RE: Motion Sensors

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

Hi Guys,

Another approach is to use a low drop out variant of the 317 regulator,
especially if an accurate 10V is required. They are widely available.

Cheers
Shane

> -----Original Message-----
> From: Frank Mc Alinden [mailto:armagh@xxxxxxx] 
> Sent: Saturday, 10 August 2002 8:09 p.m.
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Motion Sensors
> 
> 
> Hi Ian + Tony
>                    
You can also use a 9v regulator and put 2 
> diodes in series with the common terminal to ground ,this 
> effectively "Jacks it up " to 10.2 -10.4 V . Ive done this
> whenever i need an odd voltage.
> 
> HTH
> 
> Frank Mc
> ----- Original Message -----
> From: "Ian B" <Ian@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Saturday, August 10, 2002 6:00 PM
> Subject: RE: [ukha_d] Motion Sensors
> 
> 
> > Hi Tony
> >
> > Most regulators require a 3 volt gap between required and supply
> > voltage. Also 10 volts is not an off the shelf voltage. The 
> solution 
> > would be to build your own using something like a 15 volt 
> power supply 
> > and then an adjustable regulator to bring it down to ten.
> >
> > Of course a 12 volt supply with three diodes in series 
> would do the same
> > job. A diode drops .6 volt so 3X.8 = 1.8    12 -
1.8 = 10.2 
> Close enough?
> >
> > This is the KISS principle in action. (Keep it simple stupid)
> >
> > I rewired my node 0 (well, James H did actually, I was 
> moral support) 
> > because of that same problem with lack of power sockets.
> >
> > Ian
> >
> > >-----Original Message-----
> > >From: Tony T [mailto:tonyt@xxxxxxx]
> > >Sent: 10 August 2002 07:26
> > >To: ukha_d@xxxxxxx
> > >Subject: Re: [ukha_d] Motion Sensors
> > >
> > >
> > >> It is indeed 12 volts from a supply(ies) under the 
> stairs i.e. node 
> > >> 0.
> I
> > >use
> > >> CAT5. It is doubled where necessary because of the 
> current draw but
> that
> > >is
> > >> only one place. Keep an eye on the current per pair 
> though. I think 
> > >> something like 300 ma is the max. Double the pairs and
almost 
> > >> double
> the
> > >> current available. I have 1.2 amp supplies for the rooms
> where the 
> > >> ring runs.
> > >>
> > >
> > >Thanks Ian,
> > >
> > >I may stick to just building dc distribution at node 0 for
now, as 
> > >this
> is
> > >where I have most of the dc gadgets at the moment.
> > >I did see somewhere, can't find them at the moment, some 
> pc blanking
> plates
> > >with 4(?) dc outlets which you could switch the voltage on
> and they 
> > >draw power from the pc psu. I think a couple of these may
solve my 
> > >node 0
> power
> > >problem (currently have a 6 gang outlet, plugged into 
> another 6 gang
> outlet
> > >to get enough sockets at node 0), though I'll probably 
> need to fit a
> better
> > >psu.
> > >
> > >The one thing I cannot seem to find is a 10v regulated
wallwart 
> > >supply
> for
> > >my wavefinder. But I guess I could use a 12v supply and use
a
> regulator(?)
> > >to draw down to 10v?
> > >
> > >Thanks again,
> > >Tony T
> > >
> > >
> > >
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