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  1. Old Comment
    fas42's Avatar

    Hexasupercap

    Yes, except I would state it as, a good system, rather than speaker - if a completely unknown piece of music, or style of music is heard for the first time, and makes musical sense then the system is in pretty good shape ...
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    Posted 15th August 2014 at 02:21 AM by fas42 fas42 is offline
  2. Old Comment
    miklos's Avatar

    Hexasupercap

    Fas42.
    Provided at your brain know what you supposed to hear.
    If it's the first time one hear an instrument, or a music piece ,that mechanism has not much to rely on. You have to process information, a good speaker give more information.
    permalink
    Posted 14th August 2014 at 04:58 PM by miklos miklos is offline
  3. Old Comment
    fas42's Avatar

    Doing interesting things with electronic keyboards

    We have a typical cordless home phone setup, and this, as usual, is a problem child. For those who are into hifi terminology, , the sound goes from 'organic' to non-organic - lots of nasty additives, pesticides, msg type stuff, - when this is operating, . Usual solution has been to pull the plug on it, and go back to the old-fashioned variety of handset, just a bit inconvenient!

    Since we're talking about GHz signals here it is not trivial to work out a "smart" solution ...
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    Posted 11th August 2014 at 02:54 AM by fas42 fas42 is offline
  4. Old Comment
    fas42's Avatar

    Hexasupercap

    Indeed I do, ... as I've said before, there appears almost no end in sight to how good the sound can get - 'weight', 'authority' are good ways to describe where the path takes you, a "massive" quality to the sound presentation can manifest, where the sound world created comes across as so much larger than where you happen to be at the moment, . Ambitious 'pop' productions can become amazing places, where you almost feel you should get a ticket to enter, .

    Remarkably, this depth of presentation can be conjured up by very ordinary speakers, it doesn't seem possible at times - but that's the beauty of the ear/brain mechanism, making sense of all the cues ...
    permalink
    Posted 10th August 2014 at 02:52 AM by fas42 fas42 is offline
    Updated 10th August 2014 at 02:55 AM by fas42
  5. Old Comment
    fas42's Avatar

    Doing interesting things with electronic keyboards

    Running the keyboard at realistic volume levels, say for solo piano, works well - but also highlights the strong need to get the interference issue under tight control. Without going the extra steps - at the moment which is shutting everything electrical down which can be heard to affect the sound - then it produces "OK, but ultimately fatiguing" quality ... the hardest step is ensuring an "effortlessness" to the sound. Otherwise, the mind tires of filtering out the residual "edginess" - you lose interest in listening ...
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    Posted 7th August 2014 at 03:17 AM by fas42 fas42 is offline
  6. Old Comment
    fas42's Avatar

    Doing interesting things with electronic keyboards

    Quick comment about conditioning again - I don't know what the underlying cause is here, whether it is a Yamaha thing, an early '90's DAC issue, or that you have a very complex nest of electronics, digital plus analogue all in an integrated environment - but it's quite severe on this unit. Last night got powered down for a number of hours, about 4 or 5 - and the sound had degenerated right back to toy keyboard quality, the treble was abysmal, cymbals were like a hashy, random noise.

    This terrible treble quality in digital sound used to be quite severe years ago - much better in raw gear these days, but still an issue always needing very precise attention to get the best sound ...
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    Posted 6th August 2014 at 11:37 PM by fas42 fas42 is offline
    Updated 6th August 2014 at 11:40 PM by fas42
  7. Old Comment
    fas42's Avatar

    Doing interesting things with electronic keyboards

    Have I mentioned I hate software? ...

    Took the plunge, got a USB to MIDI adapter, and brought a decent MS Vista laptop into the fray. Of course, Vista doesn't know anything about such devices, , so had to hunt around for a kludge solution; a good one was found - but there was a lot of trial and error, and cursing, backward steps, until all was happy. Which means, the Yamaha was happy to be driven by MIDI, and so far I'm very pleased with how it sounds.

    There are milions of MIDI files out there, but the next glitch is that most are set to drive a General version of MIDI, which the Yamaha is too old to know anything about - wrong sounds come out: clarinet rather than pipe organ! Straight acoustic piano is easiest to guarantee a good fit, and so I've tried classical, boogie piano, jazz - works nicely. The grand piano sound is pretty authentic, does an excellent Satie for example.

