xoy

HI AGAIN AUDIOGURU!!!!! THANKS!!!!!!!!!!!!!!!!!!! ---XOY----

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 HAVE TO CHANGE IT ALSO TO HAVE A Vcc INPUT OF 9V?? ??? DOES THE RESISTORS NEEDED IN THE COUNTER IS ENOUGH? ??? IF I WOULD CHANGE THOSE IC's, DOES THEIR PIN CONFIGURATION ARE JUST THE SAME TO BEFORE?? ??? THANKS!!!!! ------XOY------- ;D ;D

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 the kind of capacitors (C3 nad C4) used in the filter is an adjustable.. but it wasn't... is there anything to use which is an adjustable? Maraming salamat po talaga!!!!!!! (I'm very thankful to you!!!!) ----xoy------

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 appreciated... tnxx!!!!! ___xoy____

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

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 timed switch... i have my circuit to be.. but i can't upload it here using the bmp or paint.. thank you so much!!! ----xoy----

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, but if you have one circuit of it , please post. sorry,, but i dont iunderstand about that 6 seconds timer... tnx!!!! -------xoy-------

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 LED display. i also want to put a 60-seconds timed switch at the entrance of the pulse counter. this means it will stop the counting after 60-seconds to get the accurate heart rate. next time i will attached my circuit. i dont knw how to edit the pic, coz were using redhat instead of microsoft word. thankss... hope you can put attention on this.... any reaction are highly appreciated..... ----xoy------

anyone please!!!!!! schematic diagram of any digital or electronic

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

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