Salas SSLV1.3 UltraBiB shunt regulator

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O

organics1

Member
Joined 2011
jimk04 said:
You're welcome organic! They certainly are am elegant solution. Let's see if they suffice. I have a tiny fan that could help if needed but I don't really want to use it to keep it neat.

That was my main aim Nick, it has allowed me to squeeze in a transformer more elegantly.

I guess for those with a heavy metal wall of chassis to bolt to then nothing is gained with these but for me in this chassis I hope they come up trumps!

I shall try to fire one up soon and see if it melts!
Click to expand...
I'll be sniffing the wind.:LOL:
 
J

jimk04

Member
Joined 2018
Paid Member
No fumes were created!

Running R1=2.4r for 250ma ccs.to power an Abraxalito PhiDeca dac at 15v. Not 100pc sure what current the dac needs. I did try to measure but failed. Richard I think says it is 160ma max.

Powered up for about 3.5 hours tonight and reached a max temp of about 38degrees C. My IR gun told me similar.
Will get hitter in a chassis obviously but I think it is a success!
20220201_194528.jpg
 
J

jimk04

Member
Joined 2018
Paid Member
J113 tests.

I've just run a batch of these through my tester, the VdS was 7.6v as indicated on the display.
Is the mA figure the Idss? Seems very low but then the datasheet does state its idss is 2mA.
How do these tests relate to their associated R values for R4,7,8. All measure between 1.9 and 2.3.

thanks!
20220213_102040.jpg
 
J

JamesNZ

Member
Joined 2010
Hi, I'm planning to use a pre-regulator to feed DC to the ultrabib (I'm building a 2 chassis solution which will have transformer, rectification, caps + lesser regulator in one chassis, and the ultrabib and circuit it drives in the other chassis), I have a couple of questions about this:

1) I've read in past posts that when DC is input keep C1 on the ultrabib and it should be at least 100uF. Is there any benefit to making C1 larger when DC is input? E.g. I also have 470uF and 1000uF to hand, or should I be aiming for 100uF?

2) My pre-regulator will guarantee 18v, so I'm thinking based on the manual there should be no problem getting 15v output from the ultrabib... Is Vin - Vout = 3v OK when using DC input?

Thanks :)
 
Salas

Salas

diyAudio Chief Moderator
Joined 2002
Paid Member
Hi,

1) More than 100uF is no problem, maybe bit of a benefit actually, use what you got

2) 3V in-out will work up to a big current but 5V is recommended for a "stiffer" CCS

From the pdf build guide's last paragraph:

The reg works even with less than 5V difference because
CCmA weakening starts only at Vin-Vout <1.7V for ~200 CCmA settings. At 600mA CC it starts
weakening at Vin-Vout <2.5V. But more voltage space allows for mains play and for better M1's
parasitic capacitance.
 
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J

JamesNZ

Member
Joined 2010
Salas said:
2) 3V in-out will work up to a big current but 5V is recommended for a "stiffer" CCS

From the pdf build guide's last paragraph:

The reg works even with less than 5V difference because
CCmA weakening starts only at Vin-Vout <1.7V for ~200 CCmA settings. At 600mA CC it starts
weakening at Vin-Vout <2.5V. But more voltage space allows for mains play and for better M1's
parasitic capacitance.
Click to expand...
Thanks Salas - appreciate your work.

I'm aiming for ~ 300mA CC so I'm reading from the above that 3V Vin-Vout won't experience any weakening.
 
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