RE: Re: Multi-output amp

[Shane Harrison <shane.harrison@xxxxxxxxxxxxxxx>]

I went for a plain PCB edge connector and doubled up pins to increase
capacity.

I wasn't keen on supplying mains to each board in the rack - safety and
convenience issues.  Having a torodial txfmr will make the cards
"thicker"
although probably not much more than the heatsinks will...

Finding an external supply is pretty easy on ebay, or at least reasonable
transformers and really there is no requirement for huge regulation for the
amplifier rails.

Those are my thoughts for what they are worth.

I'll try and chuck the protel files to you tomorrow  if I remember.  They
are at work and tomorrow is Saturday and we are off for a weeks holiday on
Sunday - hence rushed off my feet at the moment.

Cheers
Shane

> -----Original Message-----
> From: Dave McLaughlin [mailto:dave@xxxxxxx]
> Sent: Friday, 9 July 2004 9:41 a.m.
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Re: Multi-output amp
>
>
> Hi Shane
>
> Sounds very similar to what I had specced out. I have Protel myself so
> would be interested in the circuit anyway. I have no need to sell this
> idea, just offering it to the UKHA community later if it all works. I
> like the tinkering bit myself.
>
> What sort of edge connector did you go for? Just the plain PCB edge
type
> or a DIN41612 style. I am going with the DIN41612 but with the larger
> capacity pins to allow me to supply the mains to each board and have
> onboard toroidal transformers. This is different to my original idea
of
> a single supply. Not sure if this is a good idea, but it means that I
> don't have to design a whopping great supply to try and locate in the
> chassis.
>
> Regards
> Dave...
>
> ---
> Very funny Scotty, now beam down my clothes...!!
> ---
> http://www.v8carlton.com
> http://www.embeddedcomputer.co.uk
> ---
>
>
>
> hitchcocknz wrote:
>
> > Hi Dave,
> >
> > I actually have done a similar thing:
> > 1) 3 zone amplifier using TDA2050 (32W per channel)
> > 2) Single rail 40V supply needed
> > 3) RS232, RS485 or Linet control
> > 4) Rack mountable (edge connector)
> > 5) 4 switchable inputs to each amplifier
> > 6) Electronic volume control
> > 7) Electronic power on/off for each amplifier
> >
> > I had intentions of making it generally available but have got
busy
> > on a different topology for a commercial Whole House Audio system
> > with a company I own.  I also never got around to costing the BOM
so
> > people would know what they were up for.
> >
> > Upshot is that I do have 8 or so boards (double sided SMT) lying
> > around here.  Your power requirements would allow for a lower
supply
> > rail and smaller heatsinks.  No CAN or Ethernet but RS485 or
RS232
> > (actually need to check the RS485 remained on the second layout
of
> > the board).  Only error on the board is that the footprint for
the 3
> > x DS1801 volume POTS IC is too narrow hence need to stand it on
edge.
> >
> > You would be welcome to one or more of the boards (or anyone else
for
> > that matter) for a small amount to cover costs and postage.  Full
> > schematics and in fact Protel layout you are also welcome to, for
> > your own personal use only of course.  Protel layout would allow
you
> > to make more if you required them.
> >
> > Let me know if you are interested - I am sure it would save a
> > reasonable amount of work.  I have been using them at home for
some
> > time and am quite happy with them.  In fact we use one at work
for a
> > Whole House Audio demonstration system.
> >
> > Cheers
> > Shane
> >
>
>
>
>
>
>
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