Week 8

Title

• Order and buy some component for heart rate circuit measurement

 Objective

• To construct heart rate circuit measurement,so we need to but all the component needed

Content/procedure

• Went to Jalan Pasar and order AD524AD.AD524 need to order first at SIM supplier but other component such LM741 and NE555 timer is available at Nixie

Result/Analysis

• After deep research,AD524 AD precision instrumentation amplifier which act as preamplifier is suitable to be used in measurement of heart rate because its gain can be set to 1000 by short Pin 3 and Pin 11.

LM741- The 741 is connected as a source follower.  The output DC voltage of the AD524 is maintained to 3V.

NE555- The 555 monolithic timing circuit is a highly stable controller capable of producing accurate time delays, or oscillation. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor.

 

 Conclusion

• Circuit is developed on the breadboard
• We testing the circuit by display the result at the oscilloscope
• to power up the circuit,we used function generator first  for supply