Sound Circuts?

I was wondering if anyone had any simple sound circuts with variable pitch?
It doesn't have to be very fancy just beeps and boops ( beeps and boops are preffered actually) Ii just need something that can create sounds with variable pitch and of any length

Comments

[Articas]

Sorry I probably didn't explain this well but I am using this for a simpple synth/keyboard

[Articas]

like just turn a knob change the note

[jeff-o]

Oh, you want beeps AND boops? I've got you covered! http://www.instructables.com/id/Thingamaplush-Robot/

[Articas]

i suppose this could be very useful thanks anyway

[jeff-o]

It's based on the Thingamakit, which is slightly more generic and perhaps better suited to your needs: Thingamakit

[.Unknown.]

If you're after something really simple, and low voltage, try this from frickelkram: http://www.instructables.com/id/Morse-tone-generator-low-power-CW-beeper/

[rickharris]

By far the easiest option is either a 555 timer sound effect cct or a dedicated ic that makes the sort of sound you need.

http://www.getlofi.com/?p=3132

http://www.rapidonline.com/Electronic-Components/Integrated-Circuits/Timers-Signal-Gens./M3720-4-Siren-generator-IC/36138

http://www.rapidonline.com/Electronic-Components/Integrated-Circuits/Timers-Signal-Gens./SMC0608S-6-tone-Sound-generator/75837