The first stage of this process will be to find and build a suitable sine wave audio generator. When i say 'suitable' i mean 'cheap and easy to make'. So i built this very basic 1khz test generator where the components minus wiring and board cost $1.30 (probably cheaper if buying online in quantity). It has quite a bit of noise which will need to be filtered out, but the sine wave itself seems to be relatively pure considering the cost...
In order to turn this into a tune-able generator, i think the two resistors on the right need to be replaced by a twin pot in series with two small resistors. But i haven't tried this out yet...
This project is one that will take some time to get off the ground. However, it will be worth it.
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