    The fact that there is an MIDI link may impinge on SQ, but nothing too obvious so far - I'll do some experiments, checking to fine tune this - and work out an easy way to map all the standardised MIDI files to the Yamaha's configuration.
    permalink
    Posted 5th August 2014 at 10:47 AM by fas42 fas42 is offline
  8. Old Comment
    abraxalito's Avatar

    Cheapest 32bit CPU to date...

    I deleted your comment SyncTronX as I couldn't see any relevance to this blog. I kept a copy though so if you can explain what it was about I'll restore it.
    permalink
    Posted 3rd August 2014 at 08:37 AM by abraxalito abraxalito is offline
    Updated 3rd August 2014 at 08:42 AM by abraxalito
  9. Old Comment
    fas42's Avatar

    Doing interesting things with electronic keyboards

    Okay, have run enough simple tests to demonstrate that the two issues to be addressed are:

    * Warm-up conditioning, and
    * Interference

    The unit was made well enough so that it achieves acceptable, for me, quality if those items are taken care of - I don't believe in fiddling just for the sake of fiddling, I have no desire to get under the hood and possibly cause problems, by doing things that typically people want to play with - only if I believe a genuine major benefit is possible would I venture further.

    The warm-up I can solve merely by running 24/7; and work out strategies for fastest recovery time after the unit is powered off, for any of the obvious reasons.

    Interference is the key concern, so I'll try simple solutions first, and build up to more complex approaches, depending upon how it progesses ...
    permalink
    Posted 2nd August 2014 at 12:17 AM by fas42 fas42 is offline
  10. Old Comment
    abraxalito's Avatar

    Hexasupercap

    I have given that some thought - I've only had capacitors go short when overvoltaged though, they overheat and then explode. The total energy storage is about 2.2kJ but very high peak currents are possible so yes its entirely possible that one cap would have vapourized lead-outs.
    permalink
    Posted 1st August 2014 at 12:58 PM by abraxalito abraxalito is offline
  11. Old Comment
    miklos's Avatar

    Hexasupercap

    Excellent looking job, gratulations.
    I guess if one would get shorted, the rest would burn the short off.
    permalink
    Posted 1st August 2014 at 10:48 AM by miklos miklos is offline
  12. Old Comment
    fas42's Avatar

    Doing interesting things with electronic keyboards

    A quick note just to emphasise that when the Yamaha is in the "zone" - like just now - that it passes the Listening In Another Room test. I've got it running its auto Rock accompaniment with solos sequence, and from the other end of the house it's got the bite and kick of something close to being taken seriously. So, how can a miserable 10W amplifier do that? Well, because it's been engineered to work well, and because I've taken some steps to ensure that its full potential is actually realised in the now ...
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    Posted 1st August 2014 at 01:08 AM by fas42 fas42 is offline
  13. Old Comment
    fas42's Avatar

    Doing interesting things with electronic keyboards

    I've been inspired to use this particular exercise as a way of showing how I go about dealing with issues, and Yet Again, the no. 1 lesson is - LEARN HOW TO USE YOUR BLOODY EARS !!!

    There now, was that loud enough for everyone, ? It's a simple thing, but I note that so many run off to their oscilloscopes, and other assorted instruments, or DBX exercises, so that they "know what's going on" - and I suspect their chances of picking up anything of real significance are so close to zero that way ... why bother??

    This is a lead-in to remarking that a fancy keyboard makes the job of learning how the sounds change by doing little things, when the objectivists most likely will insist that they don't and can't, so very easy ... it's trivial to make the electronics repeat a sound pattern over and over again, and for that pattern to be as complex as you care to make it - it's a signal generator, all nicely bundled up in a single, solid box, producing acoustic output. Set up a musical pattern, and then hit the beast - not literally, - with bits of electrical nastiness, and see how it responds. Since it's a "black box" it's somewhat hard to probe various bits - so, fall back to using your ears!

    Right, this all came about because our fridge is on the same circuit as the keyboard - and, it disturbs the audible sound. Not by causing audible glitches, the usual obvious stuff people mention - but the quality of the sound is degraded. As something people can relate to, it's like the difference between using a really 'musical' amplifier, and a so-so one, in a normal audio system.

