Saturday, 11 April 2015

dc - How to generate 30Hz sine wave?


I'm building a voice ring modulator. Part of it involves a 30Hz carrier sine wave to modulate the voice with. Since I'm trying to build a portable device it will be DC powered, and since a function generator is not really portable or DC powered, I don't thinks that's an option.


Crystal oscillators work at the MHz range so I'm guessing that's not the way to go either. I could play a 30Hz wave on an old mp3 player and use the audio output, but if there's another way involving analog components that'd be much better. There's no need for a lot of accuracy, just any wave from 20-40Hz will probably do, I would say it doesn't even need to be really stable either.


What approach can I take?



Answer



Why not just use a 555 oscillator and an RC network to convert the square wave to a sine wave?


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