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RE: Can some kind electronics bod help?


  • To: <ukha_d@xxxxxxx>
  • Subject: RE: Can some kind electronics bod help?
  • From: "Paul S. Gale" <groups@xxxxxxx>
  • Date: Tue, 4 Feb 2003 12:36:10 -0000
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx

Thanks guys.



Yes - it seems that the Kustom amp is based on 5V IR signals - how could
I tell for sure without a scope? Would a digital multimeter give an
accurate enough reading on the IR lines? (or should the IR output from
the wall controller be the same voltage as the supply voltage?)



What I want to do is take up to 6 IR outputs from the HomeVision
expansion board (which I have) and feed each one into each of the 6
zones of the custom amp (at the amp in node0 by connecting in parallel).
This way I can directly 'inject' IR into the Kustom system without
having to fit an IR emitter (driven by HV) at each of the Kustom wall
controllers (the wall controller has an emitter and receiver built in).



As both Kustom and HV seem to use 5V, should I just try it without any
electronics? Given they're both 5V could I do any damage? Is all this
talk of transistors not needed as both systems run at 5V?



Unfortunately I don't have any diagrams of the Kustom system - I could
ask their tech support guys but I don't think they'd release anything.



Paul.



-----Original Message-----
From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
Sent: 04 February 2003 11:05
To: ukha_d@xxxxxxx Subject: Re: [ukha_d] Can some kind electronics bod help?



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.
> > > >
> > > >
> > > >
> > > > ++++++++++++++
> > > >
> > > >
> > > >
> > > >
> > > >
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> > > >
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