Re: IC to change frequency of sinewave input
- --- In Electronics_101@y..., "Tako Oda" <toda@m...> wrote:
> --- In Electronics_101@y..., Steve <73227.1605@c...> wrote:that
> > There's a couple of possible ways this could be done, but
> > probably not with just a single IC, and it isn't a particularly
> > easy task to accomplish, either.
> I was afraid of that! It's so easy to do digitally, I got kind of
> spoiled :-) Basically, I'm making an analog musical instrument
> plays two notes at a constant relative frequency interval of 5:1 (aaccomplish
> major 10th). Very much like the 2.5 foot stop on a pipe organ.
> You are absolutely right, though, there are easier ways to
> this (like just using two separate oscillators for each pitch), butlook into an IC called 'Top-Octave divider' - you give it a 'clock'
> it sounded like it would be fun to create both tones from the same
frequency somewhere above what you wish to obtain, and it produces
simultaneous output signals covering a full chromatic 12-tone scale
from say C to C'... Mostek used to make it, I'd bet there's other
available.. then using a simple keying arrangement, analog switches
perhaps, and a summing op-amp, you can produce any chords you wish
to, many electric organs have been designed this way, using simple RC
networks to integrate the square-wave outputs into something more
like a rounded sawtooth...
> Thanks! I'll use my time and energy in more fruitful pursuits :P
> Tako Oda