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  1. Shahriar

    Universal Laborator System!

    ;D ;D Yeah, I am Going to build it.  ;D Although I didn't understand anything, but I thank Audioguru, it is very good for a start! Shahriar
  2. Shahriar

    Universal Laborator System!

    Hi Imagine you want to build a Laboatory System which has a common Shield cable through all Sets.The system should have the capability of talking persons to each other seperately. I mean in the following System with 4 Sets, Person No.1 wants to talk to No.3 and No.4 Wants to talk to No.2...
  3. Shahriar

    sensitive parabolic michrophone

    Dear AudioGuru Go to this project in Project section. "Amplifier 2x30W with STK465 " at the bottom of the schematic I have attached, in 8th line, it is written: "Finally, at the same time with the exit exists networking RC (0,1mF - 4,7 Ohm) that it attends to the minimisation of phenomenon ...
  4. Shahriar

    Send Data to PC Via USB Port Using an AVR MCU?

    Dear Yogi ThanK you for you reply. I have found an IC "PDIUSBD12". I have not tested it yet, but it sounds good ThanX Shahriar
  5. Shahriar

    sensitive parabolic michrophone

    Dear Audioguru On a circuit explanation, I remeber that was written that the 10 Ohm resistor and the cap are to decrease Cross over Phenomena!!! I don't know how? Does the resistor and cap play any roll in Cross Over either? ThanX Shahriar
  6. Shahriar

    Horn Sound when The mic is close to LoudSpeaker!

    Thank you very much. Don't you know that if experts can overcome this problem by Digital Sound processing Tricks? To examin this I conected my Mic to my Sound Card and then Increase the Speaker Volume. The same thing happened to it too. But I am Not sure if my Sound card is Based On Digital...
  7. Shahriar

    Using a pc monitor as a tv

    Hi In My area there is a Chinese device that has a RF (TUNER) Input and a VGA Output and you can Convert your minitor to TV, It has also an RCA Input. It's name is Combo-TV. It is not very expensive in my area about 18$. HTH - SHahriar
  8. Shahriar

    Horn Sound when The mic is close to LoudSpeaker!

    Hi I have built a PreAmplifier and a Power-Amplifier and it works Very good when I coonect my PC output to it. When I connect My Electric Mic to it and Increase the volume, a Sound Like a horn appears On the Loud speaker.This also happen when mic is Close to LoudSpeaker. Let me tell My...
  9. Shahriar

    100Hz TV???

    Yeah, That's it!  ;D Thank you very much Shahriar
  10. Shahriar

    when should use FPGA?

    Dear gogo Thank you for your reply! I asked the same question from a FPGA Expert that I found his email in his website http://www.fpga4fun.com This is what he asnwered: Use a MCU when you need to do something once in a while, use an FPGA when you must do something continuously. For example...
  11. Shahriar

    100Hz TV???

    Hi When I go to market, I see some modern TVs which is written on them: " 100Hz Scan " My question is when the Transmitter sends 50 Pictures per second, then How they show 100 Picture per second? ThanX Shahriar
  12. Shahriar

    Long Range Remote Control (The problem of many People)

    No, Building a good one for customers is impossible for me! I bought one which was made in Taiwan with a SAW filter and lots of SMD Components! HTH  - Shahriar
  13. Shahriar

    when should use FPGA?

    Hi, My question is: when should the project use a microcontroller, or when should it uses FPGA? Can you provide a good example of the project. The project that comes to my mind are:             a.  A pong game using LCD interface and push buttons.             b.  A stepper motor controller...
  14. Shahriar

    Send Data to PC Via USB Port Using an AVR MCU?

    Hi Does anybody know How is it possible to send some data to PC via USB Port Using an AVR MCU. I think this is the problem of so many people. ThanX in advance Shahriar
  15. Shahriar

    A vizz Appears on Telephone line when I connect the serial port!

    ThanX a lot So I am going to test both of them, First I will use two upto Isolator to connect the Serial Port pins to my device  and then try a 600 ohm transformer. ThanX again Shahriar
  16. Shahriar

    A vizz Appears on Telephone line when I connect the serial port!

    Hi I have built a device which shows Caller ID on PC via Serial port. that works properly, but the problem is that when as soon as I connect the serial port to my device a Vizz(bad sound) apears on telephone. the serial port has the same GND with telephone line and other pins of serial port...
  17. Shahriar

    The Triac doesn't turn off when I connect it to DC voltage!

    Thank You very much Shahriar
  18. Shahriar

    15A Lead Acide Battery Charger!

    Oh sorry, I meant Ante, I mis spelled it with Alun
  19. Shahriar

    Why the Isolted 130V in Tv give us a shock!

    Dear 2old4digital You Mean If I touch ONE(?) Pin of a fully charged Capacitor {charged with more than 100 Volts} then It gives me a shock?  ???  ??? ThanX Shahriar
  20. Shahriar

    15A Lead Acide Battery Charger!

    Dear Alun It is a 150Ah Battery, Can you tell me how  much current do I need to charge it, and what kind of Power supply I need to Charge this battery? ThanX in advance Shahriar
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