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Emad

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Everything posted by Emad

  1. Hi all . I constructed the corrected circuit and I have good amplification when I make clicks with my tongue.,but heart sounds are distorted . there are many cracles and crepitaions with the soundto the extent that no heart sond could be heared when increasing the volume. I used anon shielded wire with the mic and I forgot C7 and C8. Also I put R9 as it is and making short at it does not make a differance. Thats what I did--------------------------------------Thank youuuuuuuuuuuuuuuu
  2. MP thank you . Iknow you are right but because I need this circuit Ill try the corrected schematic.I hope it works well.I hpe i have another circuit for the same reason,so if you have another stethoscope circuit diagram plz tell me.Thank you again
  3. thank you audiguru and moderator--------I shall make the corrected circuit from the bigining. it is more simple.I hope it functions will
  4. i have put 2.2k variable risistance instead of the 2.5k variable R simply because i did not find the 2.5k-------I made clicks with my tongue near the mike and i hear it as sharp clicks,so Ithought the circuit is good but it wasnt--------- sounds other than the clicks are not heared-----------Idont know if i made a mistake in the circuit or not as i am a doctor and i make circuits as it is -------------------except for clicks the sound is distorted ------i put the mike in the cone of an old stethoscope but i heared nothing-----I am sorry for giving false impression about the effectiveness of the circuit but I thought it good before trying the cone. Iused mobile headphone. I dont know its impedence. THANX ALOT
  5. yes ,I mean the original schematic-----thank you
  6. Hi--I made the 1st schematic ----it acts well------- i put the pin 4 of U5 to negative voltage ,also i put 2 light diodes in opposite instead of the bipolar diod as i did not find it ------and a variable resistance of 2.2k ------the circuit is working fine -----now I just need a cone to compare it to the real one------thank you for advice
  7. [first thank u for the circuit and the forum-----i am a physition and just do circuits as it is---so forgive me for my silly qwustians and my bad languitch as i am egyptian--- i ask about connecting the common earth and the negative volt----- are they connected together??? and if not how can i connect the battery??????thanx alot
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