[sdiy] Using analog for physical modeling

[Matthew Smith]

Quoth Tom Wiltshire at 21/09/11 18:44...
...
> The FPGA and a codec chip wouldn't take up much space.
 > The various power supplies needed might be more of a
 > pain to sort out. If it's going to be a BBD
 > replacement, it ideally needs to run off
 > typical analog voltages (+9V, +12V, +15V etc).

I've got a couple of FPGA board designs on the go (I prefer to create my 
own development boards, because that's the way I roll ;-) and have found 
it's not a huge job.

A little switcher to get down to 3.3V (I'm actually using a BIG 
switcher, which I can feed with anything from about 5V to 40V,) then an 
LDO linear regulator to get the core voltage.

That's assuming you've chosen a part that only requires two voltages, 
such as the Xilinx Spartan 3 AN series, which is what I'm looking at for 
my digital VCA/ring modulator, that we have discussed recently.

Funny that Tom should mention typical analogue voltages, as I was about 
to ask what supply voltage range should my digital modules accept? Both 
this and my ADSR/LFO will use board-level regulation and not require 
such things as a clean 3.3/5V supply.

-- 
Matthew Smith

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