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10th September 2006, 03:41 AM
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#1 |
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diyAudio Member
Join Date: Nov 2004
Location: New Zealand
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Completed LM3875
This is from an old Yamaha CD player from a mate which I stripped. Put a new front panel on with some perspex. Then painted and inserted a 20mm LED, Why i call it BT1(bad taste) as everyone was using mini super bright blue LED's i wanted something different.
Tranny is 300VA 25-0-25, with two bridged rectifiers 35amp 400v. Two rails of filter caps: 10,000uf ea. 4.7uf 50v Elna at the front of each rail 100nf 275v at the end of each rail. Sanded some plumbing nuts down with some wet & dry then drilled and counter sunk them for the screws and used them for the feet. 10mv & 5mv DC offset, so pretty happy.
__________________
I realized that a major part of my job was to figure out how to use technology control to create economic force, or leverage, such that money and business flowed in Microsoft's direction” — Alex St.John, father of DirectX. |
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10th September 2006, 03:42 AM
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#2 |
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diyAudio Member
Join Date: Nov 2004
Location: New Zealand
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More Pics
Here is a pic of the power supply
EDIT: The caps are 22nf 1000v poly's
__________________
I realized that a major part of my job was to figure out how to use technology control to create economic force, or leverage, such that money and business flowed in Microsoft's direction” — Alex St.John, father of DirectX. |
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10th September 2006, 03:46 AM
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#3 |
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diyAudio Member
Join Date: Nov 2004
Location: New Zealand
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Filter caps
These were put into a 25mm block od perspex. They go all the way down. There is a white perspex plate at the bottom. the rails were made up from enamelled copper wire which i had to scratch away at the corretc distances(Boring
 )EDIT: The bleeder resistors are 20w 6K8
__________________
I realized that a major part of my job was to figure out how to use technology control to create economic force, or leverage, such that money and business flowed in Microsoft's direction” — Alex St.John, father of DirectX. |
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10th September 2006, 03:48 AM
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#4 |
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diyAudio Member
Join Date: Nov 2004
Location: New Zealand
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Amp
These were the easiest of course I made sure of my earthing. placed a .5ohm resisitor and a 220nf cap in the earth path.
Mybe it's over-kill, but it is quiet.
__________________
I realized that a major part of my job was to figure out how to use technology control to create economic force, or leverage, such that money and business flowed in Microsoft's direction” — Alex St.John, father of DirectX. |
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10th September 2006, 03:52 AM
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#5 |
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diyAudio Member
Join Date: Nov 2004
Location: New Zealand
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feet
A pic of the feet
__________________
I realized that a major part of my job was to figure out how to use technology control to create economic force, or leverage, such that money and business flowed in Microsoft's direction” — Alex St.John, father of DirectX. |
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10th September 2006, 08:26 AM
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#7 |
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diyAudio Member
Join Date: Feb 2003
Location: Somerset, SW England
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Agreed, that's good work with attention to detail and plenty of thought put into it too.
But how does it sound? 
__________________
The truth need not be veiled, for it veils itself from the eyes of the ignorant. |
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10th September 2006, 08:50 AM
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#8 |
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diyAudio Member
Join Date: Nov 2004
Location: New Zealand
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Sound
Nuuk..........sounds great. this is the third LM3875. I had just finished a dual mono LM4780, but was not happy with the sound. It had heaps of power and 40,000uf of filter caps as well, but i think these LM3875's do sound better. I had to try the LM4780, just to see if there was a difference. I think this chip is slightly more cleaner sounding
The LM4780 gives a great punch but lacks the subtleties and the finesse of the LM3875, oh s......t i don't know, it just sounds better  Anyway I'm very happy with the sound
__________________
I realized that a major part of my job was to figure out how to use technology control to create economic force, or leverage, such that money and business flowed in Microsoft's direction” — Alex St.John, father of DirectX. |
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