fyp_ week 4 : The results

this is captured the uotput sound and waveform of hearbeat from the circuit. as instructed by supervisor. we use the Thinklab Phonocardiography software to capture the output signal.

fyp_week 3 : Buying and building

these are component that bought from Nixie Electronics in Jalan Pasar, KL

we bought 2 set of these component and it just cost me about RM15. They are quite cheap.

 

this circuit is working and can be detect haertbeats.

 it is better to use piezo than mic because piezo detect vibration and mic detect noise in the air. we will upload the output result of my circuit in my next entry.

fyp_week 2 : The circuit diagram

this is the circuit diagram. we use to build final year project. 

the components are :

- LM386 Low Voltage Audio Power Amplifier

- MPF102 Transistor

- 1K Ohm 1/4-Watt Carbon Film Resistor

- 1M Ohm 1/4-Watt Carbon Film Resistor

- 10 Ohm 1/4W 5%  Carbon Film Resistor

- 4.7K Ohm 1/4-Watt Carbon Film Resistor

- (x2) 0.047µF 50V Capacitor

- 220µF 35V 20% Radial-lead Electrolytic capacitor

- 100µF 35V 20% Radial-lead Electrolytic capacitor\

- 0.1µF 50V Hi-Q Ceramic Disc Capacitor

- 10K Ohm Linear-Taper Potentionmeter

- 1/8” Mono Panel-Mount Audio Jack

- Earphone/Headphone

- 9V Battery Snap Connectors

- 9 Volt Battery

- 90dB Piezo Pulse

function the component:

 LM386 Low Voltage Audio Power Amplifier
~The Contek LM386 is a power amplifier, designed for
use in low voltage consumer applications. The gain is
internally set to 20 keep the external part count low,
but the additional of external resistor and capacitor
between pin 1 and pin 8 will increase the gain to any
value up to 200.

 

MPF102 Transistor
 ~This device is designed for electronic switching applications such as
low ON resistance analog switching.
~ Sourced from process 50