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Old 11th June 2005, 05:43 PM   #1
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Default jimbo's chipamps

I've got 3 kits on the way (lm3875, lm3886, lm4780) to be used eventually as the amps for 3-way active front speakers (once i've worked out the system configuration).

To start I will build them as straightforward stereo amps, with attenuation, to allow comparison, trial of different attenuators etc.

Here are some pictures of my layout scheme for comment.

I've bought a sheet of 10mm aluminium, and have access to a milling machine and a sheet bending machine and plenty of thin stainless sheet.

3 amps:
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Old 11th June 2005, 05:44 PM   #2
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inside side view
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Old 11th June 2005, 05:46 PM   #3
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Top view, and inside view with lid/base removed
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Old 11th June 2005, 05:54 PM   #4
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The idea is to have separate power and amp compartments.

Lid and base will be removable to allow assembly/modifiaction of the 2 section.

The lid/base will be sheet metal bent into a simple C shape, the chassis will be held together by M4 socket screws in counterbored holes. The dividing middle 'floor' will be fixed from the inside.

The front/rear panel will be milled down where necessary for fixing of sockets.

10mm Al sides for heat sinking, and a width of 140mm were the design drivers.
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Old 11th June 2005, 05:59 PM   #5
steenoe is offline steenoe  Denmark
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Looks promising, indeed. Very nice drawings you made there

Steen
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Old 11th June 2005, 06:22 PM   #6
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Thanks. If I had autocad I'd do some proper drawings, but for now Powerpoint is my design tool
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Old 11th June 2005, 06:57 PM   #7
Nuuk is offline Nuuk  United Kingdom
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Quote:
for 3-way active front speakers (once i've worked out the system configuration).
Jimbo, you may find this gives you some ideas!
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Old 12th June 2005, 01:51 PM   #8
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Nice work Jimbo!

I'm after some sheet aluminium for an 8-channel LM3886 gainclone. Where did you buy yours?
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Old 12th June 2005, 02:16 PM   #9
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http://www.metalfast.co.uk/ would have cost about 60quid for 1200mm x300mm x10 inc vat and 15quid delivery. I got mine via my brothers company for the same price.

Once again I was tempted to buy in bulk 'just in case' because of the delivery charges, so I nearly bought sheets of 8mm and 6mm as well.
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