[sdiy] Taylor series and sums and difference tones

[Dave Manley]

Dave Manley wrote:
> Aaron Lanterman wrote:
>> On Jun 5, 2009, at 1:36 AM, Dave Manley wrote:
>>
>>> On a related note, Grant Richter has commented that for the best 
>>> sounding multiplication (as in a balanced modulator), you want the 
>>> sine to be very pure, because any components that are not the 
>>> fundamental will result in, to use Aaron's terms, "all sorts of 
>>> junk".  Of course, it depends on how many dB down the stray 
>>> components are.  A sine from a self-oscillating filter is better 
>>> than any sine from a shaper for use in multiplication for this reason.
>>
>> I remember Grant suggesting one that uses the weird properties of an 
>> incandescent light bulb. (I believe it was the Hewlett-Packard design.)
>>
Here's a description of the HP circuit: 
http://en.wikipedia.org/wiki/Wien_bridge_oscillator

-Dave