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-   -   Salas SSLV1.3 UltraBiB shunt regulator (https://www.diyaudio.com/forums/power-supplies/322411-salas-sslv1-3-ultrabib-shunt-regulator.html)

Marra 22nd October 2020 06:31 PM

The dc-dc convertor is supplied straight from the 6800uf cap as are the input and output relays.

PKI 22nd October 2020 06:33 PM

I do not have have an exact schematics for this board and al I know is from following the traces. I really regret going that way (having a board from a guy who did not provide a thematic). I did it mostly for having room to install poly caps. It looks like that DC-DC converter feeds before the regulator, right from the big C. However, it is gonna be more then 24V written on it. Well, filament voltage and current are stable :-)

PKI 23rd October 2020 01:15 AM

1 Attachment(s)
So I use big *** sink and the M1 M2 are barely warm, but still voltage drifts 2-3V down after 20mins. I know that it is not your layout and kinda feel bad asking it here, but anything else I can check before I go Zener option? Thank you!

Salas 23rd October 2020 07:05 AM

I hope its not oscillation. That, a scope should tell about. The GB board has different thermal absorption or spread.
Go with the Zener now to see.

P.S. What brand are the BC560Cs?

PKI 23rd October 2020 07:38 AM

All the parts are from the GB (maybe not caps as those were green). So for 24v 19.25v. Zener should be good regardless of Vin?

Salas 23rd October 2020 08:05 AM

Yes, circa 19V Vz sounds logical. Zeners have tolerances anyway. Preferably on the plus side of 19V in this occasion if it can be hand picked. But nominal Rail voltage precision for an analog preamp is not a crucial matter I would think. Especially when for single rail circuitry. Ballpark stuff will work as good.

Salas 23rd October 2020 08:18 AM

1N5249B-TR looks fit for the job. Needs little current as this circuit will provide it. You could also try a higher value C2 than used with the trimmer as long as it fits to can filter the lower impedance Zener better. Maybe decide C2 in the end after a comparison when the full preamp board is ready to be installed in its case.

PKI 23rd October 2020 06:53 PM

Thank you Salas you are most helpful as usual! I appreciate your helps a lot.

PKI 26th October 2020 02:05 AM

Quote:

Originally Posted by Salas (https://www.diyaudio.com/forums/power-supplies/322411-salas-sslv1-3-ultrabib-shunt-regulator-post6385575.html#post6385575)
1N5249B-TR looks fit for the job. Needs little current as this circuit will provide it. You could also try a higher value C2 than used with the trimmer as long as it fits to can filter the lower impedance Zener better. Maybe decide C2 in the end after a comparison when the full preamp board is ready to be installed in its case.

One more thing, do you think transformer with 24V or 22V secondary would be a better option (for 24Vout and 100-150mA)?

Salas 26th October 2020 02:43 AM

24VAC


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