Variable Capacitor Replacement?

Do you think it would be possible to substitute a variable resistor and a normal capacitor for a variable capacitor?

The way I figure it is that a variable capacitor is supposed to adjust how fast said capacitor charges and discharges, wouldn't a variable resistor and a normal capacitor also function like this?

I'm working on an idea for a small am radio, and looking to substitute these parts. Could it work?


verence5 years ago
No, for a (very) limited number of circuits, it might work, kind of - for a very limited definition of 'work'.

If you don't want to learn more:
No, doesn't work this way, sorry.

If you want to give part of your soul to the imaginary wisdom:
It will not work, because a resistor has a real resistance while a capacitor has more, it has an impedance. That is a frequency depending kind of resistance. That is, for a single given frequency, you might replace a capacitor with a combination of a resistor and another capacitor. But not for any frequency.

If you want to spent some time (well, okay, a lot of time) with learning about the imaginary part of impedance and mathematics and such, you might add a new dimension [pun intended] to your knowledge.
lemonie5 years ago
No, they don't work like that, which is why these components get used as they are used.

No, you misunderstand completely capacitor action. The capacitor forms part of a tuned circuit.