Help/ Ideas on micro beeping transmitter & receiver - Electronic Circuits Projects Diagrams Free

jshelley · 10th September 2006, 10:08 PM

I need to build a transmitter of some type, very small. Preferrably one that simply emits a beeping noise that is audible only to the receiver. The receiver size is not terribly important, only that it is portable/handheld. The transmitter will have to be light and be able to fit into the end of a ball point pen for example. The range will not have to be very far, maybe 300 feet or so. Is this going to be possible? I have thought that maybe even some form of a magnetic field detection receiver might work, but I don't have enough knowledge in that area. Anyone have any ideas?

mramos1 · 10th September 2006, 10:36 PM

Not far maybe 300 feet. That is a long way? Using magnetic feild? Fit in the end of a ball point pin?

I will take one too when you have it made.

What are you tring to do, maybe there is a better solution?

audioguru · 10th September 2006, 10:41 PM

He is probably another terrorist, but he doesn't like to blow himself up!

mramos1 · 10th September 2006, 10:46 PM

Ahh. Explains the 300 feet. 100 should be safe.

I do not think they will let you on planes with a ball point pen anymore either though.

audioguru · 10th September 2006, 10:50 PM

A bunch of terrorists might all get together with their ballpoint bombs and blow themselves up and cause a lot of damage. Why don't they do it in the middle of a desert??

zachtheterrible · 11th September 2006, 12:53 AM

So, u just wanna hear a beeping noise over your receiver? I'm guessing that you actually want to be able to find the direction of the beeping.

Check this out: http://www.jbgizmo.com/page23.html

Not sure that the transmitter will fit inside a ball point pen. I've built the regenerative receiver and it works great! If you want better range, you would probably want to build the superregenerative receiver, plus you can hear airplanes with it! A regular FM radio would probably allow you to hear the beeping though.

Build the transmitter first, and then decide if you want to build the superregen.

mramos1 · 11th September 2006, 01:40 AM

Audioguru:

Or they are looking to take out paintball friends by giving them free pens before the game.

10th September 2006, 10:08 PM	(permalink)
jshelley New Member	Help/ Ideas on micro beeping transmitter & receiver I need to build a transmitter of some type, very small. Preferrably one that simply emits a beeping noise that is audible only to the receiver. The receiver size is not terribly important, only that it is portable/handheld. The transmitter will have to be light and be able to fit into the end of a ball point pen for example. The range will not have to be very far, maybe 300 feet or so. Is this going to be possible? I have thought that maybe even some form of a magnetic field detection receiver might work, but I don't have enough knowledge in that area. Anyone have any ideas?

10th September 2006, 10:41 PM	(permalink)
audioguru Experienced Member	He is probably another terrorist, but he doesn't like to blow himself up! __________________ Uncle $crooge

10th September 2006, 10:50 PM	(permalink)
audioguru Experienced Member	A bunch of terrorists might all get together with their ballpoint bombs and blow themselves up and cause a lot of damage. Why don't they do it in the middle of a desert?? __________________ Uncle $crooge

11th September 2006, 12:53 AM	(permalink)
zachtheterrible Experienced Member	So, u just wanna hear a beeping noise over your receiver? I'm guessing that you actually want to be able to find the direction of the beeping. Check this out: http://www.jbgizmo.com/page23.html Not sure that the transmitter will fit inside a ball point pen. I've built the regenerative receiver and it works great! If you want better range, you would probably want to build the superregenerative receiver, plus you can hear airplanes with it! A regular FM radio would probably allow you to hear the beeping though. Build the transmitter first, and then decide if you want to build the superregen. __________________ I'm no electronics god, i just talk too much.

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10th September 2006, 10:36 PM	(permalink)
mramos1 Experienced Member	Not far maybe 300 feet. That is a long way? Using magnetic feild? Fit in the end of a ball point pin? I will take one too when you have it made. What are you tring to do, maybe there is a better solution?

10th September 2006, 10:46 PM	(permalink)
mramos1 Experienced Member	Ahh. Explains the 300 feet. 100 should be safe. I do not think they will let you on planes with a ball point pen anymore either though.

11th September 2006, 01:40 AM	(permalink)
mramos1 Experienced Member	Audioguru: Or they are looking to take out paintball friends by giving them free pens before the game.