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Signal Generator

I am kinda building a signal generator with the help of a 555 timer IC. The purpose of this circuit is to produce square, sinusoidal, and triangular waves with an adjustable voltage range of 0-1V and a frequency range of 1-10 kHz. The problem I am facing is with the filtering stage using op-amps. I cannot achieve a smooth output wave. Could there be an issue with the way I am implementing it? (I have added several potentiometers to adjust the frequency and amplitudes of the waves.)

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This one is the one of the results which is works.

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  • \$\begingroup\$ I am not familiar with this topology. I would like to learn more about it. Open to source recommendations. \$\endgroup\$ Commented Nov 27, 2024 at 13:49
  • \$\begingroup\$ Have you got simulation results? Are they different from prototype results? \$\endgroup\$ Commented Nov 27, 2024 at 14:05
  • \$\begingroup\$ I added a result. For your second question: There is no prototype, I just combined what i found in internet. \$\endgroup\$ Commented Nov 27, 2024 at 14:41
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    \$\begingroup\$ Using a filter to "convert" a triangle wave or square wave to something approximating a sine wave will work if the frequency is fixed. This is because a fixed filter can attenuate the harmonics present in a square or triangle wave. However, if the frequency can vary over a wide range, (such as a decade) you will not be able to filter the harmonics properly with a fixed filter. You sine wave will appear "distorted" at some (or all) frequencies. \$\endgroup\$ Commented Nov 27, 2024 at 14:49
  • \$\begingroup\$ @MathKeepsMeBusy Is there a way which I can use for my problem? I would like to learn. \$\endgroup\$ Commented Nov 27, 2024 at 17:15

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