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Salas SSLV1.3 UltraBiB shunt regulator
Salas SSLV1.3 UltraBiB shunt regulator
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Old 22nd March 2019, 07:17 PM   #1311
Dimdim is offline Dimdim  Greece
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Almost 4 Ampere constant current setting! Now that's some real dedication to run the Raspberry Pi 3 computer from a shunt regulator
That 50VA traffo must be having a pretty bad time, though.. :P
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Old 22nd March 2019, 07:29 PM   #1312
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
Probably running both 9V secondaries in parallel?
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Old 23rd March 2019, 07:26 AM   #1313
nano35 is offline nano35  Hong Kong
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Probably running both 9V secondaries in parallel?
yes, 2x9Vac connected in parallel
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Old 23rd March 2019, 05:38 PM   #1314
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Understood ; thank you for the detailed answer. And yes, ear, unfortunately, is directly tied to a complex processor; nothing they render can be trusted in terms of test results or quality.

Instant switching of sources of sound with identical amplitude @1Khz , with less than 10ms silence between source changing and no pop's is the only way we could observe differences.

Is very important in comparison to have the sound sources identical in amplitude otherwise our brain would prefer the music that is a little bit(~2-3db) louder .

Along with a good friend we used this method for comparing sound sources.

Findings are that unless is devised a solid way of testing/compare sound sources, ears are mostly useless and are influenced on how much we spent on equipment (not only money but also time and emotional investment).
I say this, because i proved to my friend (and later him to me) that we liked more the sound of a different device although when using the proper testing method (by not allowing brain to add the emotional color) as described above they sounded identical or even worst.
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Old 25th March 2019, 12:04 AM   #1315
Spartacus is offline Spartacus  United Kingdom
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Hello Salas, I've recently been using one of your shunts to power my AK4495 DAC. However on switch-on I am getting switch on spikes of a few volts higher than the set voltage, before coming down.

I'm running it at 5V, but with the standard 220uF reference cap, it spikes up to 7.9V. Adding an extra 470uf in parallel, it now spikes at 7.0V, which is safe. I changed the 0r33 resistor on the input to 10V, but that didn't help.

The regulator sounds great - better than the Paul Hynes shunt that it replaced - so it's obviously working well. The LEDs are at normal brightness, so reference current looks normal. Any ideas what I should check?

Thanks,
Dan

Last edited by Spartacus; 25th March 2019 at 12:15 AM.
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Old 25th March 2019, 12:34 AM   #1316
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
It normally tests softly without an over voltage peak on single event capture mode when the digital scope is set to very slow. So that's an odd occurrence. Does it do it on a resistor dummy load as well? Can you verify? Trying to firstly understand if it's a malfunction or a momentary oscillation with a particular client circuit. So to analyze for helpful ideas.
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Old 25th March 2019, 01:24 AM   #1317
Spartacus is offline Spartacus  United Kingdom
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It behaves the same with or without load.

I did find I had 270R in R9 - just changed it to 680R (the closest higher value I had) and while the spike is still there, the voltage does ramp up more slowly, up to about 3V, then rises sharply to 7V before dropping down to 5V.

Is it worth going to 1K for R9?

Last edited by Spartacus; 25th March 2019 at 01:39 AM.
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Old 25th March 2019, 01:49 AM   #1318
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
How much spare current you set?
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Old 25th March 2019, 01:52 AM   #1319
Salas is online now Salas  Greece
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Salas SSLV1.3 UltraBiB shunt regulator
What C3 type you use?
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Old 25th March 2019, 02:00 AM   #1320
Spartacus is offline Spartacus  United Kingdom
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Around 85ma spare current.

C3 is Nichicon bipolar from Teabag's kit, I think it's 33uF.
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