[Adding randomness]

I have a little sound generator project i have brought and managed to put together.

[9v + (2xAAA) = ????]

Wow, thanks for all the suggestions.  just to recap though ...
1)If i put a 3.3v regulator/relay before the 3Amp kit I can power them off the same source.  Whats the proper name for these things, just so i know what to get.
2)If i did the above thing then i could control them with the same switch, as they would both accept the same  current thing.  If not, then get a 2 pole switch that would control both circuits.
cheers.
Shaun

[9v + (2xAAA) = ????]

I have built two little kits I got from maplins.  One has a 9v battery and the other has 2xAAA batteries.  The 9v one is a sound generator and and the other drives a couple of little motors.

I would like to control them both with the same on/off switch.  Could i wire them both into the same switch or would the differing power sources cause problems?  Could i piggy back one off the others power supply? 

Any suggestions?

Shaun

[art project]

I suppose I would also like to be able to control the speed of the motor and the volume/pitch of the noise.  The two are not related though.  On/off switch would be nice as well.

I see your projects page has a few motor sine wave projects on it.  I should be able to string a couple of them together shouldn't I?  How would I get a random fluctuating pitch for my noise?

[art project]

Having had a play with a soldering iron at the weekend and managed to (correctly) wire some portable speakers into a little "sound to light" electronics kit, i want to get a bit more adventurous.