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Recent content by orpheus

  1. O

    cheapest micro controller required

    the cheapest micro is taiwanese EMC micro. their EM78P153S is about 0.17usd and their EM78P173S is even cheaper. i already used thousands of them. they are working fine. www.emc.com.tw
  2. O

    non standart 2.2mm 4 layer pcb manufacturer need in china.

    hello all. we need 4 layer fr4 pcb board. but with non standarts stack up. top layer - 35 um copper prepreg - 0.8 mm mid layer1 - 35 um copper core - 0.5 or 0.6 mm mid layer 2 - 35 um copper prepreg - 0.8 mm bottom layer - 35 um copper so total thickness it about 2.2 mm. most of chinese...
  3. O

    Help Need ! about Zarlink ZL10313

    Dear friends; we have a project with satellite tuner. our sharp tuners are using Zarlink ZL10313 qpsk demodulator chip inside. so the problem is; there is very limited information in zarlink website. there is one small datasheet but no information about register adress, and details. in...
  4. O

    Help! need cpld suggestions for reading mpeg packets from

    i need your cpld suggestions for reading mpeg packets from digital satellite tuner. actually the task is very easy but i need speed. - the tuner gives me 8 bit paralel data, clock and packet start output. - every packet starts with hex47 and next 2 bytes identifies the packet.(PID) - every...
  5. O

    Long distance audio transmitting with cable

    Hi all ; i have a project about transmitting audio signals to the long distance ( about 1000 meters ) with cable connection inside a building. there is now way to transmit audio with any RF modulation or optic systems. so i have balance or unbalanced options. i am not the expert of audio so...
  6. O

    Need recommendation for 2.4ghz wireless camere transmitter..

    tsa5055 Dear friends. i'm a newbie in RF design business. now my jos is designing 1000-2400 mhz wireless camera system. i have many experineces at microcontrollers video signals and 433 mhz ism transmitters but still i need advices about 2.4 ghz band. i'm using PLL satellite tuners for...
  7. O

    Help me with designing a wireless auction system

    wireless auction system hi all i am the very beginner in rf systems. i have a project rf based auction system. simly the handheld devices to use in a auction. min 400 devices must work in same room. now i dont have a idea. i think i must use premade modules from radiometrix or rfm etc... i'm...
  8. O

    is there any security diff. between 16f628 and 16f818 ?

    is there any security diff. between 16f628 and 16f818 ? about the code protection ?
  9. O

    i need idea about rf based car control system ( 125khz)

    yes it is like optic based yes it is like optics based. i dont want to use RF signal because of reflections and parasites can be problem. i dont want to use optics because the dust and sun can be problem.
  10. O

    i need idea about rf based car control system ( 125khz)

    hello we have a project about car in/out tracking system ( which car is in park which is out, which car is in which time and out etc.. ) i think to use 433.92 mhz premade modules from telecontrolli or radiometrix. everything is ok to here. but i need a trigger system to the know car is in...
  11. O

    removing code protection pic micro

    read code protected pic hi guys. ok. i'm not drilling my boat. i asked about known methods. not secrets to anyone. i sent many e-mail to microchip about code protection i asked which micro is most secure and what they suggets to me. they never replied me strange. i think a big security hole on...
  12. O

    removing code protection pic micro

    pic code protect hi all. i need idea. some of my products are cloned. they stealed my hex code from chips. i've used pic16f628-04/p chip. i need idea. 1- is the 16f682a is more secure than 16f628 i ask this question because the 16f84a is improved security feature. 2- i readed from this from...
  13. O

    can we use GSM PA and OSC for our transmitter design ?

    gsm pa and osc hi i want to use because this part are very cheap here and easly available. i know there are perfect rf components from motorola mitsubishi hitachi rfm etc... but they are not cheap and i couldn find they easyly. if there is a vco what is the hard part of use it for a local osc...
  14. O

    can we use GSM PA and OSC for our transmitter design ?

    hi all can we use GSM PA and OSC for our transmitter design ? have a idea ? because gsm PAs are very cheap and powerful 2W at 900mhz but i dont know how much db is the gain ans osc control system is it vco ? if yes it is very easy to use gms pa and osc ?
  15. O

    saw resonator transmitter

    hi i need the schematic and information about the sae resonator based audio transmitter i already build a saw based data transmitter but i dont know how can i modulate voice the am or fm ok
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