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Old 25th April 2005, 06:09 PM   #521
Eric is offline Eric  United States
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Hi Everyone,

Sorry for the threadfart, but I wanted to see if anyone is interested in some heatsinks to go with all of those Aleph 30 component kits (or any other projects...)

Given sufficient interest, I will arrange a group buy for large heatsinks (0.18c/w each) for folks in North America. The thread is here.

Now back to your regularly scheduled programming...
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Old 25th April 2005, 06:43 PM   #522
pplu is offline pplu  Spain
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Default WOW

Got my boards today! Very nice Brian.

Thanks

Regards from Spain.
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Old 26th April 2005, 01:14 AM   #523
BrianGT is offline BrianGT  United States
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Here is my first idea for a chassis for a low power amp with these small boards
http://www.briangt.com/gallery/aleph-briangt-mini

I like how the red of the table reflects on the front of the amp:
Click the image to open in full size.

I will push the power as far as these heatsinks will allow, which I still expect to be < 10w, but good for a simple amp.

As for the power supply board used, I cropped down the power supply board to use 4 caps and to fit in the chassis, leaving room for the wiring up the connectors on the back. I will make a mounting bracket to sit it over the transformer, which will fit rather well with the low profile caps and heatsinks.

I will try to work on this soon, as I have shipped out all of the current pcb orders, except for 2 (one recent arrival, and one waiting for the new chipamp boards to arrive). I still have a 3" high stack of power supply boards and a 5" stack of amp pcbs, if anyone wants to get them.

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Brian
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Old 26th April 2005, 01:31 AM   #524
jleaman is offline jleaman  Belgium
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Doesn't this have to be wired up and have parts on the board for it to work : O )
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Old 26th April 2005, 02:33 AM   #525
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This is probably not the best place to ask, but where can i read about the first Mini-A with SMD?

Using the search resulted in me

Iīm trying to make my own A60 layout and thinking about using SMD. Would like to know the pros/cons of Brians SMD Mini-A and for instance if there was any problems using 0,5W resistors.
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Old 26th April 2005, 12:55 PM   #526
dhole is offline dhole  United Kingdom
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Thanks Brian!

Got the board today.

So I'm thinking of making an aleph 60 on the boards I have a few questions:

The Mark Finnis aleph 5 used 6 output mosfets per channel. Could I use 6 for the aleph 60 ? They seem to have most of the same specifications.

Apart from the obvious changes . I am thinking the ratings of the 3w resistors in the aleph 30 should be upped to 9-10w for the aleph 60.

any other differences I should look out for please dont hesitate to mention.
regards
dave
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Old 26th April 2005, 01:04 PM   #527
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by dhole
Thanks Brian!

Got the board today.

So I'm thinking of making an aleph 60 on the boards I have a few questions:

The Mark Finnis aleph 5 used 6 output mosfets per channel. Could I use 6 for the aleph 60 ? They seem to have most of the same specifications.

Apart from the obvious changes . I am thinking the ratings of the 3w resistors in the aleph 30 should be upped to 9-10w for the aleph 60.

any other differences I should look out for please dont hesitate to mention.
regards
dave
If I understand correctly, the sum of the currents through the output devices is greater for the Aleph60, but the current per device is the same, which should allow for 3W resistors to still be used. Correct me if I am wrong. The Aleph60 manual indicates 3W resistors. There is also room on the output resistor section to wire 6 resistors in parallel through stacking. (7 = max possible)

The output boards will allow you to cascade them and use multiple boards per channel. I am going to make an Aleph 5 with the boards, once I finish initial mini Aleph amp. Here are my chassis size estimates:
http://www.briangt.com/gallery/aleph...-mini/chassis5
silver one = stereo Aleph 60 or Aleph 5
bigger one with black heatsinks = Aleph 30 (might be able to up the bias here, since the same 4 heatsinks were also used for an Aleph 2 monoblock: http://www.passdiy.com/gallery/aleph2-p1.htm )
small one = mini Aleph

Attached a picture of the output resistor configuration for the Aleph 60. (more output boards needed, boards attached in possible Aleph30 configuration. For my Aleph 30 amp, I will put 1 output board on each of the 4 heatsinks [attached from the board], allowing for more heat dissipation)

--
Brian
Attached Images
File Type: jpg out-resistors.jpg (97.5 KB, 907 views)
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Old 26th April 2005, 01:13 PM   #528
Ruben is offline Ruben  Switzerland
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Default The boards have arrived in Switzerland

Thanks a lot Brian!

The boards have arrived up there in our swiis mountains, and thex look great!
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Old 26th April 2005, 01:16 PM   #529
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Brian,

I know ive asked this before, but never got a definitive answer and im still trying to get a hold of all this stuff.

Im planning A5 for a friend of mine, other than obvious component changes, source resistors etc, am i just raising rail votages and changing bias?

regards
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Old 26th April 2005, 01:19 PM   #530
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by MEGA-amp
Brian,

I know ive asked this before, but never got a definitive answer and im still trying to get a hold of all this stuff.

Im planning A5 for a friend of mine, other than obvious component changes, source resistors etc, am i just raising rail votages and changing bias?

regards
Exactly. If you combine the Aleph60 and Aleph 5 service manual schematics, you will get what you need. Most of the components will match the Aleph 60 values, except for the number of output devices, and the value of the bias resistors.

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