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Chip Amps Amplifiers based on integrated circuits

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Old 4th February 2006, 12:59 AM   #1
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Default LM3875-semi finished

This was finished about 2 months ago. Had it running ever since with no problems. A lot better sound than my first one, which was just the standard power boards from Brian. This one has a bigger Tran- 225, and filter caps with a couple of bleeder resistors. I also replaced the rectifiers for some beefier bridges and also added snubbers (22nf 1000v poly's). And I know there's been a lot of talk about those. Do they make it sound better? who know as i've made a number of changes from the first one. But they are in now and thats where they are staying.
The front panel has come off on the power supply box, as i'm thinking about changhing it, didn't like the first one. I only wish i had a bench saw and a really good quality drill press to make the work accurate.......... I'm working on the mrs as this is written, for my allowance to be increased .

Cheers
Brett
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Old 4th February 2006, 01:01 AM   #2
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Default Some pics

This is the front. Made the knob from two bits of purspex and glued them together. Then sanded the whole lot with wet and dry
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Old 4th February 2006, 01:02 AM   #3
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Default Powers supply

Just a shot of the back
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Old 4th February 2006, 01:04 AM   #4
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Default Rear view

The cable was made from plastic tube and the connectors were heated so that the cable could be pushed into them with a good tight fit
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Old 4th February 2006, 01:06 AM   #5
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Default The main amp

I thought that the heat sinks might get a bit hot for this kind of set-up. But seems to be o.k at the moment
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Old 4th February 2006, 01:09 AM   #6
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Default Rear of the power supply

I screwed the wires from the fectifier onto a plate so that if the cable was ever pulled, it would effect the enternal wiring.
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Old 4th February 2006, 01:13 AM   #7
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looks nice. I really like the front knob!
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Old 4th February 2006, 01:23 AM   #8
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Deam, that looks good.
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Old 4th February 2006, 01:55 AM   #9
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It looks very nice!

How does heat get out of the box?

I_F
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Old 4th February 2006, 02:00 AM   #10
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Default Cheers

Thanks carlos,
I had to build this from stuff i had. I really like alluminium, but it's just sooooo expensive here. Thats why i went out and bought a 2.5 metre length just to make this. It was cheaper than buying a special heat sink in the shops.
God knows what I'm going to do with all the rest of it......

Brett
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