simple way to add harmonics to a fundamental signal

[Paul Perry]

At 12:54 PM 25/05/99 +0200, Rene Schmitz  wrote:

>What about LM1496-type ringmodulators, I've a neat schematic for a
>dc-coupled ringmodulator at my website, two of these properly cascaded will
>give you x^2 and x^3 at the simultaneously. 

I dont know enough trig for this..
I know that putting the same sine wave into a multiplier gives a sine at twice
the frequency, but what does one do for the 3f? anything simpler than just 
multiply 2f and 3f and cancel out the f component?
In the Burr Brown nonlinear handbook there are fairly exotic feedback loops with
a multiplier in, to give things like trig approximations..

paul perry Frostwave P/L Melbourne Australia