Question

AC Plugpack 12 VAC RMS Amplifier and Filter To PC 10 mV magnitude magnitude Microphone

A Biologist needs your help to build an amplifier and filter to take small signals from his bird sensing microphones and amplify them so that he can capture the signals on his PC. The microphone produces AC signals at varying frequencies with 10 mV magnitude. His PC requires the signals to be 1 V magnitude. The signals that Barry is interested in are above 1 kHz Hz. He would like the filter to attenuate signals at frequencies below 1 kHz. The amplifier and filter circuit is to be powered from an AC plugpack. The AC plugpack provides 12 VAC RMS at 50 Hz.

Question:

Design the amplifier and filter circuit to meet Barry’s requirements. The circuit must produce the required gain, and also attenuate the signals below 1 kHz. Show calculations for the selection of components where practical. Show a circuit diagram for the complete amplifier and filter circuit.

Answer 1

Answer 2

solution:

| 0 comparing © ¢ B, in phase circuit i the complexe power Transferred is more than what calculated in sequence network. Solution : @ 70 design power suupply component of amplifica and File NCC (GND Nt Ground A Vcc ② circuit is given as, tpf.c Ampliftee Vino Tovo Gain no-99 fc = 1 kHz we know c = atfer

» RCIT FC1000) 21(1000) er aTTC1000) >R RC = 1.6X169 Pass band gain of an amplifier - A= H R S. RI=Ra] FA=1+1=2 For high pass filter Gain A (Alpe) In . 1000 J14648734 1+(100/100 20.2 " In dB; an--2o1ogle. - = -13.97 . Adba-ludb © At given frequency Response es Given as I Frequency | voltage gain t Gainda) 0:2 LOO 1000 liu -14 3.01 5.98 10,000 1.99

@ Response plot Gain (dB) A voltage gain of 1000 4000 6000 8000 10000 12000

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