Quote from: J M Fahey on December 21, 2009, 07:16:09 PM
Hi audiological.
Sorry but now knowing your instrument, the piezo isn't a good idea.
It *may* pickup something, but really the didgeridoo's walls are not meant to vibrate (1 cm thick) , the main sound is not them vibrating but that of the column of air, and to boot, the piezo will be *excellent* at picking taps, scratches, your clothes, coins in your pocket or keys, even your pulse/heartbeat, *anything* that touches or scratches the instrument´s body.
As Tonyharker suggested, an electret mounted close to the end will provide excellent and faithful pickup, coupled to high output and very low impedance , not needing a preamp.
You must fashion a foam support for it to "float" parallel to the end of your instrument, about 1 cm from it.
Well, given all that has been said, I am glad I haven't purchased any materials yet.
When you say "coupled to high output and very low impedance," what do you mean exactly? Is there anyway to go about this that is better than another?
Also, does anyone have any suggestions as to where I might get the materials to build such a pickup as the electret mic? What exactly would I need and are there schematics floating around here that I might go off of?
To be honest, I am very new at making this stuff and I am very unfamiliar with the terms. So, what exactly is FET preamp?
Thanks again!
-John