Wah: resistor in series with inductor?

Started by Arno van der Heijden, August 25, 2004, 09:25:48 PM

Previous topic - Next topic

Arno van der Heijden

Anybody ever tinkered with a small resistance (33-47 ohms) in series with the inductor in a classic wah circuit?
A lot of the 'classic' inductors have a series resistance of ~50 ohms, while the inductor of my Vox V847 only measures about ~20. I wonder what effect this might have on the sound....

According to my simulations higher resistance gives somewhat smaller resonance peaks in heel-down position....

R.G.

Resistance in series with the inductor lowers the "Q" of the inductor - that is, it causes the inductor to lose energy faster in any resonant situation, and so the resonance is less pronounced. Notice that resistance in parallel or series with an inductor will eat up resonant energy and lower Q.

Either way, having a resistor eat energy out of the inductor causes a wider and lower resonant hump in a wah.
R.G.

In response to the questions in the forum - PCB Layout for Musical Effects is available from The Book Patch. Search "PCB Layout" and it ought to appear.