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Recent content by kcagiran

  1. K

    Onboard 50 ohm GSM antenna design.

    thanks for replying, designing F antenna is complex and hard, can i find and library for eagle? I mean ready to use F antenna design?
  2. K

    Onboard 50 ohm GSM antenna design.

    Hi, i am working on gsm tracking and phone device, using GSM and GPS on same device. But i am using extended antenna for GSM and GPS connection separately. Now i would like to implement onboard antenna like F for GSM connection. But the problem is my device needs to has strong GSM connection...
  3. K

    GSM Telit GL 865 Dual V2 acoustic echo cancellation with AT command?

    I am working on a device that makes voice communication between machines and human. But the is a problem here. The devices makes acoustic echos, my devices microphone takes voice from speaker and send it back to user. there is 4 cm distance between microphone and speaker. I have to solve this...
  4. K

    [SOLVED] Telit Gsm Module Noise Problem

    .Hi KlausST; My PCB works really good, and huge thanks to your experinces, and direction. Using GND bottom plane is solved all noise and etc. problems. Now i have finished my school with this project, hope one day i can help people like you sir. Huge thanks.
  5. K

    [SOLVED] Telit Gsm Module Noise Problem

    Alright i have super clear understood what should i do/how think i am and what i should pay attention to while designing a PCB. You really open up my horizon dear KlausST. These informations/experiences are priceless. Tuesday my new design PCB arrived and i am pretty sure we will have solved...
  6. K

    [SOLVED] Telit Gsm Module Noise Problem

    I supposed i have gnd plane at top. I defined that top copper pour as GND but now i see its actually not GND plane... You said it before but just right now understand what you mean. the top copper pour that defined as a GND, aint it mean more GND place? If you use top Copper pour GND that will...
  7. K

    [SOLVED] Telit Gsm Module Noise Problem

    Huge thanks for your good advices. The new designed PCB's are about to arrive to me, and when i try it i ll share all experience here. ***By the way, i ll start to design new ''Last design V2'' as soon as possible with your advices. You have been very helpful.. Thank you - - - Updated - - -...
  8. K

    [SOLVED] Telit Gsm Module Noise Problem

    This is my last design, i add decoupling capacitors to VCC for GSM module and i placed it close to gsm as posible. I draw voice lane curved and, SPK+ and SPK- lines have same length. I have calculated the line width for GSM max 2A rule. Hope this pcb has better performance then the previous...
  9. K

    [SOLVED] Telit Gsm Module Noise Problem

    Thank you for answer andre_teprom! yes there is decoupling capacitor and i use this microphone amplifier pcb with another pcb's before. It gives really clear sound. (By the way i tested my main PCB with directly connect speaker and microphone ot many times.) Now started to design new pcb...
  10. K

    [SOLVED] Telit Gsm Module Noise Problem

    Thank you for answer andre_teprom! I am using opamp that name is TL071 for amplifie the electrec microphone. This opamp has only 1 output that name is Mic+. But my gsm module has mic+ and mic-. After my document research, find some informations about it, if you are using only 1 input (Mic+) at...
  11. K

    [SOLVED] Telit Gsm Module Noise Problem

    Huge thanks for be interested sir KlausST! I saved all these priceless notes. And I will implement to my project as soon as possible. You know i need to much time to understand electronics, but need to start somewhere like this. ***I added my EAGLE (brd) and (sch) zip files. If possible i...
  12. K

    [SOLVED] Telit Gsm Module Noise Problem

    Thank you for your answer BigBoss! These tricks will make me better no doubt! Huge thanks again! Yes i have think using private regulators before, but this time i need to design with these components. But i used 100nF decoupling capacitor at regulator output. I thought it ll a solution for...
  13. K

    [SOLVED] Telit Gsm Module Noise Problem

    Thank you for your reply! these are PCB layouts without GND and VCC planes. there are GND planes at bottom and top. Only have a VCC plane at 2nd PCB. Should the GND plane continuous, i mean without any split VCC planes?
  14. K

    [SOLVED] Telit Gsm Module Noise Problem

    Thank you for your reply sir! Here is my schematic, i prefered switch regulator and placed every components which is recommended in telit hardware user guide. In my school my teachers can not give real advice to solve noise problem. They only said to me to choice lineer regulator. But I know i...
  15. K

    [SOLVED] Telit Gsm Module Noise Problem

    I am electronic engineer stundent and i have an iot project thesis. I designed 2 layer pcb that reads inputs and making phone call on GSM. Teorically every single things works well. But there is huge noise when make phone call. I can hear noise PCB's and phone's speaker. I am uploading 2...
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