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Old 16th October 2012, 06:05 PM   #1841
Salas is offline Salas  Greece
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The schematic is OK. Shows an optional Zener also that may had tricked you. Objectively yes, OSCON is a good filter. Subjectively not my preference there.
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Old 22nd October 2012, 02:16 PM   #1842
ombudsmann is offline ombudsmann  Germany
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Default Red LEDs not lit

Hi all,

I just happen to be in the middle of a SSLV1.1 board PSU build for a standard Pass B1 Buffer PCB (the original from Pass Labs). Target voltage is +18V single rail.
I already built one successfully for my phono pre-amp and had no issues at all. But for this one, the two red LEDs in the voltage reference area do not light up. The 4 green LEDs do. I used the calculator to get the right parts (although I don't really know the load current), used 15R/5W for R301, 2 Wima Mks 4,7 uF Caps for C303 and C301, 1K8 for R303 and a Bourns W502 5K trimmer. D301 jumpered. I used BYV28-200 diodes for D311-314 as rectifier that I had lying around (instead of the MUR120). Nichicon Gold Tune 4700uF 100V as C305 (polarity is correct)
I had no visible signs of bad soldering, so I thought it would be good to build a second board with a different set of parts to be sure there is no bad part involved (I had a second board and IRF+ set on hand). Unfortunately with the same result.
Since building a shunt regulator with Salas and teabags boards for a B1 has been done loads of times in the community, could anyone give me a hint where I went for the wrong path?

Any help appreciated,

cheers
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Old 22nd October 2012, 02:33 PM   #1843
roender is offline roender  Romania
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Most probably you are exceeding the CCS current with the load needed current, hence running into no juice for the shunt FET transistor.
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Old 22nd October 2012, 03:12 PM   #1844
ombudsmann is offline ombudsmann  Germany
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Thanks for the suggestion. That means lowering the value for R301 would do the trick?
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Old 22nd October 2012, 03:18 PM   #1845
Tea-Bag is offline Tea-Bag  United States
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SSLV1.1 builds & fairy tales
I think the IRF9530 might be shorted. Measure voltages there, and all the T0-92 devices.
15R @ 18v should work, but 10R might be better if Roender is right.
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Old 22nd October 2012, 03:22 PM   #1846
Salas is offline Salas  Greece
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What is the dummy load used? That will say something certain about the set current sufficiency.
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Old 22nd October 2012, 03:26 PM   #1847
ombudsmann is offline ombudsmann  Germany
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The dummy load is 1R. Thanks for your quick response, amazing service!!!
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Old 22nd October 2012, 03:29 PM   #1848
Salas is offline Salas  Greece
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1R is effectively a short circuit. Thumbs up if with 2 surviving regulators, but to simulate a B1 make that 1K 1W.
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Old 22nd October 2012, 03:34 PM   #1849
ombudsmann is offline ombudsmann  Germany
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Seems like we have found a source for my issues: myself. Thanks for your help, will see what I can rescue....

best
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Old 22nd October 2012, 03:38 PM   #1850
Salas is offline Salas  Greece
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The CCS normally saved you with current limiting. Just try with 1K dummy to confirm.
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