Bgt said:
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
thomaseliot said: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.
some pics
These were the 220VA ones.
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
These were the 220VA ones.
Bgt said:
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
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.
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.
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.
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.
thomaseliot said:
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.
Thomas, there is nothing more difficult than comparing music from 1 person with his setup to the other with his setup. I can only compare if I have my own references otherwise "you're skating on thin ice"(Dutch sentence). You need some default amps. to compare to. Differences are not that big between amps. and to remember them is even harder. So I have a pile of class D amps. so I can get a honest picture and draw my conclusions. Also asking other people to listen to the differences helps a lot. 1 person(me f.i.) may be too focused on a mod. which he thinks is it and when another person(audio minded) listens to it he/her may find it insignificant.
drowned my coils in plastic so the windings are unmovable on the core.
Now I have to hear what difference that makes.........if any.
And after this the coil of the smps....?? Who knows??
An externally hosted image should be here but it was not working when we last tested it.
Now I have to hear what difference that makes.........if any.
And after this the coil of the smps....?? Who knows??
Ok, did the transf. also.
UCD still is more balanced, more depth. UCD highs are so d.mm clean. Also UCD bass is so tight/controlled and deep.
Did it improve....don't know yet. Have to play some more.
The Amp1B sounds impressive and if I did not have the UCD to compare to you would think...wow, but when you compare it.......hmmmm.....still not there.
An externally hosted image should be here but it was not working when we last tested it.
UCD still is more balanced, more depth. UCD highs are so d.mm clean. Also UCD bass is so tight/controlled and deep.
Did it improve....don't know yet. Have to play some more.
The Amp1B sounds impressive and if I did not have the UCD to compare to you would think...wow, but when you compare it.......hmmmm.....still not there.
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