2B-HEART BEAT COUNTER
It is a Novel project in the Medical Electronic world. With the help of this project counting of Heart Beat is displayed on FND Display for 1/2 a minute. Counting display figure can be continued by the use of Reset switch. By pressing Reset switch on counter board display is continued. By Pressing Reset switch counter Board display counting figure can be brought to “00”.
TECHNICAL DESCRIPTION AND WORKING
This project has been developed and tested O.K. in our TV Engineers Technical Lab. The components and PCB used in the projects published in our books are available for sale at resonable price.
It is a Top project in Electronic field , and very useful for the common man. Specially it is boon for the people suffering from breathing trouble. Two 555 IC have been used in this project as a Timer. The period is set for 1/2 minute which can be increased. When timer IC no 1 is put on, then second Timer starts working. Its working system is very simple. We have used one Piezo Element which sense the beating sound of the heart when kept close to the heart. Signal received through it is amplified by the transistor BC 148. Output received on the collecter of BC148 is given to the amplifier circuit made of IC 810 (on the amplifier board) Output of this amplifier is connected to the headphone and simultaneously output is given to Timer IC No.2. Analog Input received on Pin No.2 is converted into Digital output and received on Pin No 3.
PRECAUTIONS WHILE ASSEMBLING THE PROJECT :-
Take care of the polarity of Piezo Element. Wrong polarity will not give any output.
While soldering Transister check the collecter , base, emitter with Multimeter.
Take care of the polarity of the condenser connected to the Pin No 6 of IC 555.
While soldering Diode take care of anode and Cathode of the Diode.
Do not solder IC directly on the PCB.
There is possibility of parts getting spoiled due to leakage current from the soldering Iron.
LIST OF COMPONENT
PCB [Code 5TP09]=1
820K=1, 22K=2, 10K =1, 1K =1, 1 MEG Tone =1, 220K Tone=1
4.7mfd/16V=3, 220mfd/16V=2, 470mfd/16V=1, 0.01pf=2
IC555=2, IC Base [8Pin] =2, Piezo [Heart Beat Receiver] =1, Head Phone Speaker =1, Pre-Assembled 810 Amplifier Board =1
Pre-Assembled Counter [FND] =1, Push To On Switch =2, Push To Off Switch =1