[sdiy] cheap twin oscillators?

[Scott Gravenhorst]

If you don't care about voltage control, an LM556 dual timer IC could make 2
oscillators with square wave output.  There should be example schematics for
a "multivibrator" in the data sheet (download this from the web).

Lee Mulvogue <lee at baudalign.com> wrote:
>G'day
>
>Just wondering if someone can point me in the right direction for schems to 
>a simple, cheap twin oscillator?
>I want to make a circuit to give me a "power hum" sound (like a 
>high-voltage transformer), and I was thinking maybe twin oscillators 
>slightly out of phase?  Do you think square waves with a very crude 
>low-pass filter to round them off a bit would do the trick?
>As I said, cheap and simple are the keys here, so I'm thinking maybe a dual 
>IC of some sort?  Any help would be greatly appreciated.
>
>Thanks
>Lee
>lee at baudalign.com
>
>

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