VCF with inductors

[Prof. Antonio Guerrieri]

>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

That's true.

Antonio