Week 8 (FYP 2)

                 For this Week, I try to construct the circuit of the amplifier to connect to the Arduino circuit and view the result using the oscilloscope. When I test the circuit using Op-Amp OPA 344 I get the result what I want but it's have some noise on the waveform of output result. The figure below show the output waveform get from the amplify signal from the Op-Amp OPA 344. The final circuit is the best circuit when the gain is higher enough to increasing the input signal to the output at the end of the circuit.

Figure 1: Testing circuit viewing on Oscilloscope 

                 The output waveform display on output waveform below shows the signal was amplify by the operational amplifier (OPA 334) received heart beat sound from the microphone or when output equal to '1'. The point (A) shows the signal when sensor detected the sound of heart beat and point (B) shows the no sound detected by the sensor or when output equal to '0'  but it have a some noise from the surrounding because of it have a little bit waveform from there. Then, the second figure below shows the waveform when output is received the LED on the circuit also become to turn ON.

Figure 2 : Output waveform

Figure 3: Digital Output (LED turn on)