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Old 23rd November 2013, 10:20 PM   #191
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OK, I see what you are saying. I guess that was my point. I did play the amp really loud for and extended period of time to make sure the bars(heatsinks) would be sufficient. The heatsinks on the SKA were plenty hot but the heatsinks on the PSU were barely warm. I was just wondering because I saw some pictures of some pretty big heatsinks on these PSU's and wondered if any of them got hot and if so, what amp were they driving. Mine doesn't even breaks a sweat.

Thanks, Terry
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Old 24th November 2013, 08:24 AM   #192
AndrewT is offline AndrewT  Scotland
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That low heat dissipation implies low Vdrop through the regulators when delivering 250mA of Iq.
Normal music playing does not increase the average current draw that much.

But the low Vdrop could be a problem.

What is the regulator Vdrop when mains is at maximum tolerance?
What is the regulator Vdrop when mains is at minimum tolerance?

If the Vdrop is high the regulator will run hotter.
If the Vdrop is low then the regulator will drop out. That is what you must check.
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Old 24th November 2013, 10:09 PM   #193
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Quote:
Originally Posted by AndrewT View Post
That low heat dissipation implies low Vdrop through the regulators when delivering 250mA of Iq.
Normal music playing does not increase the average current draw that much.

But the low Vdrop could be a problem.

What is the regulator Vdrop when mains is at maximum tolerance?
What is the regulator Vdrop when mains is at minimum tolerance?

If the Vdrop is high the regulator will run hotter.
If the Vdrop is low then the regulator will drop out. That is what you must check.
Hi Andrew,

Not sure what you are referring to with Vdrop. It is a 40-0-40vAC transformer. With just normal bridge and filter it produces around +/-58vDC. I have the DX supply adjusted down to +/-50vDC for the SKA. It holds right there seemingly regardless of what level the amp is playing at. Almost not voltage change at all.

Thanks, Terry
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Old 25th November 2013, 08:36 AM   #194
AndrewT is offline AndrewT  Scotland
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58V supply and 50Vdc output tells you that the Vdrop across the regulator is 8Volts.
That voltage varies. It varies a lot.
As your current draw changes the Vdrop changes.
As your mains supply voltage changes the Vdrop changes.
You need to know that the regulator never falls out of regulation.
You do this either by modeling or by measurement.
Find out how low the Vdrop becomes in worst case operation.
Find out how high the Vdrop becomes for worst case regulator heat creation.
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Old 26th November 2013, 01:50 PM   #195
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Default Maximum current info is needed to see if the Dx Supply

Will be good to do this job....it was made to 4 to 5 volts of voltage drop (voltage in the colector minus voltage in the emitter....or input voltage minus output voltage)... was made to the Dx Amplifier,

Of course other amplifier can use it, but we must check if the supply can face the power or not..and this depends on the current and voltage drop.

This voltage drop is multiplied by the maximum current..then we gonna have the power ...and this must be checked to know if the supply will hold the job without fail...transistors have maximum current, maximum voltage and as a result maximum power, and this must be checked.

Power into the series pass transistors, to each rail, is the rail current multiplied by that particular rail voltage drop.

You said 58 will go in and 50 will be the the adjusted voltage...so...we have 8 to multiply by the maximum current the SKA will drain from the suipply (full power at 2 ohms current)..... then we gonna see if your transistors (type and quantity) will be enough.

In the reality, dear Terry, this calculation is for "worst case scenario", because real world the input voltage (58 volts) will drop depending the current drained)...so...we have a safe margin after the calculation based in 58 volts.

regards,

Carlos
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Last edited by destroyer X; 26th November 2013 at 01:59 PM.
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Old 27th November 2013, 05:39 PM   #196
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I played it for two days straight and nothing got even warm in the PSU. I have increased the voltage to +/-52V because that is what Greg Ball suggested. I don't hear any difference. I'm not going to take a chance and play the amp into 2ohm at full volume. It handles 4ohm just fine.
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Old 9th April 2014, 05:07 AM   #197
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Default Final layout For Dx supply

Hi All

can any one have have Final PCB layout for DX supply on Greg's site
please shear
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Old 21st April 2014, 10:01 AM   #198
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Not completed yet but here a preview of an other approach of the PSU and an audio friend is helping.It is based on a Thel Audio design
Attached Images
File Type: png DX PSU.png (59.8 KB, 150 views)

Last edited by meanman1964; 21st April 2014 at 10:03 AM.
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Old 21st April 2014, 10:16 AM   #199
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Quote:
Originally Posted by meanman1964 View Post
Not completed yet but here a preview of an other approach of the PSU and an audio friend is helping.It is based on a Thel Audio design

Hi meanman1964

I Want Simple Dx supply layout for one Channel for Dx standard or Dx Blame ST not regulated with dual Channel.You have that one
Thanks for your help
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Old 21st April 2014, 01:33 PM   #200
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Quote:
Originally Posted by sanbadgujar View Post
Hi meanman1964

I Want Simple Dx supply layout for one Channel for Dx standard or Dx Blame ST not regulated with dual Channel.You have that one
Thanks for your help
Sorry I don't try Vargasmongo
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