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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)

dewdrop 9th January 2019 11:57 PM

Quote:

Originally Posted by Salas (https://www.diyaudio.com/forums/power-supplies/322411-salas-sslv1-3-ultrabib-shunt-regulator-post5659126.html#post5659126)
The orange ones (WP2773ND) look like having close Vf to the reds, also a steeper curve which is a good thing. Orange glow is nice to the eye as well.

Will this work for 5V shunt too Salas?

Tea-Bag 10th January 2019 01:16 AM

Okay,
Here are some measurements for both mouser and element14 parts.
These are taken at 9.1V with a 1K resistor in series. 9V used for battery and 1k common part. Measured for 1 second at below room temperature.
Via Mouser
WP2773ND (orange)
1.88v average
WP2773ID (legacy Red)
1.85v average
WP-144SRDT
1.73v average
WP-113SRDT
1.73v average

Element14
L-383SRDT
1.74v average
L-144IDT
1.85v average
Vishay RHR4400
1.88v average

I am thinking if hovering low voltage for UBIB, we want to be on the lower side, than the SRDT models from kingbright are the way to go here. you may have better luck with element14 where you are for shipping, but who knows. Mouser seems to carry more parts, at least in North America.

Salas 10th January 2019 01:28 AM

You measured for about 7mA change your 1K to 3.3K so to measure at near 2mA which is the average current that the LEDS run in the UBiB

Tea-Bag 10th January 2019 02:00 AM

Quote:

Originally Posted by Tea-Bag (https://www.diyaudio.com/forums/power-supplies/322411-salas-sslv1-3-ultrabib-shunt-regulator-post5659625.html#post5659625)
Okay,
Here are some measurements for both mouser and element14 parts.
These are taken at 9.1V with a 1K resistor in series. 9V used for battery and 1k common part. Measured for 1 second at below room temperature.
Via Mouser
WP2773ND (orange)
1.88v average
WP2773ID (legacy Red)
1.85v average
WP-144SRDT
1.73v average
WP-113SRDT
1.73v average

Element14
L-383SRDT
1.74v average
L-144IDT
1.85v average
Vishay RHR4400
1.88v average

I am thinking if hovering low voltage for UBIB, we want to be on the lower side, than the SRDT models from kingbright are the way to go here. you may have better luck with element14 where you are for shipping, but who knows. Mouser seems to carry more parts, at least in North America.

Quote:

Originally Posted by Salas (https://www.diyaudio.com/forums/power-supplies/322411-salas-sslv1-3-ultrabib-shunt-regulator-post5659633.html#post5659633)
You measured for about 7mA change your 1K to 3.3K so to measure at near 2mA which is the average current that the LEDS run in the UBiB

So this trends us down expectedly on voltage


Via Mouser
WP2773ND (orange)
1.77v average
WP2773ID (legacy Red)
1.73v average
WP-144SRDT
1.67v average
WP-113SRDT
1.675v average

Element14
L-383SRDT
1.67v average
L-144IDT
1.725 average
Vishay RHR4400
1.73v average

Just want to make sure these are all good recommended alternatives for LEDs for 5V

Salas 10th January 2019 02:33 AM

All those you listed between 1.725V and 1.77V at 2mA are good replacements

Salas 10th January 2019 02:43 AM

Quote:

Originally Posted by dewdrop (https://www.diyaudio.com/forums/power-supplies/322411-salas-sslv1-3-ultrabib-shunt-regulator-post5659578.html#post5659578)
Will this work for 5V shunt too Salas?

Yep

Tea-Bag 10th January 2019 02:52 AM

Quote:

Originally Posted by Salas (https://www.diyaudio.com/forums/power-supplies/322411-salas-sslv1-3-ultrabib-shunt-regulator-post5659674.html#post5659674)
All those you listed between 1.725V and 1.77V at 2mA are good replacements

SRDT are a too low and not good? These are the ones kingbright lists as 1.85vF vs 2v.

dewdrop 10th January 2019 04:05 AM

Quote:

Originally Posted by Tea-Bag (https://www.diyaudio.com/forums/power-supplies/322411-salas-sslv1-3-ultrabib-shunt-regulator-post5659649.html#post5659649)
So this trends us down expectedly on voltage





Via Mouser

WP2773ND (orange)

1.77v average

WP2773ID (legacy Red)

1.73v average

WP-144SRDT

1.67v average

WP-113SRDT

1.675v average



Element14

L-383SRDT

1.67v average

L-144IDT

1.725 average

Vishay RHR4400

1.73v average



Just want to make sure these are all good recommended alternatives for LEDs for 5V

Thanks Tea and Salas. This is definitely useful for anyone looking for the alternatives. Looks like the Vishay RHR4400 is the way to go as although the orange WP2773ND at the borderline is tempting for its color. ;-)

Salas 10th January 2019 09:21 AM

Quote:

Originally Posted by Tea-Bag (https://www.diyaudio.com/forums/power-supplies/322411-salas-sslv1-3-ultrabib-shunt-regulator-post5659688.html#post5659688)
SRDT are a too low and not good? These are the ones kingbright lists as 1.85vF vs 2v.

That is at 20mA. They will basically work for us at 2mA also but they have somewhat shallower IF/VF curve at low mA than our legacy red (someone's bought Mouser's full WP2773ID stock during Christmas). Closer to it is the orange version. We wouldn't care much for such details for the whole voltage output range but at circa 5Vout its the two LEDS and the two transistors (Q2,Q3 Vbe) which are the main Vref contributors. An interesting type is the Vishay TLDR4400 deep red round one (Mouser) which has low Vf again but very steep curve at low mA in its datasheet. I hope its chemistry isn't more noisy than other reds for some reason.

dewdrop 10th January 2019 02:23 PM

Ok then, I will go for the orange alternative.


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