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29th May 2004, 05:45 PM
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#1 |
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diyAudio Moderator Emeritus
Join Date: May 2003
Location: UK
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Material for amp case
Can I build a chip amp case using plastic, or must it be metal for shielding?
__________________
"The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.) |
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29th May 2004, 05:52 PM
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#2 |
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diyAudio Member
Join Date: Sep 2003
Location: Midland, Michigan
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You can use a plastic case for your amplifier but you'll need to provide metal heatsinking for the IC's.
Actually, metal is better for the case. It also looks much better.
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Frank |
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29th May 2004, 06:17 PM
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#3 |
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diyAudio Moderator Emeritus
Join Date: May 2003
Location: UK
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Well I don't have the tools to do good metal work yet, but I have a picture in mind for an open/exposed design using transparent plastic for the top and bottom in a kind of curvy x shape. Similar to that record player, you know the one...
I'm not experienced enough to know if I'm making a bad compromise going away from metal though. Naturally there will be big chunks of metal for the heatsink 
__________________
"The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.) |
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29th May 2004, 06:25 PM
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#4 |
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diyAudio Member
Join Date: Sep 2003
Location: Midland, Michigan
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Just make sure that you have provided enough airflow around the heatsinks.
it would be a shame to see your work of art melt because the metal heatsinks were sealed in a plastic enclosure with no ventilation. Show us photos as your work progresses!
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Frank |
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29th May 2004, 06:58 PM
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#5 |
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diyAudio Member
Join Date: Sep 2001
Location: Pickering, Canada
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Same here metal casing is very expensive for me and not enough experience with metal so I choose to be cheap and use MDF, plexiglass is not cheap and wrap over time.
paint any texture you like GC number two in the making... Chris |
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29th May 2004, 07:28 PM
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#6 |
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diyAudio Member
Join Date: Feb 2003
Location: Somerset, SW England
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My first GC's were built in plastic tubes (100 mm soil pipe) although I lined the inside with kitchen foil for shielding.
 Wheher you need shielding or not depends on what interference you are susceptible to. I have had one of my amps running here for about four months on a plank of wood with no shielding and with no problem.
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The truth need not be veiled, for it veils itself from the eyes of the ignorant. |
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29th May 2004, 07:37 PM
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#7 |
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diyAudio Member
Join Date: Jul 2002
Location: Toronto, Canada
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I like this case approch: Sun Microsystems Gainclone?
__________________
www.audiosector.com “Do something really well. See how much time it takes. It might be a product, a work of art, who knows? Then give it away cheaply, just because you feel that it should not cost so much, even if it took a lot of time and expensive materials to make it.” - JC |
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29th May 2004, 07:57 PM
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#8 |
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diyAudio Moderator Emeritus
Join Date: May 2003
Location: UK
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Great news. This opens some more practical options to me. Well here's a preliminary idea...
__________________
"The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.) |
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29th May 2004, 08:22 PM
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#9 |
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diyAudio Member
Join Date: May 2003
Location: San Diego, USA
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Plastic is OK
Plastic is ok, but if you want to use a metal one, You could get some nonworking stereo components and "gut" the innards from them, and use the case. I did this with an old Kyocera CD Player/ Gainclone (posted on diyaudio here )
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29th May 2004, 08:39 PM
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#10 |
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diyAudio Moderator Emeritus
Join Date: May 2003
Location: UK
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I'm quite getting into this...
__________________
"The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.) |
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