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  1. Old Comment
    abraxalito's Avatar


    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.
    Posted 1st August 2014 at 12:58 PM by abraxalito abraxalito is online now
  2. Old Comment
    miklos's Avatar


    Excellent looking job, gratulations.
    I guess if one would get shorted, the rest would burn the short off.
    Posted 1st August 2014 at 10:48 AM by miklos miklos is offline
  3. 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 ...
    Posted 1st August 2014 at 01:08 AM by fas42 fas42 is online now
  4. 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 ...
    Posted 1st August 2014 at 12:03 AM by fas42 fas42 is online now
    Updated 1st August 2014 at 12:57 AM by fas42
  5. 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 ...
    Posted 30th July 2014 at 04:59 AM by fas42 fas42 is online now
    Updated 30th July 2014 at 05:29 AM by fas42
  6. 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 ...
    Posted 30th July 2014 at 03:23 AM by fas42 fas42 is online now
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