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Class D Switching Power Amplifiers and Power D/A conversion

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Old 25th March 2009, 09:21 PM   #111
Eva is offline Eva  Spain
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The purpose of class D is to achieve small, light weight, efficient amplifiers.

Why such a massive case?
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Old 25th March 2009, 09:40 PM   #112
luka is offline luka  Slovenia
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So you don't sell only air, more easy to justify the price
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Old 25th March 2009, 10:32 PM   #113
hreith is offline hreith  Germany
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Hi Eva,

You do not need it for the technology, but it is often pleasing to the eye and the man who built this obviously enjoys it.
He also owns a pre-amp from AVM and wanted both products to match optically.

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My cases are made of 1.5mm aluminium, reinforced where the transformer sits. The reinforcing is not necessary for operation, but rather for shipping.
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Old 1st April 2009, 09:49 PM   #114
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Very beautiful setup!
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Old 18th April 2009, 11:38 PM   #115
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Quote:
Originally posted by Randy Knutson
Very beautiful setup!

Yes - and VERY fine sounding. I drive two Altec 604E in 9cub.ft. cabs with this power-amp: great. Sensitive, transparent, "airy" mids and highs, very natural - absolute clean and "dry" bass.
I really was surprised - after using some tubes before - of this sound reminding me of extremely fine tubes.
High-efficency speakers like the Altecs (around 104dB) usually don´t really like transistor-amps.
They tend to sound a bit cool and "flat".
Not with this switchers - really stunning!

best, Klaus
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Old 6th May 2009, 05:04 AM   #116
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Hi
Just finished this one ...
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Old 11th May 2009, 09:17 PM   #117
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This one's for camping and visiting folks.
A TA2024 for portable use along with some A5 sized ply speakers made from drivers from a cheap pair of PC speakers.
About 3W+ drivers, Neodynium and shielded.


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Only genuine 70's speakers will do
It runs from a 12v 2900maH AA nimH pack, that weighs about 340 grams and cost £15, top up recharged with a 4W solar panel. I have since added some Elna Silmic IIs into the Power Supply and modded the input caps too. It sounds pretty good for the size and overall weight of it and the batteries last ages.
The bass is fantastic, compared with the original speakers anyway
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Old 15th May 2009, 06:24 PM   #118
jalejos is offline jalejos  Spain
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My surround amplifier (5 channels)

The box (330w x 230d x 40h mm)

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The 5 UCD180:

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Inside with Coldamp power supply:

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Finished:

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Old 15th May 2009, 06:55 PM   #119
jalejos is offline jalejos  Spain
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...and now, in two blocks version (2 + 3 channels)

2 channels with UCD180HG stereo, toroid and 40.000uF cap.

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2 blocks. Rear view:

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2 blocks. Front view:

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At home, connected to Audiolab 8000AP Processor:

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Old 15th May 2009, 07:21 PM   #120
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Quote:
Originally posted by jalejos
My surround amplifier (5 channels)
...
Nice!
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