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Salas SSLV1.3 UltraBiB shunt regulator
Salas SSLV1.3 UltraBiB shunt regulator
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Old 21st October 2019, 03:48 AM   #1781
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Quote:
Originally Posted by Gooch View Post
Ok, I finished my negative board and went to test is using a 22v transformer hooked, to my variac. Brought the power-up slowly while monitoring my DMM
and nothing happens the LEDs don't come there wasn't any smoke or burnt smell. I had 50 volts AC at the input even as I increased the voltage still nothing at the output. I did measure -5vdc at the pad of Cx and 5vdc on the other side. I see other builds have a resistor Rf but I thought you could just leave that out. Any thoughts

Thanks
Dave
You may choose not to use Rf (adds a little RC filtering for EMI) but you must certainly substitute it with a wire link then.
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Old 21st October 2019, 04:12 AM   #1782
Gooch is offline Gooch  United States
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Quote:
Originally Posted by Salas View Post
You may choose not to use Rf (adds a little RC filtering for EMI) but you must certainly substitute it with a wire link then.
Thank you Salas
I had the resistor for Rf installed it and test it real quick and everything was working. I post more as soon as I make some more progress.

Regards
Dave
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Old 21st October 2019, 06:08 AM   #1783
Harry3 is online now Harry3  Australia
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I'm sure 50Volts exceeds the voltage limit. Lucky you didn't have Rf in circuit.
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Old 21st October 2019, 05:35 PM   #1784
Gooch is offline Gooch  United States
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Quote:
Originally Posted by Harry3 View Post
I'm sure 50Volts exceeds the voltage limit. Lucky you didn't have Rf in circuit.
Yes it would have I should have wrote it different the 50 volts was what was at the variac out and transformer primary's the secondaries was 15 Vdc
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Old 27th October 2019, 12:12 PM   #1785
john jones is offline john jones  United Kingdom
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A question for Salas: I dont see you using a capacitance multiplier in any of your regulator designs, yet a capaitance multiplier is often used in other peoples' designs prior to the regulator. Is there a reason you choose not to use capacitance multipliers? Seems there is potentially a lot to gain in terms of ripple rejection and only a couple of volts headroom to lose. I would appreciate your comments (because I'm considering using one in front of your regulators).
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Old 27th October 2019, 02:40 PM   #1786
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Actually I use the principle in my series PSU designs.

DCSTB and L-Adapter have C-Mult as core. They do reduce current by 1+β (Hfe) through the R part of an RC filter with C situated at a transistor's base. Its a CCS but also working like a high R. Although the cap remains the same for RC time constant, effectiveness on ripple gets multiplied. Acting bigger since a given capacitance is to handle much less current than it would if not shielded by the beta.

Because loop feedback from the output to their Vref is not involved I call them stabilizers and not regulators in their build guides. Since input voltage changes are still not followed. They also utilize Sziklai output pair arrangements. Offering well lower & flatter Zo plots than typical C-Mults. The core topology is kinda hidden application-wise by the non typical properties as a whole.

In SSLV shunt types the input CCS is not only a useful limiter but filters also. CCS is a high impedance that nodes with Cout so RC. You may additionally use a capacitance multiplier before an SSLV but I don't recommend it post SSLV because it will mess up its Zo.
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Old 29th October 2019, 08:38 PM   #1787
PJN is offline PJN  United States
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Completed my DAC PSUs. the output stage pulled ~ 100 mA so I sized the +/- 15v boards for 200 mA each. I added some solid 1/4" x 2" x 5 1/2" aluminum as heat sinks for the PSU's, no room to do much else. After 1 hour with lid on they measure ~ 130 F, not cool by any means but a manageable temperature. I used 5K pots and they all adjusted easily to be spot on. Thanks for the great design Salas.

Paul
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Old 29th October 2019, 08:54 PM   #1788
Salas is offline Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Nice that you managed the build satisfactorily enough in the end. Does it play well also?
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Old 29th October 2019, 08:58 PM   #1789
PJN is offline PJN  United States
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Yes, it is an improvement, the Dac is more coherent now, no hint of glare. Smooth and detailed. Sounds great. AK 4493.
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Old 2nd November 2019, 12:49 AM   #1790
ggetzoff is offline ggetzoff  United States
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Nick,

i'm having a problem with a positive BiB. Nothing but mv output. I'm measuring .5 volts across R1, leds are lit. Good heat from devices but no voltage.

Thanks,

Greg
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