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  1. Dazza

    Capicitor Help

    Hi dexterous, and welcome :D. Could this component be a "choke" have a look if you can, at the leads between the component and the PCB, are the leads enamel copper wire?  Even if the leads are not enamel copper wire, it could still be a choke.
  2. Dazza

    MOVED: Conversion of square wave to sine wave

    This topic has been moved to Electronic Projects Design/Ideas http://www.electronics-lab.com/forum/index.php?topic=3203.0
  3. Dazza

    Electronic Stethoscope

    Hi Audioguru, steven Audioguru, I have found that trial and error is the best way for me to learn electronics, I have had very little schooling and I struggle to get my head around the maths and theory :-\, in fact the only way I can write this post or any other, is with speech to text...
  4. Dazza

    Electronic Stethoscope

    Hi audioguru :), I have come up with a circuit that might help me achieve what I am wanting :D, with the electronic stethoscope. I have this idea working on the breadboard the way I want ;), and now I just need to connect them together, to see if it will work the way I want, but I'm having...
  5. Dazza

    Electronic Stethoscope

    Hi audioguru, Your just being cheeky now, pulling my leg ;D ;D, are you mistaking me with somebody that actually knows what they're doing :o. sure why not if you do the easy part "design it" and put a big red circle on the schematics around the "on switch" so I know where it is ???, then I'll...
  6. Dazza

    Electronic Stethoscope

    Hi Audioguru, I think I'd better do what I should have done before I started this project, find and read all the postings relating to this project, instead of just reading some of them ::). Ok, I think I will keep well away from the frequency upshifting idea ;D, as it seems to be well beyond...
  7. Dazza

    My girlfriend is getting into electronics

    How about trial and error ;D, Will maybe this time I will connect this overhear and that over their, and maybe this time it will work ::), Oops, that was more smoke then the last time :o, Oh, so that's why it didn't work ::), I won't do that again ;D ;D.
  8. Dazza

    Electronic Stethoscope

    Hi Audioguru :), Ahh! I was on the right track in my earlier post, so it's called frequency upshifting :), I knew exactly what it was I wanted to try to do, but I didn't know what it was called ???. So it's a difficult thing to do frequency upshifting :(, I've tried many google searches with...
  9. Dazza

    Electronic Stethoscope

    Thank you Audioguru :), you have explained very well as usual ;), how I am to go about making these changes. The quality of the sound file that I've posted didn't turn out as good as I hoped :(, I had to hold the microphone I use for my computer, next to the speaker from my digital video camera...
  10. Dazza

    Electronic Stethoscope

    And also Audioguru, we will soon be going to the hospital for another checkup, and I'm going to record the sound from their electronic stethoscope :D, I'll post the sound file to night :).
  11. Dazza

    Electronic Stethoscope

    Thanks Audioguru, that's exactly what I want to be able to do :), have as much control as possible to experiment with,  while actually using the device. Now I need to be able to do one more thing ;D, before I make these changes. Can I replace R4 with a variable resistor, will doing this allow...
  12. Dazza

    Electronic Stethoscope

    Hi audioguru, These changes are giving very good results :D, I can hear heartbeat sounds very clearly with increased volume without distortion, I changed C2 to 0.47uF as you suggested and for C3 and C4 I used to 3.3uF, unfortunately I don't have much in the way of MKT capacitors of many...
  13. Dazza

    Electronic Stethoscope

    Hi audioguru, HAY if I can't get it to work well as a stethoscope, it sure does make a great AM radio :D ;D. I connected one leg of a 0.1uF ceramic disc capacitor to pin 3 of U5, and the other leg touching my soldering iron, then I adjusted the volume control to tune into 1332AM 8).  The...
  14. Dazza

    Electronic Stethoscope

    Hi, audioguru, Alun Sorry Audioguru for sending you on a wild goose chase  :(, it seems as though my electronic stethoscope is working the way it should, and it is I that doesn't understand that it is :-[. The electronic stethoscope that they used at the hospital sounded much different, I...
  15. Dazza

    Electronic Stethoscope

    Hi Audioguru :), I've attached a sound file of exactly what I am hearing while listening to my heartbeat, while adjusting the volume control from minimum to maximum 8). As I adjust the volume control from its minimum I can just make out but barely hear my heartbeat it is very vary faint, with...
  16. Dazza

    Electronic Stethoscope

    Hi, audioguru and Thanks for your help, (1) DC voltage at the microphone    (4.80V) (2) DC voltage at pin 7 of U1B      (  03.9mV )  (3)    the DC voltage at pin 5 of U5 with the volume control turned down (4.19V) and with volume control turned fully on, it continuously changes between about...
  17. Dazza

    Electronic Stethoscope

    Thanks for your reply audioguru :), Yes, I did use a ceramic disc cap for C5. I had an idea that track placement would be important for this project, that's why I used the PCB pattern that a member posted, as I had no idea on correct track placement to design my own PCB, maybe I should give it...
  18. Dazza

    Electronic Stethoscope

    Hi, I've completed this project, electronic Stethoscope 2 :).  Either I'm expecting too much from this project :(, or more than likely I've made an error some where :-\. I can hear a "very vary" faint but clear heartbeat, when I adjust the 10K LOG potentiometer to around its minimum, say less...
  19. Dazza

    Schematics Variable current 12v 60A to 0A

    Hi, MEHTAB AHMED :D A lot of my work on this project is in the form of drawings, reactor chamber, high and low pressure chambers, filtering system, hi pressure pumps etc. Are you wanting to take on this project? ;)
  20. Dazza

    4W FM Transmitter

    Nice work Sasi 8), and all those pic's showing exactly how to make it :D, now anyone wanting to contact aliens can build your groundplane antenna ;D ;D.
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