[sdiy] analogue equations

[Mark Rivera]

> The question is, though, what components make the specific functions of say, this wave multiplied by that wave, or this wave divided by that wave...

You might think of amplification as a simple approach to multiplication, 
with division being multiplication by something less than 1.

If you use an opamp in non-inverting configuration, the feedback 
resistor controls the gain (multiplier). If you have a wave controlling 
the feedback "resistor" value by proxy via voltage controlled 
resistance, you get multiplication.

Or I think so anyway. <g>

You should have a look at generic examples of opamp circuits, as well as 
the examples in the LM13700 datasheet; they're very informative.

http://cache.national.com/ds/LM/LM13700.pdf


Mark