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Old 15th April 2012, 01:33 PM   #1041
TheShaman is offline TheShaman  Europe
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I agree.
It'd be a good idea to have provisions on the PCB for installing resistors in parallel.
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Old 17th April 2012, 12:41 PM   #1042
Siberia is offline Siberia  Lithuania
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I want to use SSLV 1.1 for feeding 28VDC to my future Pearl II RIAA. Getting a 2x24 R-Core, I would get around 26VAC on my Tx secondaries because of local mains, and 26 X 1.33 = 34,5VDC after rectification. Is it enough for an extra voltage? Or are two 2x15 R-Cores recommended for bigger DCin?
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Old 17th April 2012, 12:46 PM   #1043
AndrewT is offline AndrewT  Scotland
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No.

How many times does it need to be repeated that the Salas Style Regulator needs >=7V across the CCS?
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Old 17th April 2012, 01:05 PM   #1044
Siberia is offline Siberia  Lithuania
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I'm aware what's written in the guide. It says, at least extra 5V, but 7-10V recommended. The reason I'm asking this because i get <7V across, but with two 2x15 I would get into 45VDCin, which may be too much for cooling it down. All I wat to know which way is prefered.
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Old 17th April 2012, 02:36 PM   #1045
Salas is online now Salas  Greece
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SSLV1.1 builds &amp; fairy tales
Burn as much as you want on a CRC pre filter so you have control and extra filtering? Longer pants have always the better chance to get cut to measure.
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Old 17th April 2012, 02:42 PM   #1046
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by Siberia View Post
7-10V recommended. The reason I'm asking this because i get <7V across,.........
Have you checked what DC voltage with ripple voltage superimposed that will appear at the regulator power input when the mains voltage swings over the range from maximum supply to minimum supply?

It is the voltage amplitude at the minima due to the ripple that determines the worst case Vin at the regulator.
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Old 17th April 2012, 03:41 PM   #1047
Siberia is offline Siberia  Lithuania
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Quote:
Originally Posted by AndrewT View Post
Have you checked what DC voltage with ripple voltage .
No.

I admit that I don't know the maths behind it, but would love to know how you do it.

Explaining that it's

Quote:
Originally Posted by AndrewT View Post
voltage amplitude at the minima due to the ripple that determines the worst case Vin at the regulator
is not enough for my knowledge level. Sorry.

Then I just realised that I would better use Pear II, omitting onboard regulator and feeding it with 24VDC of SSLV 1.1 Tx 2x24VAC is about right then for the purpose.
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Old 17th April 2012, 03:47 PM   #1048
Tea-Bag is offline Tea-Bag  United States
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SSLV1.1 builds &amp; fairy tales
Siberia, I am using 2 x 24v transformer with Pearl2 onboard reg removed.
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Old 17th April 2012, 04:08 PM   #1049
Siberia is offline Siberia  Lithuania
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OT. Quick question. I'm planning to remove U1, U2, and to replace them with 10R resistances making an additional CRC filter. I would connect shunt. reg. after this filter. Is that the way yours is made?
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Old 17th April 2012, 07:41 PM   #1050
Siberia is offline Siberia  Lithuania
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And I'm I correct to suppose Tx 30VA is enough for that matter?
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