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Salas SSLV1.3 UltraBiB shunt regulator
Salas SSLV1.3 UltraBiB shunt regulator
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Old 18th August 2019, 02:49 PM   #1691
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
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Originally Posted by Alypius View Post
Just getting started with my spiffy new UltraBiB boards! In the spirit of DIY, I'm going through my inventory of bits and I have a few 10kuF/63V caps. Is there any issue using those for C1? I know the guide calls for 6800uF/50V; I'm running two 24+24 transformers for a dual-mono BA-3 preamp, so the current isn't going anywhere near 1A. I don't think upping C1 to 10k will harm anything, but I'd like the expert confirmation. Thanks!
Its OK to use a bigger reservoir capacitor when you have it.
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Old 18th August 2019, 05:57 PM   #1692
manniraj is online now manniraj  India
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Originally Posted by Salas View Post
Check R5 R6 are the right value. The drop across R5 is also Q2's Vbe and its very little. Replace Q2 Q3 J2 to make sure.
I replaced the Q2,3 with 550C and J2 from my spare positive board kit P5102. Checked R5,6 and they are as per spec 270R. Still the voltage is stuck at -9.9vdc. Below are the readings for your reference.

Vbe across q4 = 1v
Vbe across q2 = 0.34v
Vbe across q3 = 0.51v
Vbe across q1 = 0.56v
Voltage drops on R5 = 0.14v
Voltage drops on R7 = 0.29v

Last edited by manniraj; 18th August 2019 at 06:01 PM.
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Old 18th August 2019, 08:15 PM   #1693
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
How much is the voltage drop across R1's pins? How much is the raw DC voltage across C1's pins?
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Old 19th August 2019, 01:42 AM   #1694
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Salas SSLV1.3 UltraBiB shunt regulator
You might want to check for cold solder joints for the caps because of the thick copper ground trace. Worthwhile to go through these again.
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Old 20th August 2019, 01:00 AM   #1695
manniraj is online now manniraj  India
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Originally Posted by Salas View Post
How much is the voltage drop across R1's pins? How much is the raw DC voltage across C1's pins?
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Originally Posted by dewdrop View Post
You might want to check for cold solder joints for the caps because of the thick copper ground trace. Worthwhile to go through these again.
Thanks guys will check that over the weekend and report back.
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