Hmmm..., I suspected that this might provoke a response or two. I haven't downloaded the other documents yet, but 'The Power and the Glory' has provided myself and my colleagues with huge entertainment - Although Mr. Andrews assertion that the mains fuse should never be replaced with anything rated less than 13A, for any piece of equipment could arguably be considered dangerous. I do realise that the quality of a CD player could be significantly impaired with a 3A fuse in the mains supply though. That's why all my audio equipment has it's own fusion reactor, connected via superconductors to the stripboard. The cryogenic cooling system makes the listening environment quite cold and noisy, but the sound quality is amazing.
Mr. Andrews could possibly make more money by turning base metals into gold. Oh no - I just realised that he's doing that already - with copper. Steve. > -----Original Message----- > From: John Haddy [mailto:[EMAIL PROTECTED]] > Sent: 10 January 2002 02:25 > To: Open Topic Forum > Subject: Re: [OT] Nothing to do with Protel, but anybody want to improve > the quality of their Hi-Fi? > > > > > > -----Original Message----- > > From: Abd ul-Rahman Lomax [mailto:[EMAIL PROTECTED]] > > Sent: Thursday, 10 January 2002 12:54 PM > > To: Open Topic Forum > > Subject: Re: [OT] Nothing to do with Protel, but anybody want to improve > > the quality of their Hi-Fi? > > > > > > At 05:41 PM 1/9/2002 +0000, Stephen Casey wrote: > > >Check out > > > > > >www.russandrews.com > > > > > >I have learned a huge amount from Mr. Andrews. Mains voltage > variation of > > >10% can have a +/- 1% effect on playback speed of CD's. > Amazing, don'tcha > > >think? > > > > It would be amazing, yes. But I don't believe it at all. Perhaps some CD > > player somewhere was not crystal-controlled. But I also doubt > that anyone > > who did not have perfect pitch would be able to detect a 1% variation in > > playback speed, and it might be difficult with perfect pitch > > (unless the CD > > output was being compared with some standard). > > > > > Oh yes, and over three thousand UK pounds for speaker cables - they > > >must be very good! He also sells woven earth wire, to rewire > > your home with. > > >Could make a big difference. > > > > In the weight of your wallet! > > > > I looked at one of his publications, The Power and the Glory. > > > > From that PDF: > > > > "The mains voltage has a surprising effect on the performance of a CD > > player. The motor speed is voltage controlled, not frequency controlled > > with a crystal reference as most people would expect." > > > > This person doesn't expect motor speed to be crystal-controlled! > > I'm not an > > audio engineer and I have never seen a CD player design, but a CD > > player is > > simply a device for reading data, I'd then expect that the data > is loaded > > into a FIFO memory and from there to a DAC; the rate of data transfer to > > the DAC would be frequency-controlled, so motor speed is irrelevant, as > > long as the drive can read data fast enough to keep the FIFO > from running > > out of data. Someone correct me if I'm wrong! > > Especially since a CD is constant linear velocity (i.e. the rotation speed > [r.p.m.] slows as the read head traverses from the inside track > towards the > rim of the disc)! > > Ccertainly the clock rate of the digital components would have a > measurable > effect on pitch and tempo of the music (note that I wrote "measurable" and > not "audible" :-). > > However, systems like CD players will have a either a crystal > oscillator or > a ceramic resonator providing their frequency reference. At the cheap end > of the crystal oscillator scale, a frequency accuracy of 100ppm over the > life of the component would be usual (i.e. 0.01%). Ceramic resonators are > lower spec, but you'd still expect 0.5% or better. > > Although oscillators can be "pulled" by supply voltage variation > (the amount > of "pull" being a function of circuit design), the logic + clock > supply of a > CD player will certainly be regulated, so variations in mains supply will > have a negligible effect on the logic supply, and hence the clock. > > I browsed through most of the brochures on Mr Andrews' site and concluded > that there's a much easier way to make money than my current job > - just sell > high end audio accessories! Just about any claim can be made, because > apparently there's a willing audience willing to believe! > > Still the brochures provide some light entertainment to read on my lunch > break! > > John Haddy * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
