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NNTP-Posting-Date: Sun, 19 Jan 2003 10:03:54 -0600
From: firstname.lastname@example.org (John Fields)
Subject: Re: Choosing the right transformer
Date: Sun, 19 Jan 2003 15:36:31 GMT
Organization: Austin Instruments, Inc.
References: <3E2A306E.64A1B96F@webaccess.net> <3E2A4186.BF5DE7BC@webaccess.net> <4srW9.27782$jM5.email@example.com>
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Chuck Simmons wrote:
>> > > The TI application note would seem to be based on nearly distortion
>> > > reproduction of typical music programs where peak to average ratio is
>> > > 10:1 to 20:1.
Then PA shat:
>> > ** Where did you pluck those numbers from ? Your bum ?
Then Chuck replied:
>> You can find such information in the "Radiotron Designer's Handbook"
>> which, oddly enough, is Australian in origin.
Then PA opined:
> ** The numbers are what ? Power ratios ? Voltage ratios? It matters a
> It looks to me like the voltage ratios of uncompressed speech - which
>gives massive and unrealistic power ratios.
Then I wrote:
Really? Even with a voltage ratio of 20:1, since dB(v)=
20log(V2/V1) that's only 20log(20) = 20log(1.301) ~ 26dB which
corresponds to a dynamic range of about 400:1 for power. For a 100W
amp feeding a 4 ohm load this corresponds to 100W at the high end
(20VRMS) and 250mW (1VRMS) at the low end. Seems pretty realistic
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