Re: Re: Multi-output amp

[Dave McLaughlin <dave@xxxxxxxxxxxxxxxxxxxxx>]

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...!!
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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
>