Re: Hmevision ir transmitter

["andy_powell_is" <ukha@xxxxxxx>]

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
> 




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