    So, this post is not about "how to fix this problem" - there are obviously a myriad ways of going about that; it's that one should learn to recognise that this type of thing is going on, and therefore something has to be fixed!! Not, "I don't like the sound of my system - I guess I'd better design and build a better amp" - talk about doing it the hard way, !

    Anyway, enough bluster for the moment ...
    permalink
    Posted 1st August 2014 at 12:03 AM by fas42 fas42 is offline
    Updated 1st August 2014 at 12:57 AM by fas42
  14. Old Comment
    fas42's Avatar

    Doing interesting things with electronic keyboards

    Okay, just looked up YouTube, a few people demonstrating the unit, the best one to get an idea, so far, of what it can do is this - Yamaha PSR-6700 Keyboard 2 Demonstration Songs - YouTube. Note the range of sounds and effects - and, that what you are hearing is a straight capture of the analogue signal, NOT what is coming from the speakers - you can pick this because the camcorder switches back on with noise at the end.

    Imagine an infinite combining and selecting of everything you can hear in that video, plus much more, to give one an idea.

    Now as regards SQ, how it comes across from the inbuilt speakers almost perfectly matches how the video sounds, on my PC speakers. But, now imagine that running at serious high end speaker levels, near maximum volume, and still sounding as crystal clear - won't do it from cold, needs serious running in to make it happen ...

    For a complete contrast, Kris Nicholson Demos His New YAMAHA PSR 6700 Arranger Workstation Video 1 - YouTube and the following videos show what it can do, but the sound quality is appalling!! Just listen to the first voice the chap plays, a grand piano - a million miles from anything worth listening to! So, why is it so bad? Firstly, the camcorder is picking up the sound from the speakers, there's no fudge involved, two losses of quality right there; but mostly the instrument has likely just been switched on, and no effort has been made to improve the quality of the internal sound system.

    That grand piano sound ends up pretty damn good when the instrument is fully wound up to optimum tune; it won't fool anyone, but it doesn't sound like the tinny nonsense in that video ... and that's where the tweaking becomes very important ...
    permalink
    Posted 30th July 2014 at 04:59 AM by fas42 fas42 is offline
    Updated 30th July 2014 at 05:29 AM by fas42
  15. Old Comment
    fas42's Avatar

    Doing interesting things with electronic keyboards

    Very pleased at the moment ... without doing anything too specific to mitigate interference so far it's finally broken through the quality barrier - the essential trick was constantly running it, over many days, most of the time as loudly as was reasonable, allowing all the capacitors and circuitry to stabilise. Hence the quick follow-on update, this only just came about in the last hour or so ...

    Basically this now allows the unit to run at full volume, and still sound extremely clean - the cymbals and drum strikes sound pretty authentic - remember, these are just sampled sounds - and all the layering of the instruments nicely separates, subjectively. Rock styles are very punchy and full, good clarity - even the boring, me-too rhythms work; meaning interesting to listen to - good signs ...
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    Posted 30th July 2014 at 03:23 AM by fas42 fas42 is offline
  16. Old Comment
    jan.didden's Avatar

    Superregs for your line-level projects

    Hi David,

    The answer is a few posts above this.
    Also there is an extensive thread in the forum on customizing the output voltage.
    In addition to sizing the feedback resistor values you should also adapt the output series zener so that the opamp output is around half the Vout.
    And of course make sure the electrolytics can withstand the voltages, and that you have enough input voltage for a few volts dropout reserve.
    Success!

    Jan
    permalink
    Posted 23rd July 2014 at 07:19 AM by jan.didden jan.didden is online now
  17. Old Comment

    Superregs for your line-level projects

    How do you modify this to get +/- 24v out?

    best wishes,
    david
    permalink
    Posted 23rd July 2014 at 04:06 AM by anystereo anystereo is offline
  18. Old Comment

    ESI Juli@ analog card interface details

    1audio,

    I do not read the blogs on a regular basis, so just saw this entry of yours. I believe I have the information you seek. Please contact me at my email, gstewtoo at gmail dot com so I can send you the datasheet.

    Greg in Mississippi
    permalink
    Posted 20th July 2014 at 10:48 PM by Greg Stewart Greg Stewart is offline
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