Hello gentlemen,

lately, I saw a lot of attempts to get schematic drawings of circuitry 
over the email line using ordinary sign characters, e.g. backslash or 
underscore or the like.

Please keep in mind that these signs may make up a sensible sketch on 
your screen as you send it down the line, but on others like mine there 
appears a crazy heap of lines and signs making no sense at all (without 
redrawing it all, trying to understand what has been meant). It all 
depends on the font, character set and size, tab- and line spacing the 
different mail programs are using. You can't be sure that aligned 
characters stay aligned when they are displayed on a different system. 
The main problem with this is the use of national and especially 
proportional fonts.

So, please use picture (graphic) formats for mailing drawings instead of 
this seemingly simple way. You can draw on scratch paper with a pencil 
which is easier than constructing pictures by means of the normal 
character set.

Thank you

Peter Blodow



Erik Christiansen schrieb:
> On Fri, Dec 10, 2010 at 08:51:51PM -0800, Kirk Wallace wrote:
>   
>> On Thu, 2010-12-09 at 22:26 -0800, Kirk Wallace wrote:
>>     
>>> On Thu, 2010-12-09 at 20:06 -0800, Kirk Wallace wrote:
>>> ... snip
>>>       
>>>> I also wired this up:
>>>>
>>>>                     +--------- O'Scope
>>>>   _   _             |
>>>> _| |_| |            |   C1 .01uF
>>>> -----------\/\/-----+---||--+
>>>>             R1 15k          |
>>>>                             V (gnd)
>>>>         
>> ... snip
>>     
>
>   
> To provide a "window comparator" function, similar to the effect of a
> PLL tone detector like the NE567, or a suitably programmed AVR, just
> connect the two comparators of an LM393 like so:
>
>                                +5v
>                       |\        |
> +5v-Ru--|-------------|+\      2k2
> GND-Rv--|  e.g. 3v    |  \      |
>                       |   \_____|             # It's open collector
>                       |   /     |             # so the outputs make
>                       |  /      |             # a "wired AND" here.
> >From C2 -------|------|-/       |
>                |      |/        |
>                |         LM393  |
>                |      |\        |
>                |------|+\       |
>                       |  \      |
>                       |   \_____|______ High => 1v < VC2 < 3v
>                       |   /
> GND-Ry--|  e.g. 1v    |  /
> +5v-Rx--|-------------|-/ 
>                       |/
>
> N.B. Input is to inverting input on the high threshold comparator, and
> non-inverting on the other. 
>
>   


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