loveguru

hi...audioguru........................ in e-scope-2 ckt u have told that tha cut-off frequency of lpf at u1b is 103 hz. now what is the frequency at hpf before u1a?/???????? we have used band-pass filter=lpf+hpf. ok? i wann the frequency responce of that.........i mean the lower limit..............please tell me fast.............. and as per my counting the freq. of heart-beats is 1.2hz.........then our hpf will be able to cut-off the 1 hz freq???????????? reply me soon. and what is the funda behind led color changing? please write in brief abt lpf and hpf operation in our circuit......... reply me soon................. bye. LOVEGURU

hi,........audioguru................ u r telling that the heartbeats freq.is 20-3- hz./................ but i counted it as 1.2 hz........... as the equation................ f=beats/seconds so..................................f=72/60................ f=1.2hz........... so..which one is true??????????????? tell me soon...i am in my clg project festival..........so i have to reply it...............ok bye. loveguru.

hi audioguru............. i have no words for your great help and supporting us.......... really thanx to you from bottom of the heart........ but still i have question ralted to ckt operation.... 1)what is the exectlly difference b/w HPF & LPF? 2)you have answered some one that without filter(c1) , circuit might be "motorboat"when the battery runs down...what does it actual mean? 3)why we have used only tl072 ope amp...why not anothers..... give me clear idea about this operatinal amplifier........ 4)ic lm386 is used for driving headphone ........has it some another function in circuit operation..........? plz reply fast as posiible as early...... loveguru...

hi.......audioguru............. tell me if i use 47 k pot instead of 10 k .then what wil happen? will i get the voice level more than that i have max. voice while using 10 k pot? i wann increse my max. output headphone volume level. what should i do? pls tell me fast....... ok bye. LOVEGURU

hi..................audioguru...................... i got my destination................ my circuit is working very well................ i can listen my heart-beat sound very well............. but........when i measure my friend's hearbts' .i can listen clearly what ever he speaks..i want to stop his word's to be stoped. what should i do? thanx for u great help............ but u have not given your identification.....,so now give it. ok........ bye. LOVEGURU.

hi audioguru and all others persons which are helping me, my circuit is working but not satisfactor.i can hear big sound(when i slightly speak to the mice) from my headphone but it is not able to catch heartbeat sound. actually till now i have tried on bread board in which connection bi default may be disconnected internally.so that now i m trying it built on pcd in which connection are done by shouldering. the connection 100% right on that can i replace 10k pot by 47k pot or not. i have sony(company) sterio mice. is it well for us? plz reply soon very very thanks for giving repling

Hi................audioguru............ i will try for taht mic. tha back-noice about which i was talkin is like:"shshshshshhhhhhhh" if we don't speak in mic.then it also created in head-phone. what should i do? Loveguru. and i want to know about you. what is your name? form which country u r? what r u? ok. bye.

HI.AUDIOGURU.......... I FORGOT TO TELL THAT WHEN I REMOVEV MY R11 POT......THEN I GOT MY OUTPUT........I DON'T KNOW IS IT CO-INCIDENTALY OR NOT? RECENTLY I HAVE NOT USED THAT POT BECOZ I THOUGHT THAT IS NOT WORKING PROPERLY. I HAVE USED ALL THREE COMPONENTS AS U ASKED IN LAST 3 Q. MY MIC. HAS ITS OWN BIASING OR NOT THAT I DON'T KNOW BUT IF I USE IT AS INPUT I CAN HEAR MY VOICE. YES.I MADE THE CONNECTION B'W MY MIC. AND STE. HEAD THROUGH THE RUBBER TUBE.BUT NOT GETTING THE DESIRED RESULT. HEY...........IF I SPEAK AT THE DISTANCE AS U TOLD-1/2 M,THEN I CAN'T GET MY OUTPUT. RECENTLY I HAVE TO SPEAK IN MIC. FROM 1/2 CM. AT 4-5 CM .ONLY LED GLOWS BUT NOT COMING ANY SOUND. PLEASE TELL ME THE WAY TO HEAR HEARBEATS. DON'T U KNOW ANY SENSITIVE MIC.TAHT CAN DETCT OUR HEART-BEATS? IF U KNOW THEN TELL ME. OK BYE. LOVEGURU.

