Recent content by hakyman

  1. hakyman

    +/- reg

    hi everybody , me and my friend have designed( actually changed smth on a schematic:) a reg for non simetric transformer the point is the transformer connections. its workin ok now, but i dont have a chance to measure or see all effects on output, is that kind of connections has a disadvantage ...
  2. hakyman

    CA3237

    Hi Hotwaterwizard thanks for the reply i have the datasheet but i'm searching for a replacement cause it cant be found at electronics shops at around. thanks best regards
  3. hakyman

    CA3237

    Hi i need to learn if there is a replacement or similar part to CA3237(IR preamp). cause i cant find it around thanx best regards
  4. hakyman

    sound Card mic input standart

    hi Audioguru i did not do special cahnges on filter block still sallen n key type but i just set the cut-of to 1500Hz coz i said before i work on both heart and respitory sounds and respitory sounds range is 70-1200 hz. i added a digital filter at 8th degree to choose the heart sounds. i know...
  5. hakyman

    sound Card mic input standart

    hi Audioguru Here is my measurements(all values r max, means i hit the stethoscope head as strong as i could do ;D ) output of steth. circuit; ACV =1.5V (with no load) DCV =+/-1.5V(with no load) ACA =12mA (with no load) resistance in ohm of PC sound car dmic input=unreadble(over 20Mohm) when...
  6. hakyman

    sound Card mic input standart

    hi Audioguru i'm not powering the mic from sound card. i use the sound card as a receiver for PC like the Rf TX circuits connected to the PC. actually its again about the ur electronic stethescope project. i wrote a parallel port and  sound card program to monitorising the sound and added a...
  7. hakyman

    sound Card mic input standart

    hi everybody i'am searching for a standart for sound cards but i cant find smth about it. i read much tittles about it but there is no standart  i could find. is there a standart for sound cards for Acceptable voltage to mic input?????? or what is the worst sound cards max aceepptable voltage...
  8. hakyman

    Electronic Stethoscope

    hi guys thanx for the replies audioguru could pls make it some clear  cause i dont see ever a mouse kit with rf i only use IR kits. and do u know a link have some schematics without a needage of antenna of transmitter. u can write to the link to alun gave at  above where u discuss about...
  9. hakyman

    Electronic Stethoscope

    hi  Audioguru !!!!! how r u ?for a long time later i come back :) i finished the circuit and the matlab program to analyse the heart and respitory sounds.thank god :) anyway now i want to add a trnasmitter and receiver circuit because the cables really annoying hehe anyway what u suggest? i am...
  10. hakyman

    3E 1001 D phototransistor

    hey guys ; i have got a little problem here , i bought a phototransistor but i cant find the datasheet . the only thing writed on the device is ; 3E 1001 D , i ahve searched in net and datasheets but i cant find something. i think the numbers are explanation numbers its a 3 pin phototransistor...
  11. hakyman

    Electronic Stethoscope 2

    thanks for the advice
  12. hakyman

    Fun Card Programmer

    hey what is it i dont know what is afun card ? could anyone explain that what is used for ? thanx and sorry for ignorance:)
  13. hakyman

    Electronic Stethoscope 2

    hi audioguru. how r u do you remember u recommended using a peak detector and a rectifer circuit to me to fix the output for an ADC. i tried so many times the peak detector circuits and i cant get the reason for using it. i use a adc0804. and the peak circuit just do the sampling duty like the...
  14. hakyman

    wireless transmitter

    hi all what about low frequencies is there any solution without taking the antennas lenght bigger?or is there any type antennas has small dimensions?
  15. hakyman

    Electronic Stethoscope 2

    Hey Audioguru You did again thank you so much for your kind and quick reply again i dont really know how can i thank to you thank you so much i'am gonna out of city for a week time. so i ll send the LF353(jfet) setehescope with a LM386 amplifier after i came back. see you thanks for all
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