Sending this again to the list.
On Sat, 19 Apr 2003 09:53:16 +0200 "Bryan Jurish" moocow@ling.uni-potsdam.de wrote:
good morning,
... apologies for drawing this thread yet further off-topic...
On 19 April 2003 at 11:53:26, Chris McCormick wrote: [snip]
If you are interested in pursuing this course of action, the following circuit is very simple & cheap to build. We have used this live several times, although I've never bothered to run it into [fiddle~]. It only uses two ICs and follows the same basic principle of the theremin, but using digital componentry (it doesn't produce the very nice sine-wave that a theremin does, but rather makes a horrible and harmonically rich screaming square type of sound wave).
http://mccormick.cx/gfx/digital%20theremin%20(small%20pic).jpg
wow -- i built this one once myself, and while i eventually did manage to get it to behave like a theremin, it also made a great receiver for the local radio station ;-)
i also got a constant horrible nasty ugly feedback-loop-like scream somewhere >= 10KHz, though, which drove my roommates nuts and made the device rather useless as a sound-source -- have you had similar problems? if so, how do you deal with them?
Mine produces a very definite pitch, even if it is pretty screamy. At different points there are several different higher level harmonics coming through modulating a bit with the main pitch, but it's useable. Any other quirks we just worked into the show to add character.
Chris. _________________________________ chris@mccormick.cx http://www.mccormick.cx http://www.sciencegirlrecords.com