To:	opendos AT delorie DOT com
X-Comment-To:	"da Silva, Joe" <Joe DOT daSilva AT emailmetering DOT com>
References:	<01FD6EC775C6D4119CDF0090273F74A4021FC1 AT emwatent02 DOT meters DOT com DOT au>
Message-Id:	<2.07b7.1ACD5.G9VMAC@belous.munic.msk.su>
From:	"Arkady V.Belousov" <ark AT belous DOT munic DOT msk DOT su>
Date:	Thu, 8 Mar 2001 14:23:01 +0300 (MSK)
Organization:	Locus
X-Mailer:	dMail [Demos Mail for DOS v2.07b7]
Subject:	RE: Text file format .ASC ? (#1)
Lines:	42
MIME-Version:	1.0
Reply-To:	opendos AT delorie DOT com

X-Comment-To: da Silva, Joe

Hi!

8-Мар-2001 11:31 Joe DOT daSilva AT emailmetering DOT com (da Silva, Joe) wrote to
"'opendos AT delorie DOT com'" <opendos AT delorie DOT com>:

dJ> To answer your last question first, I know the 'm' is representing
dJ> either the Roman letter 'u' or the Greek letter "mu", because the
dJ> text is clearly referring  to the NEC switch-mode chip 'uPC494C'.
dJ> Although the first letter of this chip number is usually shown as
dJ> 'u', I think the "proper" letter is the Greek letter "mu", similar to
dJ> chip numbers such as 'uA741' (ex-Fairchild) ...
dJ> As far as the algorithm or program used - I have no idea. I'm looking
dJ> for clues about this ... After I know what this text format is, my next
dJ> task will be to find a suitable program, with which to either display
dJ> or convert this text.
dJ> I'm not sure how much this will help, but here are the first few lines
dJ> of the file in question (not sure if it will come out right) :
dJ>              пpовеpк  микpосхемы TL494 и ее   логов

     This is Russian text in cyrillic, although some codes looks dropped.
Below I translate this (although my English, especially chipsets related, is
weak).

dJ>                    (OE1114..."4, mPC494C, IR3M02)
dJ> ' сост в этой ^' входит: з д ющий геер тор пилообр зого
dJ>  пряжеия А1, ч стот  геер тор  з д ется вешим резистором R1
dJ> кодес тором C1 и может быть приближео определе  по формуле
dJ> f=1/(C1*R1). R1 включ ется между вывод ми 6 и 7,   C1 между
dJ> вывод ми 5 и 7. Амплитуд  пилы е з висит от оми лов R1 и C1 и
dJ> приблизительо р в  4'; усилитель цепи обр той связи DA2;
dJ> широто-импульсый модулятор, выполеый   комп р торе DA4;

"check for TL494 chips and its logs
        (OE1114..."4, mPC494C, IR3M02)
'contents of this ^' includes: drive generator of sawtooth voltage A1,
generator frequency defined by external resistor R1, condenser C1 and may be
approximated by f=1/(C1*R1) formula. R1 should be inserted between outputs
6 and 7, whereas C1 between 5 and 7. Amplitude of saw not depends from R1
and C1 nominals and approximately equal to 4'; amplifier of feedback chain
DA2; pulse duration modulator, implemented in DA4 comparator"

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