RE: Can some kind electronics bod help?

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

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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