http://www.taydaelectronics.com/inductors/560uh-inductor.html
may be a dumb question, but i'd never seen this sort of inductor before and wondered if it would work...regardless of whether or not it would sound as good as an actual wah inductor.
That inductor is 560uH. In wah pedals we normally use ~500mH inductors. The inductor you linked is 1000 times too small.
ah...duh. thanks for pointing that out. are there any practical uses for small inductors in pedals?
http://www.diystompboxes.com/smfforum/index.php?topic=107370.0
Quote from: ode2no1 on August 04, 2014, 02:57:26 AM
ah...duh. thanks for pointing that out. are there any practical uses for small inductors in pedals?
Such a small inductors is represents a very high impedance to radio frequencies. So you can you it to stop any radio frequency noise from entering (or exiting) in places where you don't want it. Add it in series with the power supply to help the capacitors with the filtering (or to separate the supply for a ticking LFO in a phaser/chorus from the rest of the circuit). Or in series with the input if you have a fuzz for example that's picking up radio stations.
Inductive reactance is Henries times Frequency time 6.28.
A 560 micro-Henry coil, times 20,000 Hz (extreme high audio), times 6.28 is only 70 Ohms. Closer to the guitar band, 2KHz, just 7 Ohms. This is a silly-small value for most audio circuits.
Also that coil has 12 Ohms of simple resistance, so the extra 7 Ohms of inductance hardly matters.
And it has a maximum current of 85mA (0.085A), so it won't work in 8 Ohm speaker circuits which must pass several Amps.
As you see from inpedance going up with frequency, coils make a lot more sense at HIGH frequency. There's good MHz uses for a 560uH coil. For audio we need BIG Henries, which costs a lot more than the 8 cents quoted for this part.