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High current dual rail regulator kit for power amplifier
High current dual rail regulator kit for power amplifier
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Old 29th October 2017, 09:13 AM   #1
dotneck335 is offline dotneck335  United States
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Default High current dual rail regulator kit for power amplifier

I am looking at this for a power amplifier power supply:
High current dual rail regulator kit for power amplifier or bench power supply ! | eBay
The only thing it seems to be lacking is some feedback to reduce noise.
Anybody got something better?
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Old 29th October 2017, 09:27 AM   #2
scottjoplin is offline scottjoplin  Wales
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R13 and R14 provide feedback
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Old 29th October 2017, 11:22 AM   #3
dotneck335 is offline dotneck335  United States
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Quote:
Originally Posted by scottjoplin View Post
R13 and R14 provide feedback
Yeah, I guess they do. I was thinking more of an opamp-type feedback, with gain, like this one: LM317 / LM337 +/-1.5V~37V Adjustable Dual Voltage Regulator Power Board | eBay
But with the pass transistors to handle more current.
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Old 29th October 2017, 11:40 AM   #4
AndrewT is offline AndrewT  Scotland
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the 3pin regulators are opamps tailored to give an output that is defined by the feedback arrangement.
Have a look at the datasheet simplified schematic to see just how complicated it must be.

It's that complication that increases the risk of instability and why the Builder MUST follow the esr recommendations in the datasheets.
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Old 9th November 2017, 02:24 PM   #5
dotneck335 is offline dotneck335  United States
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Originally Posted by AndrewT View Post
..........the Builder MUST follow the esr recommendations in the datasheets.
Hmmmm....I am looking at the T.I. LM317 datasheet, and I do NOT see any ESR recommendations per se. The applications schematics show a 1uF cap on the output for low-current, and a 47uF cap for the high-current use. Did I miss something?
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Old 9th November 2017, 02:27 PM   #6
asuslover is online now asuslover  Romania
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I would not get the kit, just buy the boards only.
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Old 9th November 2017, 02:59 PM   #7
dotneck335 is offline dotneck335  United States
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Quote:
Originally Posted by asuslover View Post
I would not get the kit, just buy the boards only.
Why is that?
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Old 9th November 2017, 04:11 PM   #8
asuslover is online now asuslover  Romania
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Why ? When YOU buy the kit YOU get some questionable quality caps, few resistors and a few possible fake semiconductors. The price you see there when you click on the link is not a full kit, so you need to buy other components anyway...
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Old 9th November 2017, 07:21 PM   #9
Chris888 is offline Chris888  United Kingdom
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Buying a kit or PCB can save a lot of time. Particularly if you are more interested in the audio amp than the PSU.
Whether it's a 'good' psu might depend what you want.
The ideal PSU might be designed with output protection in mind?
It comes down to what you want from 'DIYing your Audio.

Circuit-wise it looks sound enough. A good, conventional approach?
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Old 9th November 2017, 09:37 PM   #10
dotneck335 is offline dotneck335  United States
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Quote:
Originally Posted by asuslover View Post
Why ? When YOU buy the kit YOU get some questionable quality caps, few resistors and a few possible fake semiconductors. The price you see there when you click on the link is not a full kit, so you need to buy other components anyway...
Yeah, but the board by itself is only $13 less than the kit with parts (filter caps and pass transistors not included)
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