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Old 7th July 2004, 06:23 PM   #1
myskja is offline myskja  Norway
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Default smoothing of square-wave? - building a synth

i am building a synth out of four oscillator that i found on this page:

this is really a resistor-tester, i think, but through the use of potentiometers it is possible to play on it. so far i have tested 2 oscillators together, and each time i sit down with it i make new sounds by adding other components, like capacitators.

i am completly new at working with circuits, and there is one thing that bothers me, and i can't find a solution: first of all, i don't think it's a real oscillator... and that leads to the problem, because when i tested it with a oscilloscope-program, the curve never went down below the middle. the second problem is that it delivers a square-wave, and i would like it to be a sine-wave. i don't know how to change that.
i have found some info on how to smoothen a signal with a capasitator, but i don't know if that is adaptible to my project.

i have found some oscillators on the net, but they all include components that i don't have, like jfets etc.

so i guess my question is: what can i do (with the basic components i possess)?
(perhaps you think this is the easy way out, asking others for help... but you must know that i have worked alot on this... raiding the dumpsters of electronic stors for old radios and TV's, fighting with broken components... the list is long, and i am old and tired, and in a hurry)

thank you so mutch in advance
(ps. i am new to this forum, so be gentle)
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Old 7th July 2004, 07:56 PM   #2
dhaen is offline dhaen  Europe
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It is easy to convert any waveform into a sinewave with a filter, but only at a single frequency ie the frequency that the filter is tuned to.

If you want a variable frequency sinewave oscillator, I suggest using a "wien bridge oscillator". Here's an example:
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Old 10th August 2004, 05:06 PM   #3
myskja is offline myskja  Norway
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hmmm. is what you said about the filters true?
i now have an op-amp, and i am going to build a wien bridge oscillator.

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