[sdiy] Understanding Analog Computer Schematics?

[cheater cheater]

You can take two triangle waves 90 degrees out of phase,
four-quadrant-ringmodulate them together and get a sinusoid at double
frequency and i think half or 1/sqrt2 the amplitude. It will be a
sinusoid with a small amount of harmonic distortion on top of it.
Nothing noticable, or maybe even something desirable.

HTH
D.

On Wed, Feb 25, 2009 at 3:49 AM, Dave Manley <dlmanley at sonic.net> wrote:
> A quarter cycle of a sine wave is a pretty close approximation of a
> parabola.
>
> I was surprised to see how close.
>
> -Dave
>
> harrybissell at wowway.com wrote:
>>
>> close enough for YouTube... can you tell the difference in the video ?
>>
>> <lol>
>>
>> H^) harry
>>
>>
>>
>> On Mon, 23 Feb 2009 21:07:14 -0500, Aaron Lanterman wrote
>>
>>>
>>> Although for Most Accurate Results, I think it should be quadratic,  not
>>> a sine wave.
>>>
>>> - Aaron
>>>
>>> On Feb 23, 2009, at 7:27 PM, harrybissell at wowway.com wrote:
>>>
>>>
>>>>
>>>> A resonant filter triggered with a pulse, followed by an absolute
>>>> value circuit. Vary the Gain, the Resonance, and the Frequency ???
>>>>
>>>> H^) harry
>>>>
>>
>>
>> Harry Bissell & Nora Abdullah 4eva
>>
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