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Old 30th January 2001, 10:02 PM   #1
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Hi there !
Everybody should check the new Aleph 4 project thatīs posted in the Passlabs site.
It looks cool and a very good job.
Soon pcbīs.
A lot of thanks to Mark Finnis who posted his amp.
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Old 31st January 2001, 04:02 PM   #2
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gee you were quick!

100 Watts @ 8 Ohms of single ended pure class A! This beast was worth a fortune. On the site the builder says he will forward the .pdf files of the PCB to "desmond". Is this a kit re-seller?

Thanks for the heads-up. BTW the site is here: http://www.passlabs.com/gallery/a4-p1.htm
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Old 31st January 2001, 04:30 PM   #3
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I think Desmond is someone at Pass Labs. He was refering to the PDF that is already on the site. It must have need to be post after the initial info was sent to Pass Labs.
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Old 5th February 2001, 02:22 AM   #4
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Default Aleph4 Info

Hi Folks,

FYI. Desmond Harrington is the webmaster and PR person for PassLabs. If you want any info from PL he should be your first port of call rather than NP himself.

Being the said builder of the Aleph4 a little info. I am not a reseller. Anyone is welcome to any info re the amp.

You can get a PDF from the projects gallery which has the necessary info:

http://www.passlabs.com/images/gallery/a4-p1-pcbs.pdf

You can use IFRP244, IFRP240, IRF244 ..... NP states it doesn't matter. IFRP240s are what he would (and does) use now.

NOTE: there was an ERROR in the first PDF which omitted a join from C9-R26 to the base of Q3. I have sent Des a replacement file which should be on the site as we speak.
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Old 5th February 2001, 08:21 AM   #5
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The Irfp 240 I think are the easiest to find.
The only problem is they need matching which is easy to do with 1 resistor and a good digital multimeter.
The only problem is that they cost more the input ones.
Itīs just something you have to do if you want your amp to be perfect. Thatīs the whole idea anyway.
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Old 7th February 2001, 09:38 PM   #6
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Thumbs up thanks a bunch

Really thanks to Mark Finnis and excellent job on the Aleph 4. I am about half way though my A40 and want to put it on the back burner and start an Aleph.
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Old 7th February 2001, 10:46 PM   #7
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Yeah it looks great !
I am still trying decide what to do ?
The thing that troubles me the most is the box.
But its a big help to have ready pcbs.
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Old 16th December 2007, 09:06 PM   #8
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100 W class A Yees please!

I was triing to get the schematics.

But could not folow the tread.

Could you post them please.

PS I have started to work on the heat sinks

Plan is to use 2mm copper sheet and 4 mm thick buss bar + fans
for which is quite easy to make a speed controler (speed increse with temperature )

So far cost is around Ģ30 for the copper (I have same good sources)

Copper is a beter conductor than alluminium it does oxidise with time but it can be Gold Silver or Crome plated again I shuld be able to get this cheap.

I will let you know but I am stuck witout the schematics.
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Old 16th December 2007, 09:17 PM   #9
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This is an OLLD thread ...

Easiest to get at from my own page:

http://www.users.on.net/~mefinnis/passlabs/aleph4.htm

Cheers

Mark
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Old 17th December 2007, 08:33 AM   #10
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The links to the PassLabs site doesn't work on my PC.
How can I see the pictures?
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