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Alpha Nirvana 39w 8ohm Class A Amp
Alpha Nirvana 39w 8ohm Class A Amp
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Old 30th May 2020, 06:31 AM   #1301
hpro is offline hpro  Switzerland
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Join Date: Apr 2012
Location: Bern, Switzerland
Quote:
Originally Posted by andyr View Post
Thanks, hpro.

Sorry, hpro - I don't understand what you're getting at, here?

Andy
Too many wires laid out to and from the PCB.. try to use less.
I have in my amps - Rail +- wires, Ground wires, Loudspeaker only the Positive one to the PCB the second on Center/grounding this and then the Fans control ..

Try to design the Power/transistor PCB that there you don't need wires to connect the Pins.
Check out this pics so you will see the difference, and then check out my 2020 with almost only Supply in and out wires.. But that one is not finished yet so it might does not look that good. it will be in the box same as the others, in about 14 days when testing has finished. you will find in my thread about Class A.

Amps are: Class a, Ver.4 - 50Watts per channel build 2013 Single end with Constant Current Transistors Quasi Complimentary *all NPN transistors in Output * - and PID to control DC Out.
4 Fans running at approximately 450RPM / Fan
Class A Ver. 5.02 -50Watts / Channel Build September 2017 Single End with Constant Current Transistor Quasi Complimentary *all NPN transistors in Output * - and PID to control DC output & Fan Control units which will activate Fans, at the Temp of 75C and switch them of at 30C even the Amp has already been switched of beforehand.
Fan speed is 600rpm / 6 Fans and I can assure you, you will not hear the Fans


Anyway I like your build it looks good, and of course that you are using the Active Cooling sinks..
Today it's very uncomplicated to have the Fans run at speeds, so that they keep the heat exactly where the designer wants them without to be annoying loud..
If an Amp get 75C or 80C this doesn't kill the AMP otherwise my AMPS would be dead a long time ago... they run almost daily for 4 and more hours.

Nice build I like it.
Attached Images
File Type: jpg Class A ver.4- 2013.jpg (234.9 KB, 110 views)
File Type: jpg Class A ver.4- 2013_01.jpg (227.7 KB, 104 views)
File Type: jpg Class A ver 5.02 2017.jpg (243.6 KB, 104 views)
File Type: jpg Class A ver 5.02 2017_01.jpg (236.0 KB, 103 views)
File Type: jpg Class A Backs.jpg (216.3 KB, 103 views)
File Type: jpg class A Top Front.jpg (212.7 KB, 50 views)
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Old 30th May 2020, 07:21 AM   #1302
andyr is offline andyr  Australia
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Join Date: Nov 2003
Location: Melbourne (Oz, not Florida!)
Quote:
Originally Posted by hpro View Post
Too many wires laid out to and from the PCB.. try to use less.
My knowledge is limited, hpro - I simply use what the designer specified.

Andy
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Old 30th May 2020, 07:43 AM   #1303
hpro is offline hpro  Switzerland
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Join Date: Apr 2012
Location: Bern, Switzerland
Default Good Work

Quote:
Originally Posted by andyr View Post
My knowledge is limited, hpro - I simply use what the designer specified.

Andy
And for that this is more than very good what you have build..
and my input is just a thought.. so please don't take it serious..
If I look back at my first build 40 years ago, then you did that one like a Masterpiece... I couldn't compare.. and this in every aspect,,

My thoughts were somewhere else, and this has nothing to do with your Build.
In my life I had two big things in my head
Never give up
Keep it simple

But anyway here is the reason for my input about to many wires.. and again this has nothing to do with your build directly, it's just my experiences in a lifetime.

Today it works and it's understandable.. in ten years when it might needs to be serviced, then it will turn out complicated, because the more parts and wires someone runs in an Amplifier or in a CAR or in a Dishwasher or whatever, the more chances are there that it fails..So easy

So take this as a compliment and not as a blaming or likewise..I would never try to offend you or put things you build down in anyway.
Good Work..
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Old 30th May 2020, 08:30 AM   #1304
andyr is offline andyr  Australia
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Join Date: Nov 2003
Location: Melbourne (Oz, not Florida!)
Quote:
Originally Posted by hpro View Post
In my life I had two big things in my head
Never give up
Keep it simple
Admirable aims!

Quote:
Originally Posted by hpro View Post
Today it works and it's understandable.. in ten years when it might needs to be serviced, then it will turn out complicated, because the more parts and wires someone runs in an Amplifier or in a CAR or in a Dishwasher or whatever, the more chances are there that it fails
Agreed.

Quote:
Originally Posted by hpro View Post
So take this as a compliment and not as a blaming or likewise..I would never try to offend you or put things you build down in anyway.
Good Work..
No offence taken, hpro.

Andy
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Old 30th May 2020, 09:11 AM   #1305
jacques antoine is offline jacques antoine  France
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Join Date: Jan 2013
Alpha Nirvana 39w 8ohm Class A Amp
Hi Hpro,

Are those repurposed cheesegrater Mac Pro chassis ?
Nice work btw.
Cheers,

Jacques
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Old 30th May 2020, 03:18 PM   #1306
hpro is offline hpro  Switzerland
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Join Date: Apr 2012
Location: Bern, Switzerland
Default Yes MAC PRO G5

Quote:
Originally Posted by jacques antoine View Post
Hi Hpro,

Are those repurposed cheesegrater Mac Pro chassis ?
Nice work btw.
Cheers,

Jacques
@jagues antoine
Yes that are G5 Mac Pro computer originally.. givin nice Chassis.. I buy them for about 50 - 100 CHF = Same in US$ a piece.

I also use the Heat sinks of them for my new Class A..

It's almost to the point to get it into the case..Again Mac Pro G5 Boxes
Needs a bit modeling and there we go..
Regards Chris
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