# turn a square wave froma 555 into a sine wave?

Thanks,

Josh1324

PS. It has to be analog, im not getting into microcontrollers or anything digital.

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How it Works »New Instructable »I would like to know how to smooth out a square wave to turn it either into a sine wave or at least a triangle wave. Or if it's not possible i would like to know how to make a sine wave generator to use as a lfo thing for a home made synth.

Thanks,

Josh1324

PS. It has to be analog, im not getting into microcontrollers or anything digital.

Thanks,

Josh1324

PS. It has to be analog, im not getting into microcontrollers or anything digital.

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active| newest | oldestFor the purest waveform, you generate a sine wave directly, not clip up a 555.

Most of the time, I'd use a DDS chip, but if you're staying analogue, your choices are a bit more limited.

Look for the really old electronics mags from the late 60s-70s when everyone was trying synthesiser designs.

Thanks,

josh1324

The integrator effectively adds up its input constantly, so if you imagine that the input square wave is of unit height, its adding 1+1+1+1+1+1+1+1 - which is increasing linearly, and then adding -1-1-1-1-1-1-1-1-1-1 decreasing linearly - and there you have a triangle wave.

Like I said, the old synth stuff is the place to go for details.

Steve

Steve

Differential a study of diffrerences in grose fisioligy branch,

Integral a study of L&M bounds strength branch,

Once you spend two or more years of study

then a great many questions of this nature become as you understood.

All of electronics even hanging wires is described by math and unferstood because of imaginaru numbers.

http://en.wikipedia.org/wiki/Operational_amplifier_applications#Inverting_integrator

Qa

1.) square

2.) integrator

3.) triangle

4.) sine

It's all there, complete schematic with parts and build notes. Can't ask for more.

Qa

Thanks a lot

Just put in the min and max values for your resistors and the capacitor value. You will get the range of those components, albeit one step at a time.

Qa

Here again asking silly questions, but I tried the theory and circuit you provided from the calculator, and using my oscilloscope, the pulses aren't proportional, the positive pulse is twice as long as the negative pulse, how can I fix this? I'm using simple values of 1K for resistors and 0.1 for capacitors therefore giving me a frequency of 4.8KHz ..

Refer to this crude example, but you can prob get the idea

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All the help is appreciated!

Thanks in advanced

thanks

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