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  1. Emad1

    Electronic Stethoscope

    Hi all Ihave made the original ,the corrected and the elect. steth. 2 about one year ago The original didn t work and the other two worked. The  best one was the corrected circuit. The stethoscope should hear the sounds between the 1st and 2nd , and the 2nd and 1st heart sonds , like murmours...
  2. Emad1

    Electronic Stethoscope 2

    Hi all I made these circuits many times without the part involving the bipolar diod and they were operating. About three times they suddenly become badly operating.they respond to knocking on the diaphragm of the stethoscope but not to the heart sound.I dont knoww the cause. I hope you give me...
  3. Emad1

    Electronic Stethoscope 2

    Hi audioguru many thaaaaanx Realy I dont know how to thank u. Forgive me my english is so bad to do that
  4. Emad1

    Electronic Stethoscope 2

    Hi Audioguru sorry for being back so late I want to ask about modifing a circut working on 3 volt and used as an hearing aid as a stethoscope?? this circuit is present in this site http://www.electronicsforu.com/EFYLinux/circuit/aug2003/CI-2-hearing-aid.pdf Shoud it do well if a filter circuit...
  5. Emad1

    Electronic Stethoscope 2

    Hi Audioguru If I want to use the 220 volt supply for the stethoscope,what rectifier circuit could be used . I hpe you post it. Is there any modification in C7 and C8?????
  6. Emad1

    Electronic Stethoscope 2

    Hi Audioguru Ihad reversed the variable R and had controle on volume . The sound is good in about 1/4 the range of the volume controle or less ,then there is mutch distortion. By putting 1k risistor paralell to R4 the noise disappear but heart sound become weak and respiratory sounds are not...
  7. Emad1

    Electronic Stethoscope 2

    Hi Audioguru. I built this circuit with the TLO72. There is mutch noise. When lowering the volume there is a sound like hissssssss ,then after slight raising of volume heart sound is very laod and there is nearly no effect of increasing the volume . My mic cable is about 2 meter long but it...
  8. Emad1

    Electronic parasite zappers

    Hi Steven These circuits use propes that shold be connected to the body. Is there acircuit producing pain relief without contact to the body??? Many thanx
  9. Emad1

    circuit for pain relief

    Thank you Steven
  10. Emad1

    circuit for pain relief

    Have anyone heared about a circuit that relieves pain ??? If there is a circuit like this pls tell me . THANX ALOT.
  11. Emad1

    Electronic Stethoscope 2

    Thank you Audioguru. I ll try 4.7nf tomorrow
  12. Emad1

    Electronic Stethoscope 2

    I tried 20 nf for the two and then100 but the heart sound became very fiant in the both attempts. The circuit is good with its original capacitors. I had put a link to your project in an arabic electronic forum. I dont know shold I have been first taken a permission from you or not ???/ If so I...
  13. Emad1

    Electronic Stethoscope 2

    Hi Audioguru You knoe I built what is called the corrected circuit using 2 TLO71 and LM386. It works well. Is the E.Stethoscope 2 the same. ?? Have you built it?? Which battery is connected directly to the LM386??That one connected to 470 uf or that connected to 1000uf. I wonna tell u that the...
  14. Emad1

    Electronic Stethoscope 2

    Hi Audioguru I built the circuit named auto stethoscope. It works but your circuit is mutch better . I want to ask about C7 and C8. You said 1000uf for C7 and 100uf f or C8 I noticed that one battery became very week. What is the cuase??? Also could some components be changed to make the...
  15. Emad1

    Electronic Stethoscope 2

    Audioguru. Thank u again . I wonna tell u that I built the circuit without the IC which is connected to the bipolar diode.I wanted to decrease the size of the board and also the mistakes.
  16. Emad1

    Electronic Stethoscope 2

    Hi Adioguru. I constructed your corrected circuit. It is more than excellant .No distortion , minimal noise and the sound is the same like a real stethoscpe. I can hear my heart beats and respiratory sounds laod and clear from above clothes . I dont know how can I thank you fore helping me ...
  17. Emad1

    Electronic Stethoscope 2

    hi Audioguru. I consrtucted the circuit with the TLO72 on a test board but there is just noise and nothing from the mic goes to the earphones. What is your opanion about this circuit in the site I put here , and can I use TLO72 insteed of NE5532 ?????
  18. Emad1

    Electronic Stethoscope 2

    Audaguru. I wonna ask about the function of U4 which is connected to the bipolar diod in this circuit . Can I make the circuit without it???????I think it produces flickering sound as light???
  19. Emad1

    Electronic Stethoscope 2

    Hi Audaguru. I sent for the TL072 but I dont know it will be present or not. I told u before that I connected the output of the LM358 to the input of the LM386 using just two ICs and I have a satesfactory result. I removed some noise by adding 0.1uf between the variable R of U2 and the negative...
  20. Emad1

    Electronic Stethoscope 2

    this is the preamplifier I used-----R1 R3 R4=10K----R2+1K--R5=100K to 1M-----C1=0.1uf ---C24.7uf
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