As a lab assignment I have been asked to s to build a heart rate monitor which has 5 key components: • A detector or transducer: This measures the pressure pulse in your finger and converts it to the electrical signal in synchronism with the PQRST wave. • Signal Conditioning: Processes the “raw” signal from the transducer and extracts the important signal components. • An amplifier: This takes the processed signal and amplifies (increases) its level to make it easier to use. • A comparator: This converts each signal from a heart beat into what is called a digital pulse. A digital pulse is a simple square shaped signal, which is easy to count. • A digital counter: The digital pulses are fed into a circuit which counts the number of pulses received within a minute, and displays the count. It also has a signal provided by the optical sensor which is too small in amplitude to be of any practical use in the heart rate monitor and therefore requires to be amplified. I construct detector amplifier and then Connected the 5 volt power supply to the work station and monitor both the input and output signals of the amplifier by connecting the oscilloscope to the appropriate monitoring points. To obtain an input signal, I placed thumb on the light dependent resistor surface and observed the signals using the oscilloscope. I got 3 measurements by adjusting the variable resistor to change the gain of the amplifier. I got 3 different signal peak-to-peak voltages and assicated amplifier gain which are as following: 26.47 mV, 10.6 mV and 23. 82 mV (These are the already calculated ratio Amplifier Gain). Can you help me to comment on the observed experimental amplifier gains and the frequency dependent gain anticipated from theory?
As a lab assignment I have been asked to s to build a heart rate monitor which has 5 key components:
• A detector or transducer: This measures the pressure pulse in your finger and converts it to the electrical signal in synchronism with the PQRST wave.
• Signal Conditioning: Processes the “raw” signal from the transducer and extracts the important signal components.
• An amplifier: This takes the processed signal and amplifies (increases) its level to make it easier to use. • A comparator: This converts each signal from a heart beat into what is called a digital pulse. A digital pulse is a simple square shaped signal, which is easy to count.
• A digital counter: The digital pulses are fed into a circuit which counts the number of pulses received within a minute, and displays the count.
It also has a signal provided by the optical sensor which is too small in amplitude to be of any practical use in the heart rate monitor and therefore requires to be amplified. I construct detector amplifier and then Connected the 5 volt power supply to the work station and monitor both the input and output signals of the amplifier by connecting the oscilloscope to the appropriate monitoring points. To obtain an input signal, I placed thumb on the light dependent resistor surface and observed the signals using the oscilloscope. I got 3 measurements by adjusting the variable resistor to change the gain of the amplifier. I got 3 different signal peak-to-peak voltages and assicated amplifier gain which are as following: 26.47 mV, 10.6 mV and 23. 82 mV (These are the already calculated ratio Amplifier Gain).
Can you help me to comment on the observed experimental amplifier gains and the frequency dependent gain anticipated from theory?
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