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Salas SSLV1.3 UltraBiB shunt regulator
Salas SSLV1.3 UltraBiB shunt regulator
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Old 11th September 2019, 02:44 AM   #1741
deafbykhorns is offline deafbykhorns  United States
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Its 120hz
C1 is only 1v above Vout so xfrmr must be giving up
Must of been a late night, just noticed I tapped it wrong (5v instead of 10vac out)
Thanks
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Old 11th September 2019, 02:55 AM   #1742
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
No worries, let us know how it came up in the end
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Old 11th September 2019, 11:49 AM   #1743
deafbykhorns is offline deafbykhorns  United States
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Retapped xfrmr, sawtooth gone but still have about 36mvac of ripple
WaveIO must not like it because computer still not recognizing it. Works fine using USB power.
Using 1K at R9 because of the load, C1 is 6800u

Last edited by deafbykhorns; 11th September 2019 at 11:52 AM.
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Old 11th September 2019, 11:58 AM   #1744
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
What frequency is the 36mV ripple? Is it there on the output even when the reg isn't connected to that load? How long is the cabling to the load? Does it have any local decoupling small caps? Other Ubib builds work in the particular application?

P.S.
Much or suboptimal spare current can upset matters if delicate. Play with the CC allowance for experiment. 1.5 Ohm first, then 1 Ohm R1.
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Old 11th September 2019, 10:02 PM   #1745
deafbykhorns is offline deafbykhorns  United States
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Freq was 30hz, rearranged my breadboard and now 3mv. Using 1.2 ohm resistor now at 500ma. R9 is 1K
Everything working now, time to get busy and put this in a chassis and clean things up some. Going to increase xfrmr to at least 80va, I think the 25va is a little small and may be making the BIB sensitive to changes.
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Old 11th September 2019, 11:46 PM   #1746
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Hmm the sub mains frequency and the drastic value change with breadboard rearrangement rather hints to interference. Do check again in the end. Did you measure the actual load's consumption?

When probing on some weird frequency indications, a crude verification method is power off and see if still there picked from somewhere. Common mode noise couples to non differential measurement loops. Don't forget to use the short ground coil on the probe's nose than the crock wire, but you already know that.
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Old 13th September 2019, 06:20 PM   #1747
altsouza is offline altsouza  Brazil
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Hi,
Can I power Project Pre Dac S2 with ultrabib??
Thanks
Antonio
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Old 13th September 2019, 07:04 PM   #1748
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Its included outboard PSU is 5V/1A rated. Technically you can, but the shunt idling as high its going to produce much heat. I would try with the L-Adapter first.
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Old 13th September 2019, 07:39 PM   #1749
altsouza is offline altsouza  Brazil
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Quote:
Originally Posted by Salas View Post
Its included outboard PSU is 5V/1A rated. Technically you can, but the shunt idling as high its going to produce much heat. I would try with the L-Adapter first.
Thanks
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Old 14th September 2019, 05:34 PM   #1750
shattered_dream is offline shattered_dream  Germany
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Hmmm is a heatsink temperature of 46C ok?
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