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Old 29th May 2007, 06:30 PM   #1
Ryssen is offline Ryssen  Sweden
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Default One or 2 PSU´s for Mini-A?

Are there any bennefits of using one PSU/channel,instead of one for both?
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Old 29th May 2007, 06:36 PM   #2
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Assuming that you're talking about building a stock Mini-A, the power supply requirements are pretty modest--something around +-15V and 1A per channel. It's not that hard to pull together a power supply that will do two channels. However, if you want to do monoblock I'm all in favor of the idea.

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Old 29th May 2007, 06:48 PM   #3
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Quote:
It's not that hard to pull together a power supply that will do two channels.
No,but if they are in the same box,would I get better values on for example S/N or crosstalk with one for each channel?
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Old 29th May 2007, 06:55 PM   #4
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Depends on how well you build the power supply...
It's not that hard to isolate the channels from one another passively. For that matter, given that the current requirements are modest, you could easily do a capacitance multiplier or go fully regulated.

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Old 29th May 2007, 07:05 PM   #5
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The reason I asked is because I allready have a 2x12v AC 300VA trafo,and 2 original Mini-A PSU cards.My dillema is use this trafo or sell iy and buy 2 150VA. Or will it work 1 trafo,one PSU board/Channel?
I will go:C-L-C.
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Old 29th May 2007, 08:32 PM   #6
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Yeah, it's cool. One of many options would be:
Transformer->bridge->cap->resistors (split with smallish resistors from this cap--one for each channel)-caps (one bank for each channel
Or you could use inductors. Or you could use a combination of various things.
But, yes, a 300VA transformer will be marvelous for two channels of Mini-A.

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Old 29th May 2007, 10:53 PM   #7
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Ok,then I choose the inductors with my 300VA.
Thanks!
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Old 19th June 2007, 12:50 AM   #8
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I built a pair of Mini As both ways. Funny thing is the design is so solid changing caps power supplies and other external things made a minimal change in sound . Driving the mosfets harder with more bias seemed to be the only thing that made any significant change. It falls back to provide more than adequate heat-sinking and enough voltage swing and let the fun begin.

Bill
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Old 20th June 2007, 08:27 AM   #9
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I run mine with 2x12v AC 300VA C-R-C.
One of the best amps I've ever heard now for the F4.
Cheers Bruce
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Old 9th September 2007, 01:07 AM   #10
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Been thinking about going regulated anyway..but,will a capacistans multiplier do a bout the same thing?
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