Re: Re: DIY IR receiver - finding parts & advice.

[ian.bird@xxxxxxx]

OK, my guess is that the receiver will send around demodulated data.
From
that you then need to know the voltages concerned. You mentioned the
supply
is 12 volts I think and it is easy to get the 5 volts needed for most
receivers from this, just a voltage regulator and a capacitor or two.
Once
you have that you then need to know whether the signal line is 5 or 12
volts. If the latter then a transistor would be needed. Finally you need
to
know whether the signal line is low or high 99% of the time.

The most expensive bit would be the receiver at around 1.50 ish give or
take. The other components come to a quid or so as well. Not bank
breaking
stuff but you do need to know the answers to the questions before you
set
off. If you have a voltmeter etc. these would not be too difficult to
find
out.

As far as plugging in an IR emitter I assume this plugs into a box of
one
sort or another. If this is the case you cannot assume anything on the
input as the box may do stuff you are unaware of e.g. re adding the
carrier.

> Well I'm really getting into this soldering lark (it's all your
fault
> BTW ;-)), so I would prefer to find a homebrew solution.
Just get the answers and off we go. Glad I could get someone else into
the
art of destroying electronic components in the most exciting way
possible.
One of my other victims still holds the record after literally blowing
one
of the three legs off a transistor to make a diode ;-)) 'Must read the
diagram more carefully' I think he said........

Ian





                                                                                                                                      
                     
"Justin                                                                                                         
                     
<justin@gadgetjun       
To:      
ukha_d@xxxxxxx                                                       
                     
kie.net>" <justin       
cc:                                                                                    
                                              
Subject:  [ukha_d] Re: DIY IR receiver - finding parts &
advice.                       
                     
28/01/03
14:03                                                                                                  
                     
Please respond
to                                                                                               
                     
ukha_d                                                                                                          
                                                                                                                                      
                                                                                                                                      




--- In ukha_d@xxxxxxx, ian.bird@c... wrote:

> The circuit you posted is a complete receiver and transmitter that
will
> replace all your Xantech stuff. From your post I assume you only
want the
> receive bit, am I correct?

Um...not sure now :p

> Assuming I am you need to find out whether the Xantech stuff pumps
around
> modulated or demodulated signal.

Can I assume that as a regular emitter can be hooked up directly to a
Xantech receiver the output is modulated?

I don't know as sadly I cannot afford
> Xantech stuff.

Neither can I really - had to sell a kidney :-)

Demodulated means the IR 'carrier' (the 38KHz bit present
> when the IR has to be sent) has been stripped from the signal and
the
> receiver simply puts out an on or off for relatively long periods
of time.
> This is how the epanorama circuit works and it is the GP1U52X
which
does
> the stripping. The 7555 simply puts the carrier back onto the
signal for
> sending out of the IR transmitter so the equipment can recognise
it.

Thanks for the summary.

> I believe Comfort do an IR receiver that may work for you although
I don't
> know the code for it. If you don't have an answer by tonight let
me
know
> and I will look it out.

Well I'm really getting into this soldering lark (it's all your fault
BTW ;-)), so I would prefer to find a homebrew solution.

Cheers,
Justin.

>                      
<justin@xxxxxxx
To:       "ukha_d@xxxxxxx"
<ukha_d@xxxxxxx>
>                      
kie.net>
cc:

>                                               
Subject:  [ukha_d]
DIY IR receiver - finding parts & advice.
>                      
28/01/03
12:09

>                      
Please respond
to

>
ukha_d

>

>

>
>
>
>
> Just before Christmas a purchased some Xantech bits from the
States, one of
> the
> items, a "Hidden Link" IR receiver, has died :(
> A replacement is most likley out of the question due to shipping
costs so I
>
> thought I would look around for some homebrew solution I could put
in the
> Xantech enclosure.
>
> I was thinking of using this circuit:
> http://www.epanorama.net/documents/ir/irremote.html
>
> Anyone using that circuit? Is there something better I
could/should
use?
> I don't know where to get a GP1U52X (tried Maplin). Any pointers
or
> equivelents?
> This would be wired back to a Xantech block so I guess would need
to get
> convert the 12V input to 5V but I'm not sure how to do that!
>
> Any advice appreciated.
>
> Cheers,
> Justin.
>
>
>
>
>
> http://www.automatedhome.co.uk
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