HI...........AUDIO GURU........ I HAVE NOT CHEKED THE VOLTAGES AS U TOLD...... I HAVE USED MY WALKMAN RECORDING MIC. I HAVE MADE MY CIRCUIT RUNNING .BUT.........I CAN'T LISTEN MY HEARBEATS FROM IT........ IF I SPEAK IN MIC.I CAN LISTEN IT FROM THE EAR-PHONE........... EVEN IF WE BLOW.I MEAN DOING LIKE THUMPING AND THOMPING BY OUR SELF-THE BI-COLOR LED CHANGES IT COLOR......... BUT I CAN'T LISTEN HEART-BEATS. PLEASE TELL ME .WHAT SHOULD I DO? IF THERE ANY MIC. WHICH IS MORE SENSITIVE THEN THIS ELECTER ONE? PLEASE TELL ME ITS NAME.I HAVE TO DO IT VERY SOON. AND 1 THING IS ALSO.I WANT TO ASK THAT I HEAR SOME BACK-NOICE IN HEAD-PHONE.WHAT SHOULD I DO TO REMOVE IT? PLEASE TELL ME ABT IT................................ PLEASE REPLY ME SOON????????????? HEY I GOT AN IDEA .CAN I USE ONE AMPLIFIER BEFORE MIC.? HEY.I HAVE ALSO TRIED THAT REAL STE.'S HEAD,4 MORE SENSITIVITY BUT NOT GETTING HEAR-BEATS............ I HAVE NOT MEASERED THE VOLTAGES U TOLD BUT I WILL TELL U SOON. SO SO................. PLEASE GIVE ME ADVICE. OK. BYE. LOVEGURU.

hi audioguru, it is somewhat good news that when i connected 47 microf capa. instead of 47nf when i speak to mice(whose voice is very high compared to our heartbeat), led alternating indicating red and green light. but still i m not hearing any type of sound from my ear phone. is there any spetial type of mice there which is to be very sencitive in our case bcoz i have used simple mice? what should be the problem? plz reply fast as possible as early. thanks for help............

hi audioguru, i gone through your advice but still not getting responce. what should be the fault i cant understand. i go through each stage stape by stape everything is ok. but not getting ckt to be run. ??? only 2 days for me. i have connected 47 microf insted of 47 nf but led still glowing only in one light. u r saying that our o/p shuld be nearly zero so how can we get gain 3.8? what is your advice. plz help us

hi audioguru, i have completed the circuit of e scop- 2. but it is not working. led indicating only one light at a time. one problem created that the ic tl072 has gain 21(which i have purchesed) but it is giving arrond 70.is it fault? what shuold be actual gain? i have reconnected ckt but still it is not working? according to your advice what i have to do? so that i can make ckt working... plz reply fast bcoz i have only 5 days to complete it.

HI..............SURAJ.........THANX 4 REPLY. LOVEGURU.

HI...AUDIOGURU.... THANX 4 REPLY. LOVEGURU.

HI.AUDIOGURU.I HAVE STARTED TO MAKE E-SCOPE-2. ON MY IC ,IT IS WRITTENED"TL072CP". IS IT OK??????????? PLEASE REPLY ME SOON. AND ALSO TALL ME THE DIFF. BITWEEN THOSE 2. BYE. LOVEGURU.

HI.................AUDIOGURU. I HAVE GOT ALMOST ALL COMPONENTS. BUT WHAT WILL BE SIZE OF MY VEROBOARD? AND I WANN THE PHOTOGRATH OF YOUR WORKING MODEL. PLEASE GIVE ME THE REPLY SOON. AND I WANN THE LENGTH OF MIC'S SHIELDED CABLE? I HAVE TAKEN 1 METRE. IS IT ENOUGH? OK. BYE. LOVEGURU

hi,audioguru, thanks for reply.i got the ic TL072.But i dont no the difference between dual opamp and odinary opamp. i 've linear volume controller.you had suggested me to convert it to logarithmic by joining 3.3k resistance from slider to ground please give detailed idea about it. i have an adapter which can supply 9 v in our circuit.you have used 2 9 v batteries if i want to use my adapter then what should i do? what is varoboard?can i make this circuit on pcb? waiting for your reply, loveguru.