RE: Can some kind electronics bod help?

["Shane Harrison" <shane.harrison@xxxxxxx>]

Hi Frank,

I thought that the IR is unidirectional from HV to Kustom.  I also
gleaned that the Kustom System used 5V inputs.  Did you mean Kustom
or
Ocelot when you wrote:

"The impression i get is that the Kustom System tx voltage is 
15v ( circuit diagram would be nice) . The resistor i assume 
is to limit the drive current.."

Agree that the opto is the safest way to go - of course I guess it
means
he needs a source of 5V on the Kustom side from somewhere unless it has
internal pullups.

Anyrate off to bed !  Been writing Perl code instead of laying out a
PCB
:-)

Cheers
Shane

> -----Original Message-----
> From: Frank Mc Alinden [mailto:armagh@xxxxxxx] 
> Sent: Tuesday, 4 February 2003 9:44 p.m.
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Can some kind electronics bod help?
> 
> 
> Hi Paul / Shane
> 
>                        
Like Shane when i read your post it  
> wasnt very clear (to me anyhow)..............
> 
> Homevision switches +5v out when transmitting......via a 75 
> ohm resistor....
> 
> The impression i get is that the Kustom System tx voltage is 
> 15v ( circuit diagram would be nice) . The resistor i assume 
> is to limit the drive current..
> 
> Personally i would use a high speed opto (this is what i use 
> on HV / FirM ) setup  to connect between Homevision and the 
> Kustom mutlizone sysytem..Then both systems are completely 
> isolated from each other..The Homevision side is easy would 
> need more info on the Kustom side though...
> 
> Frank
> 
> ----- Original Message -----
> From: "Paul S. Gale" <groups@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Tuesday, February 04, 2003 7:06 PM
> Subject: RE: [ukha_d] Can some kind electronics bod help?
> 
> 
> > Thanks Shane.
> >
> >
> >
> > The Ocelot bit is just a red herring (it was what the 
> original poster 
> > had - I don't have one). I'm hoping that HomeVision (which 
> I do have) 
> > is the same in/output wise and can be used in it's place.
> >
> >
> >
> > What I'm querying is what value resistor should be used, how it's
> > connected and what for.
> >
> >
> >
> > The problem stemmed from the 'Kustom' amp not liking 
> standard IR input 
> > from other IR distribution systems (Zantec included I think). The
> > poster found that if the output from his Ocelot (or other 
> system) was 
> > connected via a transistor, it would work. Something to do with
the 
> > voltages involved and the transistor acting as a switch?
> >
> >
> >
> > Now, I don't know what the output voltage of HomeVision is when
> > sending IR - it maybe that it will work straight off with 
> the Kustom 
> > Amp - but I didn't want to risk it :-) The Kustom amp needs 5V
> > apparently according to this guy.
> >
> >
> >
> > Does this make any more sense?
> >
> >
> >
> > Thanks,
> >
> >
> >
> > Paul.
> >
> >
> >
> > -----Original Message-----
> > From: Shane Harrison [mailto:shane.harrison@xxxxxxx]
> > Sent: 04 February 2003 07:43
> > To: ukha_d@xxxxxxx
> > Subject: RE: [ukha_d] Can some kind electronics bod help?
> >
> >
> >
> > Hi Paul,
> >
> > I don't think we are ignoring you :-) we are just confused ?
> >
> > >From my electronics experience (albeit limited) the
explanation 
> > >doesn't
> > seem to make much sense.
> >
> > More information on what the Kustom input looks like i.e.
internal 
> > pullup on input or not.
> >
> > More information on the Ocelot's output. I am not sure if level
> > translation and logic inversion is required or just one of them
?
> >
> > Maybe I am simply not smart enough - but I tried answering those
> > questions from the circuit description and it just didn't 
> make sense - 
> > sorry.
> >
> > Shane
> >
> >
> > > -----Original Message-----
> > > From: Paul S. Gale [mailto:groups@xxxxxxx]
> > > Sent: Tuesday, 4 February 2003 4:18 a.m.
> > > To: ukha_d@xxxxxxx
> > > Subject: FW: [ukha_d] Can some kind electronics bod
help?
> > >
> > >
> > > I posted this a while back but no one wanted to talk to me
:-(
> > >
> > >
> > >
> > > Any thoughts?
> > >
> > >
> > >
> > > Paul.
> > >
> > >
> > >
> > > -----Original Message-----
> > > From: Paul Gale [mailto:groups@xxxxxxx]
> > > Sent: 25 January 2003 15:27
> > > To: ukha_d@xxxxxxx
> > > Subject: [ukha_d] Can some kind electronics bod help?
> > >
> > >
> > >
> > > I'm trying to wire into my multi-source, multi-zone amp
(Kustom 
> > > KHS6640). It has wall controllers that pass through IR to
> the amp. 
> > > To be able to control each zone from a central location 
> (or via HV, 
> > > pronto etc), I need to 'tap' into Kustom's IR system. I
found 
> > > someone on the web saying they'd done it by using a 
> transistor (see 
> > > below). What I don't understand is how to add the resistor
as 
> > > mentioned - what value should I use and where should it be
> > > connected? Anyone understand this?
> > >
> > > Thanks,
> > >
> > > Paul.
> > >
> > > ++++++++++++++++
> > >
> > > So I've finally gotten the Ocelot to control a Kustom whole
house 
> > > audio system with no keypads.  All the credit goes to
my 
> father, the 
> > > real EE in the family, but hey, I did the soldering.
> > >
> > > So, the problem is not modulation.  The problem is that
> the Ocelot 
> > > uses some sort of open collector (?) CMOS-based output that,
when 
> > > measured against the Kustom's ground is 15V rather than 
> the 5V the 
> > > Kustom wants, and not to mention that the "steady
state" 
> voltage is 
> > > 15V rather than 0.  So basically all I did was hook up
> the IR to the 
> > > emitter and base of a PNP transistor, and wire the 
> collector to pin 
> > > 3 of the Kustom RJ-45 input.  Done.
> > >
> > > I'm putting a resistor in to make sure I don't overpower
> the Kustom, 
> > > but we're talking about $3 in parts compared to a $99
keypad.  
> > > Woohoo!
> > >
> > > Anybody wants some Kustom keypads let me know. :)
> > >
> > > Thanks to the Ocelot folks for wiring diagrams and 
> assistance.  They 
> > > continue to rock.
> > >
> > >
> > >
> > > ++++++++++++++
> > >
> > >
> > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
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> > >
> > >
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