So what? Surely you don't expect them to accept an explanation they don't understand. I know I wouldn't.
Be sure to wear a grey alien mask and skinsuit when practising this hobby. It makes for much funnier headlines when reported. 😛
It all depends on the impedance at the point where the cap is inserted. If sufficiently low (e.g. at a virtual ground, or at a voltage source) then only a small change will occur. If the point of insertion has inductive reactance then the cap may do more than just a low pass. I understand that a small wiggle in frequency response can be surprisingly audible but not necessarily perceived as a response wiggle.Coris said:
Does it work? Does it improve, or merely modify?
Good. Provided, of course, that there really is an effect to explain. That is, an effect which is not simply low-pass filtering.
Can we move the alien chatter to another thread?
Hi, peufeu,
Knowing what a competent engineer you are from reading some of your posts over at Jocko's place, I'll assume that your above comment was not serious. However, just for the benefit of others who may be wondering, the effect also works tapping one-half of balanced DAC outputs as single-ended. My experiments were done using only half of the differential outputs pins of an PCM1794A. My circuit features Left and Right passive resistor I/V, connected between the positive phased current output pins and ground with the capacitor located in parallel with each I/V resistor. Both phases of each channel are grounded through it's own I/V resistor, but I only tap the positive phases for eventual output.
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SETI's funding is a separate matter from so-called "space exploration." Right now, SETI funding is nearly non-existent. At its peak, it was $2.5M/year. Not exactly "billions." And it hasn't shed any light on the alien abductions and anal probing.
So... instead of typing about OT stuff, why not set up some actual experiments to try to get evidence for the existence or non-existence of this alleged "effect"? I'm amused that the guy trying to collect royalties for it hasn't bothered, but that shouldn't stop you.
I was never meant to discuss about alien in this thread. You should not ask me about this...😉
Well, so we can conclude that the effect is to be obtained not only on a differential path....
What happened with the minus pole of the 1792 output? It is left open?
As far as I know, SY is not moderating this thread - he's here just as any other member.
If he really WAS moderating this thread, you wouldn't be smiling anymore ... ;-)
Jan
No, they are also connected to ground via I/V resistors, it's just that I don't presently utilize their signals. I use my homebrew DAC to both experiment and listen to music through, so I want to retain flexibility for potential future system configurations. With the PCM179x series, the unused phases could instead have been safely wired directly to ground as well.
Thanks for explanations. I may suggest you to try the cap elsewhere (of course the right value), in the chain, as I did, at the preamp inputs (if applicable for you).
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Well, I saw "moderator" on his nickname... I suppose, as one who may have moderator responsibilities, should interact quite different, even as a member... You know, I`m actually not so addicted to this thread. I was thinking that a such discussion it may be beneficial for many others, but after all what I could see, I should reconsider...
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There you suppose wrong, there are quite specific rules for this. Look up the Forum Rules
Jan
Hm, didn't know that.
OK, you gave me an idea : since I'm building a modulus-86 and it needs a preamp, I'm bonna build a preamp also... and since a preamp has input switching relays, I can put an ABX feature in the firmware 😀 then I'll try to abx this magic capacitor stuff.
FYI - I may be mistaken, but I think that Joe Rasmussen has found that the effect only seems to occur with the passive filter located right at the DAC chip's output pins. So, you may need to take that in to account for conducting a an effective ABX listening test. I've only evaluated the PCM1794A + passive I/V configuration I've already described. Joe R. has posted a number of alternate configurations which he says will work in the prior version of this thread - which, while frozen by the moderation team, may still be viewed.
No 'they' are not. 'They' merely want some evidence (beyond anecdote) that the effect exists, and some plausible explanation which either confirms or denies that it is simply a matter of filtering. At present both seem to be lacking. Is this an unreasonable request?john curl said:
It depends on your goal. If you're after what's correct and what's not, it's absolutely reasonable. If you're trying to rationalize hucksterism and maintain an income stream for being a "guru," it's absolutely unreasonable.
Your goal (and mine) is the former. But not everyone shares that goal, so will have different notions of what's reasonable and unreasonable.
We use snubbers and zobels in most amplifier designs. We do this with almost no audible effect. Is this also hucksterism?
I don't understand why we can't discuss the workings of a circuit design without having to prove that it brings magic.
I don't understand why we can't discuss the workings of a circuit design without having to prove that it brings magic.
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