RE: Motion Sensors

["Ian B" <Ian@xxxxxxx>]

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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