Affordable Bimodal Optical Sensors to Spread the Use of Automated Insect Monitoring

Figure 15

Demodulator. The signal from the sensor reaches the band-pass filter IC14 and IC15 through the connector CON2. The filters have a bandwidth of 30 KHz and reject signals outside 455 ΚHz. The outputs of the filters drive the demodulators IC12 and IC13. The output of each demodulator is an audio signal that includes the 455 KHz frequency and is filtered by a low-pass filter.