Yes, i know that clone exists. But it aint the real deal, it doesnt have the same clean squarewave responce and not the same output.
what i am going to build, some day, is a superamp, with as few as possible changes, just more output devices and more power.
I am cluttering around in a pcb designing program now and then, trying to design a pcb thats an exact copy of the superamp. Not so difficult since its only one layer.
the hard thing is getting the tracks right, i have a picture of them in correct size, and on the computer i have one too. Don´t know if it will work, but it is worth a shot.
what i am going to build, some day, is a superamp, with as few as possible changes, just more output devices and more power.
I am cluttering around in a pcb designing program now and then, trying to design a pcb thats an exact copy of the superamp. Not so difficult since its only one layer.
the hard thing is getting the tracks right, i have a picture of them in correct size, and on the computer i have one too. Don´t know if it will work, but it is worth a shot.
Do you have any reference to your claims? I think Jens' pcb is pretty nice and performs well too.
His own webpage. It shows overshoot/ringing at 1khz. The Leach does not have that problem Neither the superamp.
I dont make things up, i read and i write about what i have read. No lies. The info is on his own webpage for all to look at.
I dont make things up, i read and i write about what i have read. No lies. The info is on his own webpage for all to look at.
i dont believe this transient over rail cliping bull ****,i run my amp which is a tda2003(classB) exacly under clipping and there is no notable sound difference from running it quietly,but cant say im an audiophile,
Looked at the square wave on the Delta Audio site, the overshoot looks like possibly improperly compensated scope probe.
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That might be so. I´´m no expert, i just read and watch, and draw my own conclusions after that.
Imagination leads us to some crazy decisions about what we want, often based more on the impressions of numbers and images in advertising than than the basic issues that make audio amplifiers worth the effort of building or not. I thought as the OP obviously does, when I was 20 and new to the possibilities of solid state audio. I now realise, since little has changed in conventional audio amplifier design since, just how wrong it was to believe that technical performance measurements or high SPLs mean much to your satisfaction.
High power is only as good as what other people and the onset of tinnitus will tolerate. Give it about 6 months before it becomes boring or you only use it every so often to remind the community that you are around. In reality, most domestic needs using conventional dynamic loudspeakers, are met by only a few watts power.
Rest assured, the Delta Audio clone suggested by peranders is absolutely as good, if not improved on prof. Leach's implementation. The images of the tests performed are not strictly comparable as they are not to the same resolution. PCB design has also moved on but if you feel more confidence in having the original PCB design, then you are really looking for something more than the audio output. 'Better stick to vintage designs and parts, I think.
High power is only as good as what other people and the onset of tinnitus will tolerate. Give it about 6 months before it becomes boring or you only use it every so often to remind the community that you are around. In reality, most domestic needs using conventional dynamic loudspeakers, are met by only a few watts power.
Rest assured, the Delta Audio clone suggested by peranders is absolutely as good, if not improved on prof. Leach's implementation. The images of the tests performed are not strictly comparable as they are not to the same resolution. PCB design has also moved on but if you feel more confidence in having the original PCB design, then you are really looking for something more than the audio output. 'Better stick to vintage designs and parts, I think.
that would mean that the square wave is perfect, the scope is not. Also, to do it right, every amp should be compensated individually, regardless of how great the circuit is, due to variations in parts and layout.
I suppose some of these newer ultra-super-low distortion designs just self cancel just about everything, so in those amps I have no idea how the heck you would adjust the compensation as you would on a "normal" amp... perhaps one has to defeat some of the distortion cancellation loops... etc...
anyhow...
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I suppose some of these newer ultra-super-low distortion designs just self cancel just about everything, so in those amps I have no idea how the heck you would adjust the compensation as you would on a "normal" amp... perhaps one has to defeat some of the distortion cancellation loops... etc...
anyhow...
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Trouble is that most recorded music has (much) less than 20dB dynamic range...
The Loudness War: Dynamic Range over the years - Hydrogenaudio Forums
http://www.dr.loudness-war.info/
Arne K
The Loudness War: Dynamic Range over the years - Hydrogenaudio Forums
http://www.dr.loudness-war.info/
Arne K
20dB of dynamic range means a 10:1 ratio of highest voltage to lowest voltage.
For a CDP, or similar, putting out a maximum of 3Vpk = 2.2Vac the lowest voltage that can ever occur would be 220mVac.
Show me 3minutes of music recording where the lowest level NEVER falls below -20dB ref 0dBfs.
For a CDP, or similar, putting out a maximum of 3Vpk = 2.2Vac the lowest voltage that can ever occur would be 220mVac.
Show me 3minutes of music recording where the lowest level NEVER falls below -20dB ref 0dBfs.
3 minutes of modern trance music can be found where there appears to be only about 3dB of dynamic range. Even the "breakdowns" register only about -20dB. About the only place where there is any dynamic range is when two tracks are running concurrently (mixed into each other)
Got to be said though today's production standards for this particular style of music is superb. 😀
Got to be said though today's production standards for this particular style of music is superb. 😀
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