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  1. Z

    Prevent audio leaking

    I have build the given one. But sensitive bit low when low audio input. I did change bit and now sensitive seems fine. Thank you. - - - Updated - - - At the moment some of this resistors doesn't have with me. Once I find ,will make this too. Thank you sir.
  2. Z

    Prevent audio leaking

    Thank you very much sir. Tomorrow I'll make this one too and reply. Appreciate.
  3. Z

    Prevent audio leaking

    Thank you very much sir. I'll make this one and will post the result. BTW, **Is that resistor 10 M or 10 K from the input (Mic input) ? ** Can I use BC 547 (PNP) and BC557 (NPN) for the transistors? ** Is there any option to adjust sensitive? If you can attach clear image really appreciate.
  4. Z

    Prevent audio leaking

    Thanks for the reply. But I couldn't find any solution for the leaking audio to power source. Finally decide to supply individual power supply (Rechargeable batteries) to each audio sensor circuit. Ohh.. God why this audio electronics become more difficult to me...:-( - - - Updated - - - I...
  5. Z

    Prevent audio leaking

    Sorry it has to corrected as More sensor to more sensitive? Any one please give me any advise on this matter..
  6. Z

    Prevent audio leaking

    Level means sensor level. I mean if audio sensor can be more sensor (adding some transistor to amplify 1 stage), is good. Power source- Its 12V to 5 V regulated power supply. Whatever power source used its leaking audio to power source. I check with signal tracer...
  7. Z

    Prevent audio leaking

    Hi There, I'm working for a design which light LED when its detect audio input to the circuit from a mobile phone. There are few same design doing the same thing. Detect audio and light LED is fine but the problem is Audio sensor circuit leaking audio to power source. I have check with Audio...
  8. Z

    [PIC] Interface Sony Ericsson K750i with PIC Microcontroller [HELP]

    Finally Got it work with Proteus simulator. But with the same hardware setup it doesn't dial number.
  9. Z

    [PIC] Interface Sony Ericsson K750i with PIC Microcontroller [HELP]

    Hi there, I'm a newbie and tried to dial a no from MCU (16F887) to Sony Erricsson K750i. With hyper terminal connected with data cable to pc it works AT commands fine.But I couldn't communicate SE750i with MCU. I have attached schematic I used (drawn by me) and the flowcode program that I used...
  10. Z

    Need help to dial a mobile phone from PIC microcontrller - Flowcode

    Thanks for the reply. This phone has TX and RX pins. Also this one chines dual sim. But I heard AT commands responds to probably DEFAULT SIM1.
  11. Z

    Need help to dial a mobile phone from PIC microcontrller - Flowcode

    I need to dial mobile phone from PIC micro controller (Flowcode). I made simple Flowcode program and try to execute by R232 connection. But no luck. Here with I have attached the program and the PIC module made by me ( For testing needs). Please make correct me if I made any mistake for this and...
  12. Z

    [SOLVED] Echo canceller Schematic

    Sorry for my mistake. Wrongly placed transistor. You know what ALERTLINKS it works .....................:grin::grin::grin: Audio quality superb !!!! With certain settings echo was 100 % eliminated. Thank you very much for this and I really appreciate. WIsh you a bright future.
  13. Z

    [SOLVED] Echo canceller Schematic

    Are you sure schematic does not short electricity. I stuck with some short circuit position. Pin 4 get +46.6 V. Transistor base has the same voltage without connecting GND to circuit. Please have a look.
  14. Z

    [SOLVED] Echo canceller Schematic

    - - - Updated - - - I'll test this and update now. Is that 470pf or 470uF in series with 18k? Thanks you.
  15. Z

    [SOLVED] Echo canceller Schematic

    Happy to hear that :)...
  16. Z

    [SOLVED] Echo canceller Schematic

    I'm bit confused. Freetalk has 1 output (Regular Phone) and 1 input (Telephone line). So connecting this schematic to telephone line does not make any sense. Because I'm saying when skype call received only regular phone rings and I checked other line (telephone line) whether giving any signal...
  17. Z

    [SOLVED] Echo canceller Schematic

    It has to be corrected. During the GSM call remove mic terminals. So the GSM line active. What I mean is GSM side receiving quality audio with schematic but not for Skype caller audio. Seems it has to optimized. Will test and update you. Update : I put 470uF and tested. Both sides can hear...
  18. Z

    [SOLVED] Echo canceller Schematic

    Here it is - - - Updated - - - Is it possible to add some transistors switches to receiver and transmitter with fine tune? Usually in a telephone call both sides are not talking same time. When GSM mic input received audio signal then transmitter (Skype caller audio) should disconnect and...
  19. Z

    [SOLVED] Echo canceller Schematic

    I have tested as you mentioned. When mic (GSM) is not connected skype caller audio never comes clear. With the variable resister settings its increasing and decreasing. But its not going smooth flow. Some certain point its increasing around 30%. However I able to get some point which skype...
  20. Z

    [SOLVED] Echo canceller Schematic

    I did remove 33k and played with many settings. 0% of 100k point to telephone line side reduced some echo. With that mic and speaker adjustment able to eliminate ech0 100% but other side (skype) does not hear anything. If skype side hear (low quality) then GSM side appear mass echo with clear...

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