if this is the wrong thread I'm curios towards the validity of this postulated "simple" correlation between performance vs power usage.

1) Is it true for a constant current loads?
2) What is the correlation coefficient? You get 10% or 0.001% better performance by doubling the power usage?

curios minds want to know....maybe I should ask Salas
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Old 23rd February 2013, 09:09 PM   #1358
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when using sen Is not It better to have a lower Idss jfets In lower pair - ccs
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Old 24th February 2013, 05:28 AM   #1359
EUVL is offline EUVL  Europe
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No.
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Old 24th February 2013, 06:44 AM   #1360
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Good morning Patrick from sunny Alicante - I say, you're an early riser on Sunday

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