This came up while playing with 2 ferrite E cores bought from Paulatos shop is Kalithea. By approaching them one facing the other they make a very good contact at 3 surfaces. If one E is rotated with respect to the other the magnetic circuit changes and with it the inductance of a coil wound in the center. By a suitable pivot arrangement eg a small ball between the 2 Es a rotary variable inductor should be possible.
This may be useful for variable Pleiades (R,L) microphone filters for approaching the ideal of flat frequency response from producer's brain to listener's brain. [Lowe, Morgan]
Reference:
Sound Picture Recording and Reproducing Charactheristics - D. P. Lowe, K. F. Morgan - Journal of the Society of Motion Picture Engineers
No comments:
Post a Comment