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  1. badai

    detector prototype

    after i finish design schematic using EAGLE, i click to BOARD button, then i follow the instruction but when i clcik AUTO button, EAGLE cannot perform this command but on my schematic no error and warning was found. What is the problem? i didn't found this diode symbol BA481(OR NTE112) in...
  2. badai

    detector prototype

    another one is all the grounded components should be connected together to pin 11 isn't it?
  3. badai

    detector prototype

    for R13 at the +ve point it should be connected with pin 4 for IC1. is it right?
  4. badai

    detector prototype

    I'm using eagle editor layout.......for BFR 90A what kind the symbol should i use from library because this transistor not same like common NPN transistor but the symbol from circuit given same like NPN transistor
  5. badai

    Electronic Eavesdropping Devices Detector

    actually i'm a beginner user for EAGLE Layout Editor, so I'm not sure either i draw the layout right or not. Can you send me the pcb design(electronic eavesdropping devices detector), so i can send directly the transparent directly to pcb lab at my faculty?
  6. badai

    Electronic Eavesdropping Devices Detector

    Is it alright if I don't install into the metal box?....... :-\ Do you have any circuit that can detect the signals up to 108MHz(approximately-like tune radio frequency for FM)
  7. badai

    Electronic Eavesdropping Devices Detector

    if using breadboard rather than pcb, do you think it will work properly? if using single wire as an antenna, it will pick up the rf signals?
  8. badai

    detector prototype

    the telescopic antenna........is it the antenna used by tuned radio??
  9. badai

    detector prototype

    the component with series BUZ 90A and BUF 90A, is it both same components???..............
  10. badai

    4 bit binary counter

    hello.......anyone can send 2 me logic diagram for 4 bit binary counter, using NAND gate not AND gate...pls..... ;D
  11. badai

    detector prototype

    actually i hold to build the circuit for a while. so, right now i'm doing few experiment and it still related with the circuit. audioguru, i know you are expert in theory, so can you explain this situation clearly?: a hand phone operating at 1800MHz frequencies, a local service provider using...
  12. badai

    detector prototype

    i learn that EMI will occur when these three elements exist, source of emission, coupling path and receptor. so, i'm using cell phone as a source of emission and tune radio as a receptor. anyone can explain about the coupling path under this condition?
  13. badai

    detector prototype

    i've few questions here: 1-some cell phones today using dual band and tri band type. is it make any effects on the circuit? 2-in my country(malaysia) we using some types of network: celcom(900MHz), adam(1800MHz),digi(1800MHz),maxis(900MHz) and tm touch(1800MHz), so can you explain how these...
  14. badai

    detector prototype

    since my project cover in wide scope, then my supervisor want me to design the detector for detecting cellular phone only. nowadays, we find that some places like in hospital, aeroplane even in exam hall(to cheat) and etc. we does not allow to use the phone to avoid any problem. so, my detector...
  15. badai

    detector prototype

    audioguru, i have look the circuit you suggested before; http://www.electronics-lab.com/projects/rf/005/index.html. do you have any alternative to use IC
  16. badai

    detector prototype

    i have refer back to my lecturer, he said for switched off electrical appliances, we may need UPS or transformer that have high residual electrical power because my project topic is flexible so it doesn't concentrate to certain device. then now, he want me to try at the beginning stage using...
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