I'd like to double the frequency of a triangle wave oscillator. The frequency is variable, and the range is within audio range, so 20Hz to 20KHz. The oscillator output is about 1.5V peak to peak, 0V centered.
I think I just need to rectify the negative (or positive) side of the triangle, then restore the amplitude using a gain of 2x, then correct the offset to get the same kind of output of the original.
Can anyone show me a simple and elegant way to do that? I tried to do some experiment but failed, since I'm not an engineer but just a beginner hobbyist, so I still cannot use opamps properly.!
This is what I tried so far: 
But I get something like this: 
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