Re: Can some kind electronics bod help?

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

Hi Guys
               
The output driver transistor is a pnp tranny with its
collector  tied to +5v ..The signal out from the emitter goes through
a 75
ohm resistor..

As i said  i think  the opto is a good solution just need some
more info on
the Kustom side............

Frank

----- Original Message -----
From: "Shane Harrison" <shane.harrison@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Tuesday, February 04, 2003 7:55 PM
Subject: RE: [ukha_d] Can some kind electronics bod help?


> Ah yes that should make the job a little easier.  Frank should be
able
> to elaborate on what the HV IR output circuit looks like.  I
think that
> the answer is not what value does the resistor need to be but what
> interface circuit do you need since  I wouldn't expect HV to
be
> outputting 15V (although I could be wrong).
>
> Frank - can I dob you in for some information on HV IR output
drive
> circuit?
>
> Cheers
> Shane
>
> > -----Original Message-----
> > From: Paul S. Gale [mailto:groups@xxxxxxx]
> > Sent: Tuesday, 4 February 2003 9:06 p.m.
> > To: ukha_d@xxxxxxx
> > 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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