gregtorres
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Posts posted by gregtorres
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The timer circuit is a counter. It counts seconds. It is easy to change it to count hearttbeats.
Heartbeat Monitor parts list? -
Hi Greg,
I am glad that your project works well. ;D
It uses unregulated 9V supplies which will be fine for a Cmos counter circuit. A TTL counter circuit would need a 5V low dropout regulator and a few other parts.
The AC signal from the output of U4 could feed through a 10k resistor into 1/6th of a Cmos Schmiitt-trigger inverter to convert the AC into clean pulses then a second inverter could be used for you to select the best pulse polarity for the counter.
We have a 99 seconds timer project that has a Cmos counter:
http://www.electronics-lab.com/projects/oscillators_timers/014/index.html .
Its clock can be the heartbeats and you would need to make your own timebase gating for it.
There is a heartbeat display project on the web that used a microcontroller for its counter:
http://www.web-ee.com/Schematics/HeMon/HeMon.htm .
Thank you so much Sir! those things could really come in handy! but i dont really need a timer circuit, i just need a heart beat counter display. http://www.web-ee.com/Schematics/HeMon/HeMon.htm :) i'll post a reply as soon as i have improvements. -
I'm finished working the ELECTRONIC STEThoSCOPE 2 project and its working just fine. now all i need to do now is to put or connect a 7 Segment LED heart beat Counter circuit display to count in heart beats. but can i put or connect a 7 Segment LED Counter circuit to the ELECTRONIC STEThoSCOPE 2 even without changing the original circuit config. of the ELECTRONIC STEThoSCOPE 2? and is there a 7 Segment LED heart beat Counter circuit display project posted in the forums?
Please help!
any replies regarding to this topic will be highly appriciated! Thank you! -
I'm finished working the ELECTRONIC STEThoSCOPE 2 project and its working just fine. now all i need to do now is to put or connect a 7 Segment LED heart beat Counter circuit display to count in heart beats. but can i put or connect a 7 Segment LED Counter circuit to the ELECTRONIC STEThoSCOPE 2 even without changing the original circuit config. of the ELECTRONIC STEThoSCOPE 2? and is there a 7 Segment LED heart beat Counter circuit display project posted in the forums?
Please help!
any replies regarding to this topic will be highly appriciated! Thank you! -
I'm finished working the ELECTRONIC STEThoSCOPE 2 project and its working just fine. now all i need to do now is to put or connect a 7 Segment LED heart beat Counter circuit display to count in heart beats. but can i put or connect a 7 Segment LED Counter circuit to the ELECTRONIC STEThoSCOPE 2 even without changing the original circuit config. of the ELECTRONIC STEThoSCOPE 2? and is there a 7 Segment LED heart beat Counter circuit display project posted in the forums?
Please help!
any replies regarding to this topic will be highly appriciated! Thank you!
Electronic Stethoscope 2
in Projects Q/A
Posted
i can seem to find this 0.047uF/50V Metalized plastic-film Capacitor, i think its not available here in manila philippines... is mylar capacitor ok to replace this?