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Old 10th October 2010, 07:47 AM   #21
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Default Thanks !

Maths and I are not lovers thats for sure ! I spent my teenage years on your side of the Atlantic where the pot was plentiful and cheep...and the girls loved my accent..... Boy, I regret it now .

I found a parts list here on the site with the Digikey stock number on it . Digikey use the same stock number here in their UK .....

I'm hoping my heat sinks are big enough to expand some day, especially as the top and bottom plate will be made from (anodised) 3mm St Steel . and the rear panel 2mm copper . I have those heat sinks from my little hick up . I could use one for the front plate . its looking kind of cool also .

I have also found a recipe for a thermal epoxy home brew . I have all kinds of metallic powders I can use , but bronze seems to be the best option , So 1:1 ratio ( mix ) join the side sinks to the front one and I'll be able to store ice cream in it .

Rich
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Old 14th October 2010, 06:46 PM   #22
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Gents,


I got my Digikey order this morning and thought it would be a good idea to read what each item does within the circuit as I populate the boards.

TIA
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Old 14th October 2010, 08:49 PM   #23
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are there any notes on the above topic that could help ?
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Old 14th October 2010, 09:18 PM   #24
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Quote:
Originally Posted by richluvsound View Post
Maths and I are not lovers thats for sure ! I spent my teenage years on your side of the Atlantic where the pot was plentiful and cheep...and the girls loved my accent..... Boy, I regret it now .

I found a parts list here on the site with the Digikey stock number on it . Digikey use the same stock number here in their UK .....

I'm hoping my heat sinks are big enough to expand some day, especially as the top and bottom plate will be made from (anodised) 3mm St Steel . and the rear panel 2mm copper . I have those heat sinks from my little hick up . I could use one for the front plate . its looking kind of cool also .

I have also found a recipe for a thermal epoxy home brew . I have all kinds of metallic powders I can use , but bronze seems to be the best option , So 1:1 ratio ( mix ) join the side sinks to the front one and I'll be able to store ice cream in it .

Rich
I've never heard of this method, however one purpose of the pad is to electrically insulate the back of the mosfet from the heatsink. If your metal epoxy is conductive, I dont think it will work. Why not mica and thermal grease, or silpads?

Russellc
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Old 14th October 2010, 09:19 PM   #25
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Originally Posted by richluvsound View Post
are there any notes on the above topic that could help ?
Yes, the F-5 manuals over on the Firstwatt site.

Russellc
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Old 14th October 2010, 09:39 PM   #26
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Thank you Russell ,

I have the grease . I used the epoxy to join the heatsinks together ...

The zxt 450 I ordered have different lead dimensions than my PCB ... are they useless ?

I was full of confidence. This is going to be a lot more difficult than I thought ...

Rich
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Old 14th October 2010, 11:11 PM   #27
AndrewT is offline AndrewT  Scotland
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Hi,
slide a tube insulator over the middle leg of the ZTX.
Look carefully at the ZTX datasheet and determine which leg goes into which hole of the PCB.
Form the legs into the arrangement needed and drop it in. Check you have no shorts even if the transistor body gets abused/moved at some time in the future.

Solder it in place.
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regards Andrew T.
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Old 15th October 2010, 02:05 AM   #28
heinz1 is offline heinz1  Europe
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Originally Posted by richluvsound View Post
are there any notes on the above topic that could help ?
Hi Rich,

from your first post I assume that you are building an Aleph 30. I don't know whether a construction guide for this amp is available. But anyway, I have some hopefully useful links for you:

For help in the correct identification of the ZTX legs (also in comparison to equivalent parts) and general assembly hints see cviller's F5 guide:

http://viller.eu/audio/2009jan_gbf5/gbf5_guide.pdf

You might also have a look at this F1 assembly guide for getting an overview on how to organize the building process:

F1 DIY Amp

Hope this helps

Last edited by heinz1; 15th October 2010 at 02:21 AM.
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Old 15th October 2010, 02:38 AM   #29
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Originally Posted by richluvsound View Post
Thank you Russell ,

I have the grease . I used the epoxy to join the heatsinks together ...

The zxt 450 I ordered have different lead dimensions than my PCB ... are they useless ?

I was full of confidence. This is going to be a lot more difficult than I thought ...

Rich
Dont lose confidence now, it really is a fairly straight forward build. Look at my posts when I was building it, If I made it through you will too! It was my first real SS build. What kind of fets do you have? Any pics? I'll be glad to post pics of what I've got. Keep on building!

Here's a pic of some fets I got from member Blues, another shot of them beside the tiny Paul Daniels boards for the F-5, and finally a closeup of the pad on the Daniels board. Hope this helps.
Attached Images
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File Type: jpg IMG_3026.jpg (41.5 KB, 288 views)
File Type: jpg IMG_3027.jpg (66.7 KB, 287 views)
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Old 15th October 2010, 11:43 AM   #30
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Whoops, that's for the F-5. I'm also building an Aleph mini. If it really trips my trigger, I've got the boards for the 30 or 60. doesnt appear any worse than the F-5, plenty of support here.

Russellc
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