[sdiy] LFO, analog computers

[Matti]

Two things on my mind lately, and I was wondering if the list had anything to 
offer.

1)In trying to produce theta waves in the brain, I wondered if I couldn't simply 
set an oscillator to 4-7 Hz, instead of putting one wave with some frequency 
into one channel, and another with a difference in frequency of 4-7 Hz into the 
other. Will normal speakers/headphones output such low frequencies? What about a 
soundcard? Most give a range of 20-20kHz, but shouldn't lower frequencies come 
out fine, or amybe distorted?


2) Can capacitors be made by doping silicon, as chips are? I'm thinking, if they 
can be, a whole lot of sample and holds might be possible to make a sort of an 
analog hardrive; think : one capacitor the equivalent 32(64...) bits of data. 
Might be useful to engineers. Or musicians. Naturally, an analog CPU would be 
most useful with such a device. Has this been done? Can't this be done?

Of course, I don't know very much about computer hardware.

Many thanks for your time.



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