The simplistic Salas low voltage shunt regulator - Page 558 - diyAudio
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Old 23rd November 2012, 03:34 PM   #5571
Salas is offline Salas  Greece
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Quote:
Originally Posted by didiet78 View Post
New reflektor Circuit using bipolar or Just use Bipolar Library for Mosfet? If later, it got wrong pinout. Drain M1 connect to Drain M2.

Didiet
Bipolar library was. MOSFETS used are GDS for pins as we face them from left to right. I will look into it.
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Old 23rd November 2012, 03:41 PM   #5572
Salas is offline Salas  Greece
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Quote:
Originally Posted by alibear View Post
Hi all, is there a formula to calculate the heat sink size to accomodate both IRFP9240 transistors when using a version 1 circuit.
Thanks for your help
Alan
You got to calculate dissipation for each one, then the rise above ambient for total dissipation on a given sink, then add the thermal resistances case to junction and about 1W/C case to sink, looking to stay under 100C for junctions. 70-85C for junctions would be very long time safe.
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Old 23rd November 2012, 10:55 PM   #5573
tinitus is offline tinitus  Europe
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Salas, I have question

looking at ordering parts for the Reflektor reg

is voltage too high to use 2sk170 instead of 2sk117 ?
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Old 23rd November 2012, 11:52 PM   #5574
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The JFET is going to have about 35V across in your case. K170 has 40V max. Make R4 120R if it will be a BL range to save the JFET some dissipation. I prefer the K117 for it being less capacitive and 50V rated. But both can do, except than in the odd input over-voltage of course.
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Old 24th November 2012, 08:13 AM   #5575
tinitus is offline tinitus  Europe
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will see if I can get some k117
or use heatsink with the k170
ok, thanks

edit, I have found and bought a few 2sk117, if all goes well
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Old 25th November 2012, 04:32 PM   #5576
Furax is offline Furax  France
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Hi there ! I am a little bit lost in the ...558 page of this thread ! I am looking for 2 power supply: 5V/ 250mA and 5V / 100mA for my DAC (a TOTALDAC). Welle, do you have a link to a page for a good incarnation of your design in this range of tension and current?
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Old 25th November 2012, 05:19 PM   #5577
Salas is offline Salas  Greece
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Look in SSLV1.1 builds thread for something plausible with pcb etc. Here is an ongoing ideas and tests and questions thread with enough yrs of stories.
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Old 28th November 2012, 12:53 PM   #5578
E30NA is offline E30NA  Denmark
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Is it possible to build a 12v 2a version of this PSU?
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Old 29th November 2012, 07:35 AM   #5579
AndrewT is offline AndrewT  Scotland
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I don't know what you have in mind, but those numbers will impose certain dissipations in the Salas Style Shunt Regulator.
First, the 12V output will require a nominal 19Vdc including quite a bit of ripple.
Second, this in turn will result in a range of input voltage of 17Vdc (absolute minimum) to 19Vdc.
Third, 2A of output will likely require at least 2.03A of input.
Fourth, 19V * 2.03A gives a maximum dissipation for the whole regulator of 38.6W.
Fifth, you have to get rid of that heat using heatsinks.

I would not use a Shunt regulator for this duty, I recommend a series regulator.
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Old 29th November 2012, 07:49 AM   #5580
E30NA is offline E30NA  Denmark
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Thanks for the quick reply.

Ok, i can see that there are to many compromises by using this PSU then. I am looking around for a better PSU for my DAC Magic Plus, and just gathering information and ideas. DDAC have recomended me to try his PSU Construction, and i am leaning to that sollution. But i want to keep my options open before i make my decission on what PSU to choose.
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