[Nuke]

just use an astable multivibrator, its less complex than the support circuitry to an ic, you can key in different capacitors so that you can change the osilation speed and thus the pitch.

[Colonol Dekker]

An astable multivibrator is what year 10 students do at school, its four resistors two transistors and two capacitors right?

[Nuke]

something like that. but you know what they say about the simpelest soution.

[Colonol Dekker]

Bill gates avoids it at every possible oppertunity?

[Kosh]

I'd prefer to work with IC's simply because I haven't done so in such a long time.


I have been looking for a couple of hours, but I am not certain which ICs I should use. Maybe I am not certain how to do this kind of research (as I have never done it before).....

[Nuke]

if you want to go the ic route just use a 555, its fairly common and theres at least a few in every electronic device you can get. i think you can change its timing interval and you could run its output pulse directly to a speaker. then your keypad would probibly be used on the control side and somhow use it to tell the 555 at what speed to operate. ive only used one once in a robotics kit but i never quite understood how it worked. i even downloaded a proggie called electronics workbench, which supposidly can be used to design and simulate the function of circuits, i think you can even print a negative if you want to cut a pcb, anyway i tried to make a circuit that does what youre looking for, and failed miserably..  as usual wikipedia is a little bit sketchy about it too, anyone know a good online resource for wannabe electronics engineers?

[Kosh]

The PIC16F87X looks nice too. Now I just need to figure out assembly language.