Triangular and sinusoidal signal generator

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bagineaniulia

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Hi!

I have to generate a triangular and a sinusoidal signal. I taught about using a Wien bridge oscillator for generating the sine wave, but I don't know how to convert it into a triangular one. Can it be done dirrectly or I have to transform it into a square wave first?
 

Usual lab function generators are taking the opposite approach. Generate triangle wave with integrator and Schmitt-trigger (two OPs), convert to sine with pulse shaping network. E.g. implemented in obsolete ICL8038.
 

A switched capacitor lowpass filter IC can produce a pure sinewave from even a squarewave. I made a 10-steps waveform with a logic counter and a switched capacitor lowpass filter IC smoothed it into a sinewave that is so pure that its low distortion is very hard to measure. I used a triangle waveform only one time to make pulse-width-modulation.
 

The XR2206 is another simple to use IC that generates square, triangle and sine waveforms.

It is also obsolete, but it can still be found on the web.
 

Hi ,

Generate the Pulse signal using 74HCT04 with R,C or 74HCT04 with C and crystal.Then pass this signal to single harmonic LPF to get sine wave .Pass the pulse signal to integrator to get the traingular waveform.
 

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