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Salas SSLV1.3 UltraBiB shunt regulator
Salas SSLV1.3 UltraBiB shunt regulator
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Old Yesterday, 11:50 AM   #781
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Quote:
Originally Posted by Malefoda View Post
Isn't 3xtotal-current (load+100mA shunt) enough as per guide? E.g. 1A@5V required so 3A*9VAC=27VA then a 9V@30VA?
Yes its enough so the Tx will be cool enough running. In full bridge rectification the Tx's AC current rating should be also derated by 40% or so. That parameter is already considered in our going easy and long life for the parts sizing approach. Constant current draw does not allow them time out in cycles anyway.
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Old Yesterday, 03:22 PM   #782
dewdrop is offline dewdrop  Singapore
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I plan to build +/- 5V shunts for the Soekris DAM 1121. Will need to find IDSS of <7.5mA for J3.

Will plan to use a 9V battery to connect to the drain and short the source and gate to ground. Do I need to connect a 100R resistor at the drain end?

Is the lower the IDSS value the better?
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Old Yesterday, 03:43 PM   #783
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
The lower IDSS value the less VGS (OFF) voltage which is our concern in this only 5V case for only that particular position. So it doesn't consume the better part of the little available internal voltage meant for other use when at 5V setting. As for how to measure IDSS all the usual techniques for sorting 2SK Toshiba types posted by builders in various threads do apply for any other JFET, also for our PFs. You either put the DMM in series mA mode between the battery and the drain to directly see IDSS or you infer it from voltage drop across the legs of some low value drain resistor. The second method is not prone to blow the DMM's internal fuse due to possible shorting mistakes when handling such tests. DMM grade fuses for properly protected against high energy accidents seriously made meters are expensive and most of the time not readily available in our spares box.
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Old Yesterday, 08:59 PM   #784
orelli is offline orelli  Italy
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Hi Nick, I made some UltraBib at 5V for my Buffalo Dac and Metronome upsampler,and they play outstanding, my previous volt regs was 1.2r.

Now I wish upgrade my FSP with this volt reg.


The R1x (ccs resistor) is 15R for about 40mA, what's the current that sink the circuit, and what the spare current?


I just build a prototype at 35V with Rccs at 15R with a load of 820R and it works . The VGS of M2 is 2.

I wish to low Rccs at 12 or 10R. Can I do it?
My heatsinks are at 10 C/W.


Thanks for another great design!
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Old Yesterday, 09:34 PM   #785
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
The formula for the UltraBiB CCS current is about 0.6V/R1. The regs in the FSP follow another formula, its (3LedsVF-Q1xVGS)/R1x. Usually 90mA for 15R. You can confirm by the voltage drop between R1x legs divided by 15R. Each FSP channel pulls 35-40mA (MC mode) rest is 50-55mA spare. If to substitute with UltraBiB when wanting to hear a real difference go for 150mA total i.e. R1=3.9R 2W. The sinks may get hot enough especially M2's because of 35V across it. The 110mA spare at 35V gives 3.85W M2 dissipation. Expect 60C+ sink temp in free air or 80C+ enclosed if with just 10C/W sink for M2. Better use a bigger one for long term reliability and a cooler box.
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Old Yesterday, 10:52 PM   #786
mige0 is offline mige0  Austria
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Quote:
Originally Posted by Dimdim View Post
I was (and still am actually) one of the lucky few that got to beta test Salas' new baby.

This thing is remarkable.

Click the image to open in full size.

When we swapped it in place of the BiB 1.1 in my Soekris, the improvement was immediately obvious and not subtle.
Is there a reason you solderd the MUSE elevated from the board?
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Old Today, 08:59 AM   #787
Dimdim is offline Dimdim  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
The only reason was to make it easy to swap them out to try other capacitors.
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