[sdiy] cheap sine wave osc

[Scott Gravenhorst]

Derek wrote:
>Hi all,
>
>I'm planning a small light-activated installation, based a bit on the 
>Russian ANS synthesizer, and I'm wondering what the easiest, cheapest 
>sine wave oscillator I could construct would be. It will not be voltage 
>controlled, in fact the frequency of each of the oscillators will be 
>fixed, with tones produced by additive synthesis and the gain controlled 
>by photopotentiometers. Any suggestions for a chip/circuit that I could 
>easily make 64 or more of?
>
>thanks + best,
>derek

How accurate must the sine be?  

There's the ICL8038.  

I did another one with a sawtooth oscillator using a 4069UB and a wave
shaper using (I think) 2 more 4xxx ICs, but it has the requisite glitch and
it's less accurate than the 8038 since I use soft clipping to turn a
triangle into an inaccurate sine - however, it sounds like a sine to me. 
8038 likes to get hot when you power from the suggested +/- 15volts.



-- ScottG

-------------------------------------------------------------

-- Scott Gravenhorst
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