Here's something I found on a website while looking for easy ways of not putting an air-variable cap in a tone circuit:
There was no example provided and no math. I'm curious - has anyone ever done this to fake a varicap? Say, use one as the bottom C and one as the top C, with the spread between them being the Q?
Ok, the real question: how would these be best hooked up, and how to find the f center? It seems a tad funky to me actually since I've never done this. Would it be similar to a wah-wah circuit used in old guitar effects?
If it works as advertised, I wanna try it in a tone stack and see if I can't get what I'm after with two caps and not have to use a variable anything cept a pot. 'T would be beautifully simple and stupid for me![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Here's a trick to simulate a variable capacitor, especially useful for tone control applications. Attach two different capacitor values to a potentiometer--moving the wiper then sends more or less of the signal to one of the caps thereby changing the frequency response.
There was no example provided and no math. I'm curious - has anyone ever done this to fake a varicap? Say, use one as the bottom C and one as the top C, with the spread between them being the Q?
Ok, the real question: how would these be best hooked up, and how to find the f center? It seems a tad funky to me actually since I've never done this. Would it be similar to a wah-wah circuit used in old guitar effects?
If it works as advertised, I wanna try it in a tone stack and see if I can't get what I'm after with two caps and not have to use a variable anything cept a pot. 'T would be beautifully simple and stupid for me