Op-amp oscillator circuit - square, triangle, sine waveforms

[louie]

Does anyone know of any good oscillating circuits that are able to produce square, triangle, and sine waveforms (or any combination of these waveforms). The circuit that I'm constructing has to vary in frequency and is limited to using high-speed op-amps and other general components (resistors, caps, etc. - no special IC's).

Thanks in advance

[Cliff_J]

Wein Bridge

Search a semiconductor manufacturer like national for the triangle wave outputs, they'll have documentation on using op amps to get it like Linear Brief 23.

I'll let you figure out the square. :)

Cliff

[Averagesupernova]

This sounds suspicously like a school assignment. Just remember that a current souce feeding a capacitor causes a linear ramp voltage to form across the cap. Figure it out from there.