This is the second iteration with a new microphone (POM3535L-3-R), which fixed the aparent problem of frequency range and sensitivity. The design utilizes the same power supply and amplifying circuit as the first prototype using the new microphone that ranges to 16 kHZ accurately and 20 kHz with poor sensitivity.
The flaw in this iteration was that the amplifier wasnt designed for the new microphone. When the output was measured on the oscilloscope it was determined to have a gain unsuitable for the project; a higher gain is required for proper function.