Variable capacitors

[C.B. - Boudio]

Something I've been lately thinking about: would it be possible to use a variable capacitor, as found in older radio's and tuners, to make an equaliser with a stepless variable frequency? (usually the mids, then)
Or are there too much disadvantages to even consider it?

 

[RuudNL]

Most variable capacitors as used in (AM) radio receivers are 500 pF max.
So if you want to use them in an audio circuit, this means that you have to use very high impedances!

 

[gyraf]

There is a company doing this, the audiotales 1951.

if you want continuous tunable, it's probably better to tune inductance (variac)

Jakob E.

 

[C.B. - Boudio]

Most variable capacitors as used in (AM) radio receivers are 500 pF max.
So if you want to use them in an audio circuit, this means that you have to use very high impedances!

That's something I thought about as well.

There is a company doing this, the audiotales 1951.

I'll look into that.