The simplistic Salas low voltage shunt regulator - Page 463 - diyAudio
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Old 9th November 2011, 08:22 AM   #4621
back is offline back  Greece
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i can`t find 2.7C/WATT heatsink so i will the case as heatsink.

i think it will do the trick.

the case worked great as heatsink.
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Old 9th November 2011, 08:39 AM   #4622
massimo is offline massimo  Italy
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It buffers the termination not to change the OLG shape and bandwidth due to a shunting local decoupler, and that RC with just 100R does not drop too much itself. Lower value it starts interfacing too much.
Some dacs require 3.3V/30mA. In that case 100 ohms means dropping 3V or nearly 90%.
What about 47 ohm ?
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Old 9th November 2011, 09:28 AM   #4623
Salas is online now Salas  Greece
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What keeps from setting as much extra voltage initially as required to drop? If its a matter of using original transformers, then you don't do the RC filter buffering and the reg will just slow down on a heavy chip decoupling capacitor, rarely there will be functionality problems. At least we never heard any of the versions in this thread refusing a DAC or chip by oscillation. Still they did a decent job. Down to 10R RC its still working, you just lose some of the extra filtering benefit and just a little original spec, to answer your initial question.
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Old 9th November 2011, 09:45 AM   #4624
AndrewT is offline AndrewT  Scotland
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Originally Posted by Salas View Post
Remember, only the top one to change. It should be twice the Vgs spec of K170 at least and give higher free IDSS than the K170 under it so to best cascode.
the Cascode voltage, i.e. the Vgs of the outer device, should be at least 2times the Vp of the inside device.

A low Vp device for the inner Tr, allows a lower cascode voltage
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Old 9th November 2011, 10:39 AM   #4625
massimo is offline massimo  Italy
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Originally Posted by Salas View Post
What keeps from setting as much extra voltage initially as required to drop? If its a matter of using original transformers, then you don't do the RC filter buffering and the reg will just slow down on a heavy chip decoupling capacitor, rarely there will be functionality problems. At least we never heard any of the versions in this thread refusing a DAC or chip by oscillation. Still they did a decent job. Down to 10R RC its still working, you just lose some of the extra filtering benefit and just a little original spec, to answer your initial question.
My case (roughly): Xfrm 9VAC > 12 VDC > Pi filter drop 2 V = 10 VDC shunt input
Shunt reg v1.1 (BiB) set for 4 Vout > max R drop 0.6-0.7V@30 mA = R 20 ohm
Caps near IC: 680uF // 2.2uF
Is this acceptable?
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Old 9th November 2011, 11:16 AM   #4626
Salas is online now Salas  Greece
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Spice says yes.
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Old 9th November 2011, 11:26 AM   #4627
massimo is offline massimo  Italy
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In Spice we trust!

Thank you!
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Old 9th November 2011, 11:30 AM   #4628
Salas is online now Salas  Greece
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Even Sting fought over spice matters. Should be worthy.
Attached Images
File Type: jpg dune.jpg (248.1 KB, 470 views)
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Old 9th November 2011, 11:41 AM   #4629
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Dune?! Haha!
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Old 9th November 2011, 11:44 AM   #4630
Salas is online now Salas  Greece
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''He who controls the spice controls the universe''. Seminal Sci-Fi film, yes.

Dune Trailer - IMDb
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