Instructables

Building a Synth: Getting the Oscillators working.

Picture of Building a Synth: Getting the Oscillators working.
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Here are some photos of an oscillator design that I have been working on recently.
I came up with a simple design for an oscillator using an op amp, a capacitor, and four resistors.
The object of this project is to get some good oscillators working to use in a synth.

The schematic for the oscillator is included in the photos.
If you have any questions about the project, don't hesitate to ask!

Jensen
I would put an ac coupling cap at the output to remove the dc component.
jensenr30 (author)  pizzyflavin1 year ago
Yeah. I agree completely. If you were going to play this sound through a speaker or try to amplify it, that would be a good first step.
where would the outputs be so you could pass the signal to a filter or something else
jensenr30 (author)  insanepoetry1 year ago
The output of the Op amp will do nicely.
you will get a square wave out of that end. It would be a good idea to use a buffer (unity gain amplifier) to amplify that signal first (so that the filter itself doesn't interfere with the frequency and characteristics of the oscillator).
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alternatively,
If you want to use a "shark fin" wave, you'll have to put a second (preferably unity gain) amplifier on the positive node of the capacitor. then the output of that second op amp will be where you would connect your filtering circuit.