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Class D Switching Power Amplifiers and Power D/A conversion

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Old 24th August 2006, 02:42 PM   #21
Bgt is offline Bgt  Netherlands
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Thomas, just take the transformer out, unwind it and put 2 windings on. Thats all realy. You have to cut some pcb track underneath to make it a 2 supply line type of connection.

rt7085, the tone is unhearable in normal conditions and is not related to the psu. Tried that already.
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Old 24th August 2006, 04:14 PM   #22
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Quote:
Originally posted by Bgt
Thomas, just take the transformer out, unwind it and put 2 windings on. Thats all realy. You have to cut some pcb track underneath to make it a 2 supply line type of connection.

rt7085, the tone is unhearable in normal conditions and is not related to the psu. Tried that already.
Hi Bert,

easy for you .

We poor people full of fears need some more instructions .

Please, many people would try SMPS with class D, maybe you have invented something new that is worth to share! Could you post some more datailed instructions (type of wire, number of windings, winding technique, some picture... )

Or maybe you could sell custom transformer like yours. I would buy them immediately. I just need a couple for two bridged AMP1 or two new AMP4 just released from 41Hz.

Ciao

Thomas
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Old 24th August 2006, 06:44 PM   #23
Bgt is offline Bgt  Netherlands
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Quote:
Originally posted by thomaseliot
many people would try SMPS with class D, Could you post some more datailed instructions (type of wire, number of windings, winding technique, some picture... )
Or maybe you could sell custom transformer like yours. I would buy them immediately. I just need a couple for two bridged AMP1 or two new AMP4 just released from 41Hz.
the transf. can only take 150VA. They are not as nice as true smps's. They blow quite easy if you do something wrong to them.
I am getting some more of these so I'll keep you updated and post some pics. Tried the 220VA version with two UCD180's but it blew up at startup because of the 40.000uF caps.
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Old 24th August 2006, 08:45 PM   #24
Bgt is offline Bgt  Netherlands
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some pics

Click the image to open in full size.

Click the image to open in full size.

These were the 220VA ones.
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Old 24th August 2006, 09:04 PM   #25
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Quote:
Originally posted by Bgt
some pics.... These were the 220VA ones.
I red that these trasformers have a minimum load. If it is true why your AMP1 works? Is it stable?

150 VA are enough when using two, with two AMP1 bridged in 8 Ohm. SMPS are nice but i can't find something ready made, noiseless, suiteble for audio.

Your Conrad seem quiet.

Ciao

Thomas
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Old 25th August 2006, 10:24 AM   #26
rt7085 is offline rt7085  United States
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Default Noise

Bgt, you said there was also some noise that would go away after 5 min. This may also be the supply, when it is pulse-skipping under light load conditions. If the supply warms up a bit, its operating point may shift slightly and it may slowly come out of pulse skipping or simply change it characteristics. Pulse skipping, in burst mode may also cause tones, which sound like 'birdies' (fluit toontjes...). This is because it bursts at a rate which is in the audio band. I had similar issues with a switcher amplifier fed by a boost-mode SMPS.
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Old 25th August 2006, 01:17 PM   #27
Bgt is offline Bgt  Netherlands
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Quote:
Originally posted by thomaseliot
I red that these trasformers have a minimum load. If it is true why your AMP1 works? Is it stable?150 VA are enough when using two, with two AMP1 bridged in 8 Ohm. SMPS are nice but i can't find something ready made, noiseless, suiteble for audio.
It works like a charm in my amp. No problem at all. No idling problem. Stable enough. Use it every day.

RT7085: It seems though the noise is an Amp1B problem. When starting the amp. you'll see the switching freq. change to a point were it settles. I will check again.
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Old 26th August 2006, 10:22 AM   #28
Bgt is offline Bgt  Netherlands
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just testing it vs the UCD 180AD and use a lot of different music (classic, synthesized, voice) to hear the differences.
Bass reproduction is excellent(UCD's have a faster attack) and the highs are very present(a bit more than the UCD). Mid section a bit layed back. The amp. sounds utterly satisfying.
The UCD is the more balanced 1.
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Old 26th August 2006, 01:18 PM   #29
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Quote:
Originally posted by Bgt
just testing it vs the UCD 180AD and use a lot of different music (classic, synthesized, voice) to hear the differences.
Bass reproduction is excellent(UCD's have a faster attack) and the highs are very present(a bit more than the UCD). Mid section a bit layed back. The amp. sounds utterly satisfying.
The UCD is the more balanced 1.
Source and loudspeakers? Any preamp? Crossovers?

As I have a large classic music collection, quote some title you tried: we can reproduce togother the comparison.

Ciao

Thomas
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Old 26th August 2006, 06:53 PM   #30
Bgt is offline Bgt  Netherlands
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Quote:
Originally posted by thomaseliot
Source and loudspeakers? Any preamp? Crossovers?
As I have a large classic music collection, quote some title you tried: we can reproduce togother the comparison.
Source= PC dig.out - DAC(dig. in) - passive pre - power amp. - switch box - speakers. All DC coupled(not the amp1b's input section).
Speakers = Driade/JMLabs/Wharfdale.
Passive preamps with DACT SMD stepper or the Aussie stepper. Sold my NAD C272+C162 and rotel 980 series last year. They were no match for the UCD's.
crossovers = no.
Music = only wav files because mp3's are usually inferior quality.
You can find the titles in another thread where I compared the BP to the UCD's.
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