I have a "Luggage Locater" that makes a high freq sound followed by a lower freq sound, which is followed by beeping. I would like to know what is making this sound and if there is any way(mod) to stop it.
http://www.youtube.com/watch?v=4vapK_acBro (Keep watching i show the circuit)
These sounds only occur while the device is switched on. the sounds persist until the button on the transmitter is pushed, at which point the alarm sounds(forgot to demonstrate that in the video.)
I do not know very much about radio control but would like to learn. It seems hard to find a good website or book(from an engineering standpoint). Any recommendations? I would like to completely learn how this circuit works and maybe even create one of my own. (and of course expand on it) this seems like a good starting point.
Thanks so much!
RHubert787@ymail.com
http://www.youtube.com/watch?v=4vapK_acBro (Keep watching i show the circuit)
These sounds only occur while the device is switched on. the sounds persist until the button on the transmitter is pushed, at which point the alarm sounds(forgot to demonstrate that in the video.)
I do not know very much about radio control but would like to learn. It seems hard to find a good website or book(from an engineering standpoint). Any recommendations? I would like to completely learn how this circuit works and maybe even create one of my own. (and of course expand on it) this seems like a good starting point.
Thanks so much!
RHubert787@ymail.com
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It is most likely a microprocessor with a program that determines how it operates. The video doesn't show much to help without much higher resolution. There is probably some interaction with another companion unit that goes into the luggage so it can find it.
Sometimes the numbers on the ICs can help, but most likely it is a program in a uP chip.
I see a coily wire hanging off an end most likely used as an antenna. One of the chips is most likely a transmitter & receiver to communicate with the companion piece in the luggage. Taking a wild guess, it may even be the XE1201. If it is, it operates somewhere between 300 and 500 MHz.
I see what looks like an inductor (black thing near the center by the battery), possibly for louder beeps in the piezo beeper - that disk thing barely visible on the inside of the case.. I see a quartz crystal on the back side most likely to determine the radio frequency used. IC numbers are necessary and crystal frequency may help, if appropriately marked. However, the sequence of events is most likely a series of instructions in the microprocessor program.
Lots of electronics schooling and experience allows me to figure out things like this all the time...
Send me all the numbers off the IC's and I'll tell if any more can be gleaned...
Sometimes the numbers on the ICs can help, but most likely it is a program in a uP chip.
I see a coily wire hanging off an end most likely used as an antenna. One of the chips is most likely a transmitter & receiver to communicate with the companion piece in the luggage. Taking a wild guess, it may even be the XE1201. If it is, it operates somewhere between 300 and 500 MHz.
I see what looks like an inductor (black thing near the center by the battery), possibly for louder beeps in the piezo beeper - that disk thing barely visible on the inside of the case.. I see a quartz crystal on the back side most likely to determine the radio frequency used. IC numbers are necessary and crystal frequency may help, if appropriately marked. However, the sequence of events is most likely a series of instructions in the microprocessor program.
Lots of electronics schooling and experience allows me to figure out things like this all the time...
Send me all the numbers off the IC's and I'll tell if any more can be gleaned...