Re: Can some kind electronics bod help?

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

Hi Paul

> Do I need to use an opto. The original poster used a simple transistor
-
> will this not work as well?

Im sure it would work but you need to know for sure what you are
doing..Using the opto couplers will give electrical isolation between the
2
pieces of equipment....Two very expensive peices of equipment as well
...

Frank

----- Original Message -----
From: "Paul S. Gale" <groups@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Wednesday, February 05, 2003 8:24 PM
Subject: RE: [ukha_d] Can some kind electronics bod help?


> Do I need to use an opto. The original poster used a simple transistor
-
> will this not work as well?
>
>
>
> Paul.
>
>
>
> -----Original Message-----
> From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
> Sent: 05 February 2003 07:25
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Can some kind electronics bod help?
>
>
>
> Hi Shane
>                
On  the original post the guy mentions that the ocelet
> has
> open collector outputs and that the Kustom system  wqs looking
for 5v
> signal..So Paul has the same problem..if an opto is used ..Tie the
> collector
> to +5v via say 100 ohm resistor and connect the emitter to the zone
tx
> line.....Some connection diagrams might help??
>
> Frank
> ----- Original Message -----
> From: "Shane Harrison" <shane.harrison@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Wednesday, February 05, 2003 6:08 PM
> Subject: RE: [ukha_d] Can some kind electronics bod help?
>
>
> > See comments below
> >
> > > -----Original Message-----
> > > From: Paul S. Gale [mailto:groups@xxxxxxx]
> > > Sent: Wednesday, 5 February 2003 1:36 a.m.
> > > To: ukha_d@xxxxxxx
> > > Subject: RE: [ukha_d] Can some kind electronics bod
help?
> > >
> > >
> > > 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?)
> >
> > If you are lucky and the Kustom input has an internal pullup
> > (essentially a resistor to the power rail) then the input will
sit at
> > the power rail voltage when no signal is applied to it.  If
it has no
> > internal pullup then pretty hard to tell with out scoping the
the
> > existing IR signal being fed 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?
> > If the HV expansion board is open collector as Frank thinks, then
you
> > can't really do any damage if you connect them together. 
However with
> > open collector outputs (essentially it is a switch to ground
only,
> > either the output is grounded or not grounded (floating)) you
need
> > something to "pull" the signal up to a positive voltage
when the open
> > collector "switch" is not switched to ground. 
This can be an external
> > resistor (say 10K) or if you are lucky the Kustom has internal
pullups
> > as discussed above.
> >
> > HTH (and makes sense)
> >
> > Shane
> >
> >
> > http://www.automatedhome.co.uk
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