For the moment, I think a TL072/TL074 will do just fine, I'm a little
afraid of it's noiselevel though.
Besides, going for a NE5532 will make the batteries last much less.
Regards
PAF
Hi PowerAmpFreak, I have been thinking, and it is so many years ago I had
a guitar with electric pickup coils, and those were inductive.
So if the 'sensor' is like this:
-R-L--------
|
------------
where R is the resistance of the windings, why not drive into a LOW impedance:
+9V
|
[ ] 10k
470k |-----------------0
--===---| c
| b |/
---||-----------|
|\/ e
-- |
| |
/// ///
The idea is, that as freq goes higher, the impedance of the picup coil _also_
increases, so the Ib is actually set by the R in the coil in series with the Zi
of the transistor circuit.
There are several advantages in using a low impedance circuit, no effect of cable
capacitance, low noise if input open, linear freq ??? response?
(I am not sure if lower frequency snares make the same EMF..., but seems sensible).
Also, with the correct wrong bias this cicuit will give the so much loved correction
of the waveform, sometimes by some non musicians bluntly referred to as 'distortion'.
This aside, in the old vidicon (camera picture tube) days, great effort was made to make
a high impedance input amplifier, one day I just stuck the signal in a cicuit as above,
and it worked just as well.. (vidicons have many MOhms output impedance, makes it pretty
much a current source, ideal to drive a base of a transistor, if impedance is high enough
then no distortion.
Anyways I have no guitar now, so I cannot test it, maybe somebody can?