Re: Help needed: Resistor S.O.T.

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Article #2674

#2674

From: Mark Robinson (JO PhD)
Date: Thu, 09 Apr 1992 08:55

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In article <1992Apr7.144316.4559@cfmu.eurocontrol.be> christophe@cfmu.eurocontrol.be (Christophe Paquay) writes:
[ascii deleted (nice though it was)]

>    The above described scheme is extracted from a TV PAL encoder which
>  I try to realize. Unfortunately, I'm facing a problem with the resistor,
>  because I don't hnow its value. The only reference I have is "S.O.T.".
>  If somebody is able to help me by giving any information about this
>  resistor, please send me a message.
>                    I'm awaiting anxiously your information.
>                        
>                               Many thanks in advance, C. PAQUAY

SOT stands for Select On Test. Not very helpful I know, but the idea is
to start from some reasonable first approximation and jiggle the value until
the circuit works as desired. Its cheaper than a pot!

Without more detail I can't really suggest a good starting value, but
I assume its a burst gate generator so the idea is to set the RC time 
constant to something like the duration of the colour burst pulse and
then adjust it to cope with differencs in gate thresholds etc.

Mark
mark-r@snow_white.ee.man.ac.uk

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Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!uknet!mucs!mark-r
From: mark-r@ee.man.ac.uk (Mark Robinson (JO PhD))
Newsgroups: sci.electronics
Subject: Re: Help needed: Resistor S.O.T.
Message-ID: <4553@m1.cs.man.ac.uk>
Date: 9 Apr 92 08:55:37 GMT
References: <1992Apr7.144316.4559@cfmu.eurocontrol.be>
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Reply-To: mark-r@spec0.ee.man.ac.uk (Mark Robinson)
Organization: Dept Electrical and Electronic Eng, Manchester University, UK
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