john curl said:And I still can't enjoy CD in my car, because I find it annoying. Go figure. (Maybe, if people tried harder to make better sounding equipment, this would not be so?)
Except last week you said some CD's on the right players were good enough to demo equipment at the CES, make up your mind.
john curl said:
Rumour has it that a Sony hoshot wanted to record a certain piece of music on a single CD, and that due to the length of the piece thaty had to go to 44.1k to make it fit. Could be just a rumour, but I've read it at several places.
Jan Didden
Joshua_G said:
Joshua,
You're almost there. Now lose all the FETs and everything east of it, and connect the opamp input to the top of C3. Real low noise! 😉
Jan Didden
john curl said:
Unobtanium. So much for some oustanding engineering ideas.
Sleep well, you are safe.
😀janneman said:
one should add, that you need a reliable pre-regulator, if you want to set the reference voltage by resistors only.
I don't trust the FET current source + resistor approach either.
But this could be a preconception of mine.
regards
In fact the debate about the audibility of pre-ringing has still not ended, but there are some hints that pre-ringing might indeed be a problem.
That´s the reason why some people think it could be a nice idea to return to asymmetric filter design, see for example Julian O. Smith.
Afair Lesurf too has written about some papers on this subject.
That´s the reason why some people think it could be a nice idea to return to asymmetric filter design, see for example Julian O. Smith.
Afair Lesurf too has written about some papers on this subject.
Jakob2 said:
I may be kicking in an open door here, but maybe we should remember that pre-ringing isn't. What happens is that the main signal peak is delayed and that what we think is pre-ringing is just the start of the signal, slowly (relatively) building up, with a delay, to the main peak.
I hope we can agree that this preserves the causality.
Jan Didden
Joshua_G said:
The noise at the Fet gate will always be smaller than the noise at the source.
Jan Didden
Joshua_G said:
Ahh, you're no longer using the opamp follower, then? I missed that.
Jan Didden
janneman said:
Normally pre-ringing and post-ringing is meant related to the main portion of the signal under observation.
It would be a nice concept, if my digital filters could begin to respond right before playing any signal. 🙂
Pre-ringing and post-ringing are a fundamental part of why the sampling theorem works. It is the ringing that bridges the gap between sampling points, allowing the original signal to be created.
I wonder whether a small resistor like 10R might be useful between C2, C3 and the gates of the 2SK170s to stop any possible oscillations between them ??
Patrick
Patrick
This regulator that Joshua_G has designed, is essentially what is used for the low noise regulator in the Vendetta Research SCP-1, 2 for that last 25 years, and it works pretty well, IF the load current is relatively constant. I use a Nichicon Muse or equivalent electrolytic cap in order to not have any magnetic leads on the cap(s) as well.
Well, it's not really a regulator in my book, it is a follower, but that may be semantics.
Question John, how do you set the Vout? Do you select Q1?
Jan Didden
Question John, how do you set the Vout? Do you select Q1?
Jan Didden
- Status
- Not open for further replies.