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Re: Lite Control Network- LINET



Title: Message
Hi Shane
            Just a quick one , Why do you need a pic between the stereo module and the Linet node? I assumed the Linet node would have i/o available to control the digital pot...
 
Also i seen a circuit in circuit cellar of a  4 audio (line level i assume)way selector using a 4052 cmos chip. I thought about using 2 4051 chips which would give 8 sources. Just a thought...
 
Frank Mc
 
ps  had a look at the pics isnt she cute.
----- 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
-----Original Message-----
From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
Sent: Thursday, 27 June 2002 9:33 p.m.
To: ukha_d@xxxxxxxSubject: 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
 

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