RE: Can some kind electronics bod help?

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

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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