Re: Audio Op Amp power


"Winfield" <winfieldhill@xxxxxxxxx> wrote in message
news:1186714169.509967.5470@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
On Aug 9, 9:25 pm, "Jon Slaughter" <Jon_Slaugh...@xxxxxxxxxxx> wrote:
I guess a few things I'm not sure of besides running at the min voltage
is
if order matters and if I should do things even though its not necessary.

For example, I need to filter the input and amplify it. Does it matter
which
order? (of course it shouldn't but maybe it does in practice) Also,
should I
buffer the input first even though its going to an amplifier that I would
imagine also is sorta acting like a buffer.

I think I could probably combine the filter, buffering and amp all into
one
circuit and just use one op amp?

Jon, it's admirable to make a circuit from scratch, but
you can first work with a professionally-designed circuit
to see how it works and get some experience. One issue
is making the hardware-software interface work. For
example, many digital audio compaines, such as Creative
and E-Mu, use 24-bit 48 or 96kHz A/D converters with a
standard audio/digital interface data stream called ASIO.
Most of the relevant hardware is available cheaply on
eBay, to help you get off to an easy start.

For example, the Creative USB Sound Blaster, Audigy 2 NX,
(model SB0300) has two stereo 24-bit A/D inputs and both
USB and optical outputs, and meets the ADIO standards.
You can get used ones on eBay for $40 to $70. This one
went for $40, although that was likely a bit of a fluke.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170134761750

USB Sound Blaster Live! may be another possibility.

If you want better, more professional, but still cheap
stuff, check out E-MU products on eBay, like the 0202.


If your saying I should first work in the software out I have already played
with some FIR's(mainly delays) using matlab and non-real time processing. I
long time ago I got interested in asio a bit but never really could find
decent information on it. (Steinberg has some SDK or something. Although I
thought about first doing my project entirely for the pc and using either
VST's or asio I think I'd rather learn about the hardware(I'm mainly doing
this for the hardware. Conceptually I think I got it down but I know thats
only part of it).

Besides, the newer sound blaster cards are pretty bad. The Live and Audigy
both have some type of "glitch" problem where they overload the pci bus and
cause the computer to "stutter". (I do have the audigy 2 BTW)

In any case I do not think the software side is going to be an issue(simply
convolutions) and I have done enough programming in my time that I can
figure that part out on my own. What worries me is the hardware... but I
guess that might be why I want to do it ;)

Thanks,
Jon


.

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