I make bat detectors.
I detune the center resonance peak of the transducer by adding a bit of inductance i.e. 40khz rx transducer with 6mH coil across it increases the band width from 24 - 47 khz (-3db level) thus I can hear a wider range of "batty squeaks".
This does not work with a 25 khz transducer though.
It just seems to stop the transducer dead.
Any thoughts why this should be??
I detune the center resonance peak of the transducer by adding a bit of inductance i.e. 40khz rx transducer with 6mH coil across it increases the band width from 24 - 47 khz (-3db level) thus I can hear a wider range of "batty squeaks".
This does not work with a 25 khz transducer though.
It just seems to stop the transducer dead.
Any thoughts why this should be??