Sound-controlled sensor HTD278-1, chick female / male identification circuit

The following figure is a chick female / male identification circuit composed of a sound control sensor HTD278-1. It is based on the frequency of 5 160 to 5 240 Hz (with the heart frequency of 5 200h), and the frequency of the male chicken is 4 760 ~ 4 840Hz: (center frequency is 4 800 Hz) to identify 3 Elder chicks in the month. 1. Circuit composition The above figure is mainly composed of an operational amplifier IC1 and a sound control sensor HTD278-1. This is a negative feedback dual T asymmetric circuit. The circuit has the characteristics of good stability, high quality factor, convenient adjustment. 2. Principle The piezoelectric crystal HTD sensor converts the received chick sound signal into an electrical signal, which is added to the 2 foot of IC1 by Ri, C2. The RC active bandpass filter consisting of IC1 will filter the input signal, remove the frequency, amplify the required frequency, the signal outputs from the 6 foot of IC1, coupling by C3, limited stream resistance R7 plus LED1 Positive pole. If the signal output of the IC1 outputs the LED1 light emitting diode, the hen is detected. If the 6 foot output of IC1 makes LED1 do not illuminate, the cock is detected. hint: The circuit shown below will be put into use as long as the data is selected in accordance with the data provided in the figure. Since the power consumption is small, it can be powered by a dry battery of 4.5V, and SA1 is a power switch. Read more

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