Re: Can some kind electronics bod help?

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

Hi Shane

            Im
making assumptions.. that Paul is trying to get HV tx ir
signal onto some sort of  tx bus on the Kustom system and that the
Kustom
system is 15v (misread this one... its actually the ocelet thats 15v )
....

>Been writing Perl code instead of laying out a PCB
> :-)

3 zone amplifier ;-)) ?????

Frank

----- Original Message -----
From: "Shane Harrison" <shane.harrison@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, February 04, 2003 9:54 PM
Subject: RE: [ukha_d] Can some kind electronics bod help?


> 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
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