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  1. keile

    free radio frequency

    what is the radio frequency that is available for use with any electronic devices without the need for a license? after researching this is what i found: 40 Mhz - garage door, alarm system 40-50 Mhz - standard cordless phones 49 Mhz - baby monitors 27 & 49 Mhz - basic consumers items i'm...
  2. keile

    need help in fm transmitter

    hello! i got a very simple fm transmitter yet very stable, low power and have reasonable range (the author claims) i'm having a problem to get it working.. :( I don't know if the 28pF capacitor which is connected to the collector has something to do with the parallel resonant circuit. Also...
  3. keile

    remote control using radio freq

    hello! Our project has been approved and now we need to build our prototype. As I research, our project is basically a radio controlled device. Push a button in the transmitter side and when it was received by the receiver it buzz or light. I know it is quite simple compared to examples shown...
  4. keile

    call timer for mobile phones

    hello again! i'm thinking of a device that would time a call that is separate from the phone. It might use a LCD to display the call time. And I'm thinking of using a Cellular Phone calling detector to detect if a call is still in progress. Its main application will be to inform the...
  5. keile

    nice title

    hello again! My instructor finally accepted the concept of my group project! Hurray! This project is an electronic finder using radio waves to activate the receiver to alarm. A device would be clip to the object and would sound and/or light when a remote control has been triggered. Its main...
  6. keile

    detect broken wire without removing the rubber

    we have a electronic design project in school and i can't think of anything that is low-cost and something unique... well, i think be able to detect a where in part of the cable is the broken wire is quite useful. Is there any way to do this? I'm thinking of using something like X-ray or maybe...
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