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Member Since: 03/31/02
09/17/08 1:27 PM
09/17/08 5:01 PM
09/18/08 12:20 PM
09/18/08 4:07 PM
09/18/08 4:50 PM
09/22/08 4:11 AM
09/22/08 12:45 PM
10/16/08 6:12 PM
10/16/08 11:41 PM
It is true that if you modeled pickups with more winds AND were imagining the guitar's volume was starting to get turned down that you'd get
attenuation in the trebles
and you can get back to a flat response by shorting the dummy coil with a capacitor
But if you use a "wrong" value for the capacitor, you can get a weird result, like a notch filter.
I tried doing the math for those circuits analytically tonight, but it almost killed a TI89 emulator, and then it looked like the result might not pass the
"unit analysis" test, so I might have made a mistake somewhere.
10/17/08 11:59 AM
Might not be so good for a guitar with a low B = 62 hz, but maybe it could be worth checking for a normal six string.
10/17/08 5:06 PM
06/02/09 8:28 AM
08/11/09 3:39 PM
08/11/09 7:25 PM
08/13/09 7:39 PM
I probably should re-do the two peak circuit with resistive inductors.
11/11/09 3:51 PM
01/14/10 7:28 PM
01/19/10 2:04 PM
01/23/10 11:26 PM
01/26/10 11:48 AM
Anyway, it's also possible to analyse the Wien bridge oscillator like I
did the filters earlier, by considering capacitors to be generalized
by considering the part of the circuit below the output to be a filter.
But at the end you need to find both the gain and the phase shift. The
condition is for a phase shift of zero degrees (so what the amplifier
adds back, without inversion, is in phase with what you start with --
the op amp itself
has no phase shift because there are only resistors). Then you find
that the filter gain is 1/3, so the op amp gain needs to be 3 (=1 + y/x
-> y/x = 2) for
stability. I can post the math later.
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