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| Alternative Energy Discussion relating to the design and implementation of alternate energies. |
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Thread Tools | Display Modes |
7th February 2008, 02:03 PM
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New Member
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simple heartbeat monitor!!!
ok i hav given dis project on which i have to built a simple heartbeat monitor with three components..battery resistor and electret....it says, these three components in series makes a heartbeat monitor..but i m not sure...
need help on it!!! tnxxx KK |
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7th February 2008, 02:11 PM
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Experienced Member
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Stick the battery into the heart, if it bobbles about then it's working.
Mike. P.S. A bit more info would be useful. |
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7th February 2008, 02:15 PM
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New Member
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lol ahaha i tried it...
well its juss a simple heartbeat monitor..abt the signals..we hav to use oscilloscope to demonstrate... so basically i need a circuit diagram of heartbeat monitor with these three components...i duno if dis helps... |
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7th February 2008, 02:27 PM
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Experienced Member
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What is an electret?
Mike. |
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7th February 2008, 02:30 PM
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New Member
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electret microphone..
n eyy tnx fo responding |
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7th February 2008, 02:49 PM
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Experienced Member
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I would guess that wiring the battery, microphone, resistor and some monitoring device in series would work. Do you have access to an oscilloscope?
Mike. |
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7th February 2008, 03:18 PM
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Experienced Member
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Simple acoustic pickup with a basic electret microphone circuit. Lots of background noise, but should give a visible pulse on your scope.
Ken Sorry about the spelling of "oscolliscope".
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"To invent, you need a good imagination and a pile of junk." Thomas A. Edison (1847 - 1931) |
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7th February 2008, 03:29 PM
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Experienced Member
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Good find Ken.
Mike. |
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7th February 2008, 03:34 PM
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Experienced Member
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Good find?
 I "designed" that one!Ken 
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"To invent, you need a good imagination and a pile of junk." Thomas A. Edison (1847 - 1931) |
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7th February 2008, 03:46 PM
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Experienced Member
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Sorry.
I assumed you found it. Mike. |
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7th February 2008, 05:14 PM
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Experienced Member
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Pommie,
Only kidding. Though I drew it up, I've seen the basic electret mic circuit many, many times, so it's hardly "my" design. kenybio's parts list just fell into place. Only thing he was not given was the usual DC-blocking capacitor on the output, so I threw in the AC-Coupling on the o'scope. Ken
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"To invent, you need a good imagination and a pile of junk." Thomas A. Edison (1847 - 1931) |
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20th February 2008, 04:13 PM
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New Member
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guyss am here afta long time by now..i read all ur posts towards it and dey r really help full..who ever said abt capacitor..yes to avoid noise from body u can use that...so KEN...the circuit u gave me shloud work now..i will try it butt i just wanna ask one question..That electret mic u put in the circuit...do u know any specified electret or i can use ny of it..i m askin dis coz dis is my firsttime working wid an electret so yea....and YES i m allowed to use oscilloscope...so thats not a problem...
Tnk u guys again... hardly appriciate... |
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20th February 2008, 04:17 PM
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New Member
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one more question...to block DC coupling...i hav 2 put a capacitor...but where shld i put that??..in series wid that resistor in ur atteched circuit???? can pllzz re draw it with capacitor??
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20th February 2008, 05:42 PM
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Experienced Member
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kenybio,
The capacitor (C1) is add in the attached schematic. I didn't put in a value for it...you'll have to try different values and see how they affect the output signal. If you use electrolytic capacitors, the (+) goes toward the mic. For a bit of mechanical amplification, you can make your own stethoscope head for the mic. Ken
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"To invent, you need a good imagination and a pile of junk." Thomas A. Edison (1847 - 1931) |
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20th February 2008, 06:54 PM
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New Member
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ohh well tats reali helpfull..well i will try sooner n let u know if it works or not!!!!...
nywayz tnxx again!! |
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