Re: Sine wave generators

On Sat, 31 Mar 2007 15:02:40 +1200, "Roger Dewhurst"
<dewhurst@xxxxxxxxxx> wrote:

What is now the easiest way to go for sine wave oscillators to work on fixed
frequencies near the middle of the audio spectrum? Are there off-the-shelf
chips that will do the jobs?


You don't mention the intended application or the quality needed.
The Intersil ICL8038 function generator is a one-chip solution (plus a
few passive parts) that gives sine, triangle, and square and is easily
tuned over the audio range. Distortion is about 1%, typical of all
"function generator" oscillators, which shape the sine from a
triangle.

Most low-distortion circuits have the drawback that they require
tracking potentiometers for tuning, though these days digital
pots with "perfect" tracking make that much easier.

The simplest way to make low-distortion signals iswith
your Windows computer and sound card. You can use
the signal generator in my Daqarta software to make
sine waves with much lower distortion than most any
bench-top oscillator you are likely to afford. Plus you
can make all sorts of other waveforms, and you can
apply AM, FM, phase modulation or PWM, bursts,
sweeps, etc... all at once, if you need to! You can
have 4 of these oscillator "streams" per left/right channel,
and one stream can modulate others to get dizzying
complexity.

Daqarta is nominally shareware, but the signal
generator is essentially freeware since it continues
to work after the trial expires. You are welcome to
use it this way as long as you like.

Please let me know if there are any questions or
problems.

Best regards,


Bob Masta

D A Q A R T A
Data AcQuisition And Real-Time Analysis
www.daqarta.com
Scope, Spectrum, Spectrogram, Signal Generator
Science with your sound card!
.

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