----- Original Message -----
Sent: Thursday, June 27, 2002 8:15
PM
Subject: RE: [ukha_d] Lite Control
Network- LINET
Thanks for the congrats Frank. All is
well.
The
hybrid nodes are the chips mounted on a small PCB (DIL20W size) with
supporting components. The second set of pricing I gave were for the
SMD
chips only.
Dimming unit is the next thing, so answer is
no. The nodes have a zero crossing detect input and a PWM output so
the
drive signals are there. Anyone out there got a low EMC dimming
circuit
and layout available ?
As
for the 2 zone stereo module. I am using bits and pieces I have lying
around. Hence I went for TDA2050 (around 30W per channel I think)
amplifier chips. Volume contol is using DS1801 (probably same as
Keith's
?). Control is via linet node. Used node in data mode which spits out
a
serial stream. Decided to decode the serial stream with a PIC since
it
is probably the cheapest way to do it and gives a few outputs easily.
Currently laying out the PCB which will be mounted in a 19 inch rack I have
lying around with edge connectors for the backplane.
Interestingly I decided on having source switching
on
another card as a design decision. Meaning I was originally only
going
to accept one source into the amplifier cards. However I decided to
add
the ability to switch between two sources so that I don't need to design a
rack mounted source switching card up-front. In-fact at this stage I
am
not sure how many sources I will really use. Intention is to have
usual
stereo hi-fi gear in family and living rooms so this system will only be
used
for lower volume background home audio. I have a sense that soon a
dedicated MP3 player as a source for each zone won't be too costly and
might
be the only source needed in reality - interested in others views on
this. However for "PA" type announcements eg. TTS, does require a
second
source. Hence the design decision to switch two between two sources
on
each card. Switching is via relays (because I have plenty) and I
expect
that I will have to control the volume when switching to avoid the clicking
?
Finally I have switched the 40V feeds on the
amplifiers so I can turn each zone on and off beside muting
them.
As
for user interface - I just don't know at this stage. RCS keypads or
web
tablets or both in different places. Via homevision or Misterhouse or
comfort or ..... My mind is still busy on this
one.
Audio and hardware design aren't my strong points
-
was a hardware engineer of sorts for awhile but changed to software.
So
anyone feel free to comment etc.
Cheers
Shane
Hi Shane
Firstly congrats on your new arrival, hope all are ok. I
take it those prices are just for the chips? Have you had a chance to put
some form of dimming unit together yet ? How about more info on your
2
zone stereo module sounds interesting.
Frank Mc
For more information:
http://www.automatedhome.co.uk
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