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  1. Shahriar

    TELEVISION

    Dear audioguru The High voltage of the CRT is not dangerous for human. The only thing happen is that it gives you a little shock, because when the FyBack Transformer amplifies the Volltage, It reduces current (Power on both sides of a transformer are equal) The only dangrous section of a TV...
  2. Shahriar

    I want to make a PAYPHONE!!

    Dear Kasamiko Here a circuit with calculator you mean. but It didn't catch my Attention. click on " Telephone call meter using calculator & COB " here is the link http://www.electronic-circuits-diagrams.com/telephones_circuits.shtml HTH, Shahriar
  3. Shahriar

    Increase range of RF Remote control!

    Hi I want to build a device for time measuring in a horse race. A sensor will detect when the horse pass the start point and another sensor detect when the horse pass the finish point. both these two sensor will send a wireless signal to the refrees and so on... The problem is the range of the...
  4. Shahriar

    Monitor, DAEWOO 14", CMC 531X Chasis

    Dear Ante Thank you vary much. :) They are a little bit different. I donloaded CMC 531X from this Link: http://fileshare.eshop.bg ThankX again Shahriar
  5. Shahriar

    Monitor, DAEWOO 14", CMC 531X Chasis

    Hi I Need DEAWOO Monitor -14" schematic. ITS Chasis name is CMC531X. There is a CD on Internet that includes this schematic but they said we can not send it to your country. :-[ Your Help is appreciated in advance Shahriar
  6. Shahriar

    Auto PowerOFF Power Supply!

    Dear MP As I said, I know how to power off the power supply and I know how to use timers. THE PROBLEM IS THAT how I detect that there is no AUDIO or VIDEO signal at the Input. I have think about it and I want to use the following circuit. Although it is not the FINISHED circuit Please tell me...
  7. Shahriar

    Auto PowerOFF Power Supply!

    Hi I have build two laboratory equipment for two English Language Institue. Few days ago, When I went to one of these laboratory, I noticed that the teacher has forgotten to turn the centeral SET off so The VCR connected to the set has reached to the end of the Film, so the TV had Turned off...
  8. Shahriar

    How does Laptop PS work?

    Hi I have two questions... 1- Does anybody know how Laptop power supplies Or Mobile Chargers work? I think they are very similar to each other. They are very small and light. They are very lighter than usual Switching power supplies... 2- There are usually a cylindrical part on the wires which...
  9. Shahriar

    PCB Design/Power supply for board

    Dear vvv I think, at first you should decide what PCB software you want to use... I started with protel DXP, and i learned it from the books accompanied with the software. There are also some books about protel. Eagle is another good software for PCB design, But i don't know whether it has...
  10. Shahriar

    If you are looking for good FM Tx, Look at this Link

    Hi If you are looking for a high quality and professional FM Transmitter you you can visit this site, In this site there are some schematics and PCB and lay out and Fabrication manual that are related to some Transmitter kit from different companies that normally you can not visit schematic...
  11. Shahriar

    Turn the lamp On & Off gradually...

    Hi I Want to build a device which can turn on a 100watt lamp gradually and then turn it off gradually and do this ever and ever. I emphasis that i DO NOT WANT To turn on or off the lamp suddenly, But I want to turn it on and off GRADUALLY. Any help is appreciated in advance. Shahriar
  12. Shahriar

    The thickness of inner conductors differs?

    Hi As you may notice in shielded stereo cables, one of the inner conductor is thicker than the other one, for example one of them has 10 copper conductors and the other one has just 3, Is it really differ how we use them? ThanX Shahriar
  13. Shahriar

    Show something on TV?

    Hi has anybody think about a device which can write something on TV. For example, imagin in an election you want to show the number of votes for each condidate on a large TV so that every body can see it in a large hall. for example we send the video signal through the RCA Jack or connect it to...
  14. Shahriar

    Circuit design and simulator software

    you can download the crack for eagle, here which i have used, but i recommand you to use Protel DXP 2002 or 2004, although many people use Eagle Crack.zip
  15. Shahriar

    Mysterious Resistor?

    *** Thank you very much for your always complete replies ***
  16. Shahriar

    Mysterious Resistor?

    Hi here the answer of your questions... 1- Sorry, TL072 is correct, I misspell it. 2- Yes, in the Original circuit i replace NE5532 with TL072, I have not build this second circuit i just post it to see maybe The 1Mohm(R4) resistor do the same as the 1Mohm I put in the original circuit. 3-...
  17. Shahriar

    Mysterious Resistor?

    Dear Audioguru & MP dear MP, There are so many guys in this forum with lots of information that want to share with others like you, Audioguru, Hotwaterwizard, ... and i really appreciate all of your correct or wrong comments... I replaced NE5532 with TL074 and because they are pin...
  18. Shahriar

    Mysterious Resistor?

    Here is the Original PDF that i substitute TLC72274 with NE5532 and i didn't understan the resistor R24(20K) Texas_Mic_Mixer.pdf
  19. Shahriar

    Mysterious Resistor?

    Hi I have made a preAmp From a datasheet from Texas Instrument that the PDF is Attached, But i Think somthing is missing because when my hand touched the Capacitor (Cx) accidently then i found that i have to Solder a big value resistor between the output of the Capacitor and SGND (Rx), but...
  20. Shahriar

    Circuit design and simulator software

    Dear Uman Software are usually expanded in one branch, I don't think you could find a software to be good at all of them, For PCB I recommand Protel DXP 2002 or 2004, It is very good in simulation too, but for simulation i have heard about 'Circiut Simulator' But not worked with it yet... By...
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