Re: Re: Hmevision ir transmitter

["Frank Mc Alinden" <armagh@xxxxxxx>]

Hi Andy
            It was
getting confusing and i think its better that only one or
two people give advise at this stage. You Have done really well i think
so
keep at it. Yesterday i built my version of the tx circuit . Of course
tested it on the bench before connecting to hv . Fixed 1 wiring problem
and
then tested the operation of the mux and checked current draw by the leds
.
All appeared ok so decided to connect to hv. Well it didnt work ,it
transmitted ok but my tv would not respond . I also have an ir rx in
the
room so i pointed at that and looked for the led on it to lite, no joy.
Anyway i think the problem might be that im using an opto coupler on
the
incoming ir data (4n28) and its not fash enough . I will keep trying and
if
i get it to work and if you are having no joy i can build you or send
you
the drawing whichever .
        Can we upload pics to Marks Site
if so how and when i(if i) get it
working i will sent some pics.

Frank Mc
---- Original Message -----
From: "andy_powell_is" <ukha@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Saturday, June 01, 2002 9:59 PM
Subject: [ukha_d] Re: Hmevision ir transmitter


>
> Mmmm.. I was just getting to grips with the whole thing!
>
> First up if you are like me with your level of electronics I can
> heartily reccommend Circuit maker
> (http://www.microcode.com/downloads/student.htm)
whcih allows you to
> input information on the components' datasheet.. any calculations
are
> then done on 'real' information... (No afiliation.. blah blah...)
>
> If you take a look at: (WARNING BIG PICS!!!)
>
> http://www.automated.it/homevision/board1.jpg
> http://www.automated.it/homevision/board1.jpg
>
> you'll see that I've got something working!!! On board 1 you can
see
> the switch that I use to simulate an ir trigger... on board 2 are
14
> LED's one push lights all the LEDs..
>
> I appreciate that the circuit can be simplified very much using
Ian's
> B+D's circuits, but seeing as I've just brought a bag of
transistors
> I'm happy to use those rather than buy yet more...
>
> The initial board design was the top half of:
>
> http://groups.yahoo.com/group/ukha_d/files/HVIR.jpg
>
> i.e. from the red +5v connection line upwards..
>
> Which I assume works...(since Mr Doxey was the one who mentioned
it)
>
> Frank suggested earlier in the thread that it would probably be
> better to split the design.. Ie use the HVIR.jpg board to connect
to
> individual zone 'boxes'.
>
> This does 2 things.
>
> 1) simplify the connetion to Homevision, since the actual IR
emitters
> would be 3.5mm jack sockets and not actual emitters..
>
> 2)allows building and testing in stages...ie allows zones to be
built
> and added as and when needed.. rather than building an 8 zone 8
> emitter all at once....
>
> I like the initial design from Ian B, primarily because that's
where
> we started from, and secondly because I have the parts... Some
people
> (Ian B himself!! ) may say that it's not a good design (I wouldn;t
> know) and that there are much better ways to do it.
>
> What I do know is before this started I didn't even know what a
> transistor was...I've learnt (lol) a lot from this which I think
is
> useful..
>
> If everyone wants the new design then fine, but I'd really like to
> look at this one more closely, especially as it seems to work..
>
> and a  question...
>
> If one circuit draws 1mA and you replicate that circuit, will the
2
> circuits together draw 2ma or is there a special calculation to
work
> that out?
>
>
> Andy
>
>
>
> --- In ukha_d@y..., "Ian B" <Ian@M...> wrote:
> > Good catch on the design. It was late last night after a fun
time
> with the
> > new baby.
> >
> > I agree about the recent post of messages being confusing to
say
> the least.
>
> the
> > device is active is from collector to base. Hopefully this
makes
> sense (and
> > I am correct).
> >
> > Ian B
> >
>
>
>
>
> For more information: http://www.automatedhome.co.uk
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>



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