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Salas SSLV1.3 UltraBiB shunt regulator
Salas SSLV1.3 UltraBiB shunt regulator
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Old 4th July 2019, 01:55 AM   #1571
yunyun is offline yunyun
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Quote:
Originally Posted by Salas View Post
Or it was a partial short allowing few spare mA for the shunt voltage section to appear working well before loaded
I once mistakenly inserted the 3.3V Regulators into the 1.2V position on the Buffalo and plugged the 1.3V Regulators into the 3.3V position on the Buffalo. As a result, the 5V power supply drops to 1V. Fortunately, Buffalo has a protective design, otherwise Buffalo has been damaged.
b3sepro28.jpg
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Old 11th July 2019, 03:31 PM   #1572
JOIMONF is offline JOIMONF
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Salas SSLV1.3 UltraBiB shunt regulator
I would try powering a class A amp using Ultrabib, the project is a high voltage version of ACA Pass amplifier. Now I must order the transformers. Each ACA-channel needs approx. 24VDC input voltage rated at 1,6A.
I think is a must double mono tr. as in DCB3 preamp but a greater 100w. core or maybe more 120w core??.
No idea what voltage for Ultrabib to produce 24v. DC.
As rectifier I will use an active bridge based on LT4320, which is a "low-drop" rectifier.
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Old 11th July 2019, 05:06 PM   #1573
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Depends not only on bridge losses but also on how much ripple voltage loss is going to be created. 24VAC trafos and 10mF C1 or higher would be a safer bet. M1 should be IRF9630 since you must run high Amperage CC. 120VA is a good choice as well. Fuse the primary side as indicated by the transformers manufacturer.
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Old 11th July 2019, 09:12 PM   #1574
derekr is offline derekr  Barbados
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Finished converting a balanced Soekris 1121-based DAC powered by multiple DIYINHK LT3045 power supplies to power via three UBiBS a few weeks ago.

From the beginning there was a noticeable improvement in sound quality overall - especially top to bottom resolution and soundstage width. Lyric intelligibility is also improved. After several weeks Iím still smiling hours after sitting down to listen so felt I should give credit where itís due.

And, to (mis)quote someone Ď... you should let people know that SOTA LDOs can be bettered by UBiBsí. They certainly improved that DAC. Thanks, Salas, for a benchmark power supply.
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Old 11th July 2019, 09:43 PM   #1575
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
You are welcome. Very nice that you had better long term subjective success with the UBiB shunts than with top notch LDO based PSU alternatives. Congratulations.
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Old 11th July 2019, 11:01 PM   #1576
JOIMONF is offline JOIMONF
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Salas SSLV1.3 UltraBiB shunt regulator
Thanks Salas, I will take into account.
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Old 12th July 2019, 10:44 PM   #1577
JOIMONF is offline JOIMONF
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Salas SSLV1.3 UltraBiB shunt regulator
Salas, for high amperage cc, how much low can go R1?
And may I expect more than 2w disipation??
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Old 12th July 2019, 11:00 PM   #1578
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
In your case for say 1.75A CC you should use 0.33R R1*. It will dissipate 1W so use a 3W-5W resistor. Rule of thumb is choose at least three times higher nominal than their dissipation for passive parts. Not to become truly hot i.e. untouchable and dangerous.

*You know the formula, its CC=Vbe/R1. In this circuit no more than 0.6V/R1, usually 0.58V Vbe in average after warmed up as reported by the builders. 0.58V*1.75A=1W R1 dissipation.
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Old 13th July 2019, 09:31 PM   #1579
JOIMONF is offline JOIMONF
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Salas SSLV1.3 UltraBiB shunt regulator
Lets see.. so.. R1= Vbe (0,58) /CC (1,75)= 0.33R
Ok., and power from 3 to 5w. Ok.Ok.
thanks kind response, Jordi
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Old 14th July 2019, 09:18 AM   #1580
nano35 is offline nano35  Hong Kong
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Amplified Parts
This shop in AZ, USA has PF5102 in stock but I am asking them to make sure.
$0.4/pc.
Hope we don't swipe clean their stock
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