Re: Can some kind electronics bod help?

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

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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