I’m quite new to; this list, and to the hole HA
game.
But, I’m eager to learn more about the zone amplifier you
have.
Are these parts readily available (can I buy them over the web ?) I
have
a little electronics experience
(I
know what components are… I can solder… etc
etc..)
Any more information on this, or any info of where I might be able
to
buy one (that has been assembled by someone else) would be most
appreciated
Regards,
Jonathan.
-----Original
Message-----
From: Shane Harrison
[mailto:shane.harrison@xxxxxxx]
Sent: 27 June 2002 11:15
To: ukha_d@xxxxxxx
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
-----Original
Message-----
From: Frank Mc Alinden
[mailto:armagh@xxxxxxx]
Sent: Thursday, 27 June 2002
9:33
p.m.
To: ukha_d@xxxxxxx
Subject: Re: [ukha_d] Lite
Control
Network- LINET
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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