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  1. xoy

    digital elec-stetho..

    hi audioguru!! tnx.... 1.) you have told me before (page 13, reply #170 and #172) to add another Ub1 stage to detect only the exact heartbeat pulses... so maybe the problem about the numerous pulses is out... 2)  i have here again the circuit... i add the schmitt trigger that turns the analog...
  2. xoy

    Electronic Stethoscope

    add..
  3. xoy

    Electronic Stethoscope

    hi again audioguru!!! i know what you suggested to me seems really reliable and very useful... but a kind of person like me, cant really fully understand it.. specially those latching and other terms, which i was not familiar.. i again presented another circuit here.. please post corrections...
  4. xoy

    Electronic Stethoscope

    hi audioguru!!! i have the circuit here... this is my idea of circuit, so why im trying to use the relay... and the timer too... tnx!!! -----XOY-----
  5. xoy

    different kind of hard-to-find switch

    hi!!!! is there any switch which a normally open and power switch are combined in one switch, specially a push button??? any reaction regarding to this are highly appreciated.. thanks in advance!!!! -------xoy----
  6. xoy

    Electronic Stethoscope

    HI AGAIN AUDIOGURU!!!!! THANKS!!!!!!!!!!!!!!!!!!! ---XOY----
  7. xoy

    Electronic Stethoscope

    WOW THANKS AGAIN AUDIOGURU!!!! YOU HAVE TOLD ME BEFORE TO CHANGE MY 74LS90 TTL BCD COUNTER AND 74LS47 TTL SEVN SEGMENT DISPLAY DRIVER OF MY COUNTER,  TO A Cmos dual BCD counter CD4518 AND Cmos 7-segment display drivers WHICH ARE CD4511 or CD4543. BUT HOW ABOUT THE 7-SEGMENT LED DISPLAY?? DO I...
  8. xoy

    Electronic Stethoscope

    hi audioguru!! tnx!! for the help.... but at as usual... pls help me again... i cant find bi-color LED that has only two leads, what i only see is an LED which has 3 leads, it seems its not available here in manila, philippines. is there any replacement for IC TL072? i have thought that...
  9. xoy

    A timer question

    hi anyone!!! can someone help me pls... my problem is this.. i want to time a counter, so that it will automaticlly switch-off after one minute or 60 seconds. will you pls give me simple schematic or circuit digram of 60 seconds timed switch-off. any reaction regarding to this are highly...
  10. xoy

    Electronic Stethoscope

    hi audioguru!!! long time no hear!!! hehe... :D :D i just want to ask if the counter in (http://www.aaroncake.net/circuits/counter.htm), would be compatible to the electronic stethoscope2 when tapped to the bi-color LED. tnx!!! have a good day!!!! ---------xoy------ ;D ;D
  11. xoy

    Electronic Stethoscope

    tnx audioguru!!!! now i can start this.... i will notify you anytime for any improvements, problems, or anything... i will use a an IC voltage regulator having an output of 5V. wait.. i dont know how to trigger a switch using a timer to switch off the entrance input of the counter. i mean a...
  12. xoy

    Electronic Stethoscope

    hi audioguru!! tnx!! maybe thats a good idea.. first, i have to ask.. does my idea really possible to make this digital? does it mean i have to put another U1b stage. where should i place it? another prolblem i have encounterd here is, the timer. for now i want to buy a kit of switch timer...
  13. xoy

    Electronic Stethoscope

    hi audioguru!!!!! can you help me please improve this electronic stethoscope. i just want to make this elec-stetho to make it digital... i want to connect a pulse counter on the bi-color LED, so that it will count the blinks of one LED. the counter will diplay the counted pulse on an 7-segment...
  14. xoy

    sphygmomanomater.

    anyone please!!!!!! schematic diagram of any digital or electronic
  15. xoy

    Electronic Stethoscope 2

    hi!!!!! Thanks for the pics you posted. Actually, i didn't see it here. But thanks anyway. --XOY
  16. xoy

    Electronic Stethoscope 2

    hi AUDIOGURU!!!!!!!!!!!!!!!!! MAY I PLEASE HAVE THE PICS OF THE CONSTRUCTED "ELCTRONIC STETHOSCOPE 2 ". THANKS!!!!!!!!!!!!!!!!!!!!11
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