How about do it in digital way? An osillator, a ripple counter, an EPROM, a
R-2R network, and optionally a low-pass filter. Osillator can be as simple
as a cap and a resistor plus a schimitte trigger. Ripple counter can be
CD4040. Save the pre-calculated sine waveform in EPROM and use the counter
to read this waveform out. This may not be as simple as you expect but can
produce fairly stable sine signal.

-Raymond

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Nick Veys
Sent: February 20, 2002 2:34 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE]: Sine wave generation from simple components.


I've seen generating sine waves using PICs and other associated
"complex" hardware in the archives.  And can find a /couple/ web sites
showing some oscillator and integrating amp sine generators but none
seem too complete or tested.

I'm curious how I could go about generating a (roughly) 0-5 Vpp sine
wave, in the range of 1Hz or less...  It doesn't have to be very
accurate, just simple, and generate a periodic wave.

I'm looking for something made from (fairly) basic components (op amps
probably being the most complex), no 555 timers, etc, that's cheating!

My engineering schooling is limited on the EE side (more digital) so I
can't seem to come up with something that works! :)

Thanks!

nick@veys.com | www.veys.com/nick

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