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Salas SSLV1.3 UltraBiB shunt regulator
Salas SSLV1.3 UltraBiB shunt regulator
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Old 22nd June 2018, 03:54 PM   #251
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Quote:
Originally Posted by Manolo47 View Post
Thanks Teabag!

So this is for my Ba-3 line stage build, so my output voltages are +24v and -24V.

Current output I do not know, but shouldn't it be less than 1A?

First question, well CC current needed in the B-a3 circuit?

And btw what does CC stand for? Current.....and the other C?

Rs,Cx and Cs recommended?

And in the positive and negative parts descriptions there are references to IRF9610, IRF9530, and IRF610 and IRF530. Is this so? I want to be sure this is not a typo.

Thanks!
CC=constant current

In the BA-3 thread they talk that preamp's bias. Its 45mA typically. So 90mA for two channels. Use 3.3R 1W R1 for 180mA CC to have enough spare and not too much heat on the reg's sinks.

Rs, Cx, Cs, values can't be recommended. That's an individual transformer and bridge diodes situation thing. Its either you have the Quasimodo gadget or other lab measurement ways to snubber the transformer's ringing or you don't use those parts.

Yes for below 1A CC you can use IRF9610 M1 in the positive and IRF610 M1 in the negative. IRF530 M2 in the positive and IRF9530 M2 in the negative are standard. The analogous fast Fairchild FQPs for M1 are good for 1.5A CC but also develop higher VGS.

In general, read the Ultrabib's build guide attached in post#1
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Old 22nd June 2018, 06:19 PM   #252
Marra is offline Marra  United Kingdom
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Salas SSLV1.3 UltraBiB shunt regulator
Quote:
Originally Posted by Salas View Post
http://ie.farnell.com/broadcom-limit...om%20red%20led

P.S. The above low power one says is consistent at circa 2mA (our circuit's working conditions territory). Same brand 6000 series measured best noise in member's "gerhard" noise tests. It might also prove sensitive for reliability because low power though? I don't know.
Thank you.
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Old 22nd June 2018, 06:46 PM   #253
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
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Originally Posted by Marra View Post
Thank you.
Alright. In the precautions section it says not to manually solder that type any closer than 1.59mm to its body. So populate it bit proud above the PCB. The FR4 is thick enough but some solder will flow to the upper side also through the plated holes.

http://www.farnell.com/datasheets/1918234.pdf
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Old 23rd June 2018, 09:33 PM   #254
Manolo47 is offline Manolo47  Puerto Rico
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Default Question regarding kingbright leds and bc327-40

Does the color matter? And it looks that digikey does not carry them, cannot find these in their site, maybe someone has been able to find it...

And the bc327-40 transistor appears with a bunch of suffixes after the number 40, like ta, hub, etc. does that matter? Thanks
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Old 23rd June 2018, 10:04 PM   #255
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
It should be red if you want the reg to reach at 5V low. Because red has lower Vf. If you don't need that low voltage and you go for >6Vout you can also use green amber yellow. Red tend to have best self noise as well but its not certain between brands. They are filtered by C2 along with the trimmer & VRR anyway. Mouser has the Kingbright flat profiled ones I think, which proved Vf consistent and reliable. But you can use any good brand low Vf LEDS.

The suffixes after 40 don't really matter to us. Maybe they mean kinked lead, ammo pack, bulk, etc.
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Old 23rd June 2018, 10:08 PM   #256
ggetzoff is offline ggetzoff  United States
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Salas SSLV1.3 UltraBiB shunt regulator
0623181404.jpg

Salas/Tea,

Received the minis and boards Thursday, and Ive been busy!

Cheers,

Greg
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Old 23rd June 2018, 10:22 PM   #257
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
P.S. If anybody will have to use Zener for Vref in place of VRR, the Vishay BZX55 series looks practical enough for this circuit. But remember to deduct 4.7V from its Vz (when with red LEDS). And also don't put the VR1 trimmer in the PCB of course. Say you want a 12V fixed UltraBiB with Zener, you put a BZX55 with 7.5Vz for example. 7.5+4.7=12.2V and so on and so forth. Zener orientation for both sections is described in the build guide.
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Old 23rd June 2018, 10:26 PM   #258
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
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Originally Posted by ggetzoff View Post
Attachment 688370

Salas/Tea,

Received the minis and boards Thursday, and Ive been busy!

Cheers,

Greg
Hi Greg,

First time I see a final PCB issue Ultra assembled. Looking cool in black. Well arranged, congrats. My two GB grade PCBs left America June 22.

P.S. Why R8 & R9 are missing?
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Old 25th June 2018, 12:08 AM   #259
Manolo47 is offline Manolo47  Puerto Rico
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Default LEDS

Could I use this led instead of the wp2773 ? wp937ggd with a v of 2.2 thanks
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Old 25th June 2018, 12:26 AM   #260
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Yes you can but the Vout range will bottom at somewhat over 5V. Maybe at 5.3V. If that's not a problem for your use, fine.
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