Circuit board help!

[adamray7]

Hi. I am new and I really need help I know absolutely nothing about circuit boards or how they work. I hope this makes sense. You know how phones have a page button? Well that is what I need a board for. I don't need the whole phone circuit board, just the 2 boards for the page button system. Like the speaker one and the one that has the button you press. I don't need the case or anything, justt he boards. How can i go about getting just those specific boards or how do I make them? Then once I get them how do I make them work? Sorry, I really have no clue. I don't really want to say exactly what they are for, but that is what I need. Any help would be greatly appreciated. Thanks! Alicia

 

[audioguru]

A low power paging system is just a microphone and an audio amplifier that drives a speaker. The microphone might need a preamplifier circuit.

Buy a little amplifier kit, buy a little microphone (and a preamplifier kit that matches it) and buy a little speaker.

Then page until you turn blue in your face.

 

[Stellarcore]

Audioguru, I think you misunderstood what he was asking for.

He's looking for something like a keyfinder circuit. Where you have a small button cell powered receiver with a piezo speaker/buzzer and when you push a button on a transmitter board the reciever board sounds a moderately loud beep or buzz which persists until it is canceled by a second transmitter or a reset button on the receiver.

I've been thinking of making a pair of these for my fiance who always looses her keys, but I havent bothered to sit down and figure out the power requirements. I think that it may be difficult to make it last long enough on a single battery, but I could be wrong.

 

[audioguru]

Adam or Alicia (he or she?) didn't mention that the phone is lost. He or she also didn't say it must be wireless.
So what Adam or Alicia needs is a radio transmitter and a radio receiver. If he-she studies electronics for a few years then he-she will be able to design them.

My daughter bought a Chinese keys-finder at The Dollar Store.
She wanted me to fix it because it beeped whenever she talked or whenever the TV was playing. Inside there was a black blob for a special IC, a couple of resistors and a piezo beeper. I couldn't fix it because the special IC was designed wrong.