VCF with inductors

[Paul Perry]

At 10:19 AM 2/10/97 +1000, rowenal wrote:
>I noted Jon's question and started thinking
>
>A crossover in a speaker box uses inductors to define the cutoff frequency.
>Is it feasable to use a transformer type arangement, that is an inductor with 
>some extra turns around it, to form a variable inductance ? The extra turns 
>would have a DC voltage applied accross them to give a electro-magnetic
effect, 
>and this DC voltage would be the control voltage?
>
...why yes, this is a saturable core reactance, as used in power control
systems a million years ago.....as the DC saturates the magnetic core the 
inductance falls.....but you do not get the sort of ranges you want for
most Emusic applications......

paul perry melbourne australia