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  1. bilgekaan

    gsm module powered with battery

    Hello, I want to power a gsm module with a battery.Which is the efficent way to do.1 ) Connecting battery directly to module ? 2 ) Connecting battery to module via dc dc converter . Which achives longest life time? I want to use Lithium-thionyl chloride. I am waiting for suggesions. Thanx .
  2. bilgekaan

    capacitor for maintaning peak current

    Hello, I am using 3.6 V lithium battery for gsm application.But battery cannot maintain peak currents during transmit and modul goes to reset. I am thinking of putting large capacitors in parallel to battery maintain peaks. Is it Ok? or not .Disadvantage ? I am waiting for suggestion...
  3. bilgekaan

    nc reed switch wiring

    Hello, I want to count rotating freq of an object using normaly closed reed switch.My circuit will be powered from battery , I detect the pulse when swicth is opened and I want to drive current only when switch is open.What is the correct wiring for this kind of switch? Best regards, Bilgekaan
  4. bilgekaan

    optical port for meter reading

    Hello friends, I need schematic for optical port adapter.There are commerical optical ports in the market ,but too expensive.How can ı build one?
  5. bilgekaan

    sim300c echoing at commands

    Hello, I have sim300dz module on sim300c eVB 2.01 board. When I poer up board, I receive call ready message.İf I try to send At commands , board is just echoing At command I sent . Not responding my commands. I Am usşng only RX and TX signals.Not using control signals( RTS ,DTe ,,etc) . What I...
  6. bilgekaan

    Problem with sending dtmf over pmr radio

    Hello, I am trying to send dtmf signal over pmr radio. I am missing some dtmf codes in the receiver side.I checked the signals in the receiver side with a scope. I saw that signal is corrupt ( corruption is observed at the end of signal ). I attached scope snapshot. Blue is correct signal...
  7. bilgekaan

    clock sharing between two ic

    Hello, I want to use only one xtal to drive two different ic. ( HT92000 & HT9170 ). In the reference schematic two 20 pf capacitors are connected to xtal for both two chip. I see in the holtek forum that , to use one xtal , x2 of first chip must be coupled with 30pf capacitor to x1 of second...
  8. bilgekaan

    mixing audio channels & seperating them at the target

    Hello , I want to mix six channels of audio(stereo is prefered) on an single line and carry them using a wire and then want to seperate them or tune to one of them at the target. Any suggestions,or links or start up information is wellcome br bilge
  9. bilgekaan

    how to align wire with pads

    Hi, When I tried to route pcb manually , I could not align wire with pads. Wire always start out of pad bounds.(look at the pictures) How can align them ? Which settings is used for this?
  10. bilgekaan

    why drill holes are not visible

    Hi All , I draw simple schematic with protel and generate gerbers.But drill holes are not visible in bottom layer ( have a look at image ) How to generate bottom layer with drill holes? Bilge
  11. bilgekaan

    mbf200 finger print sensor

    Where can I buy this sensor ? are samples avaliable?
  12. bilgekaan

    eagle library loading

    eagle use library when using eagle How to load all libary files ( *.lbr ) automaticly? When trying to use library from library->use only single selection is avaliable. it is mouring to use a part when you dont know libary it is located.
  13. bilgekaan

    req Design with the PIC18F452 Microcontroller

    looking for Embedded Design with the PIC18F452 Microcontroller written by John Peatman upload it please
  14. bilgekaan

    web cam microcotroller interface

    webcam microcontroller did any one try to interface webcam ( ov511 with built in usb ) with microcontroller . have any documents or is there any special protocol for this
  15. bilgekaan

    5 phase stepping motor

    cds8a also i have cds8a-6 stepper but i have no documents and datasheets does any know something about it at least manufacturer
  16. bilgekaan

    thermal printer microcontroller interface

    thermal printer interface I have two thermal printers unassembled from pos machine. One is Epson M-190 and second one is Fujitsu ftp-622mcl303 . Does any one have info about these printers ( schematics and connection diagrams and timing info )

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