One or 2 PSU´s for Mini-A?

Ryssen · 29th May 2007, 06:30 PM

Are there any bennefits of using one PSU/channel,instead of one for both?

GRollins · 29th May 2007, 06:36 PM

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.

Grey

Ryssen · 29th May 2007, 06:48 PM

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?

GRollins · 29th May 2007, 06:55 PM

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.

Grey

Ryssen · 29th May 2007, 07:05 PM

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.

GRollins · 29th May 2007, 08:32 PM

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.

Grey

Ryssen · 29th May 2007, 10:53 PM

Ok,then I choose the inductors with my 300VA.
Thanks!

wirewiggler · 19th June 2007, 12:50 AM

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

Assesears · 20th June 2007, 08:27 AM

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

Ryssen · 9th September 2007, 01:07 AM

Been thinking about going regulated anyway..but,will a capacistans multiplier do a bout the same thing?

29th May 2007, 06:30 PM	#1
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	One or 2 PSU´s for Mini-A? Are there any bennefits of using one PSU/channel,instead of one for both? __________________ Regards Åke

29th May 2007, 07:05 PM	#5
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	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. __________________ Regards Åke

29th May 2007, 10:53 PM	#7
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	Ok,then I choose the inductors with my 300VA. Thanks! __________________ Regards Åke

9th September 2007, 01:07 AM	#10
Ryssen diyAudio Member Join Date: Dec 2003 Location: Sweden--> Here	Been thinking about going regulated anyway..but,will a capacistans multiplier do a bout the same thing? __________________ Regards Åke

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

29th May 2007, 06:36 PM	#2
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	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. Grey

29th May 2007, 06:55 PM	#4
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	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. Grey

29th May 2007, 08:32 PM	#6
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	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. Grey

19th June 2007, 12:50 AM	#8
wirewiggler diyAudio Member Join Date: Mar 2005 Location: Bakersfield Ca	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

20th June 2007, 08:27 AM	#9
Assesears diyAudio Member Join Date: Feb 2004 Location: Newcastle	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

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Mini-A PCB'S	sandstorm33	Pass Labs	3	23rd March 2008 11:39 PM
the Very Mini Magico Mini	zei	Multi-Way	7	11th February 2008 08:10 PM
My new mini-A. I really like it!	mpmarino	Pass Labs	20	3rd August 2005 02:37 AM
New Mini	MikeW	Pass Labs	39	7th June 2004 02:10 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read