LED to Sound...

Feb 11, 2004 5 Replies
A

Hello folks,



I have a Telephone Caller ID unit with a Light Emitting Diode (LED) that flashes when someone calls me whose number is stored in the telephone directory of the ID unit.



Is there a Very easy way I could solder something up so that as well as or instead of the LED flashes that it rings some kind of loud piezo loudspeaker or buzzer or bell so I could get sound as well?



Anyone know what I would need. The voltage going to the LED would be so tiny wouldn't it so I would really have to bump up that voltage to make a buzzer sound wouldn't I?



Thanks,



Andy.


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N

tiny

buzzer

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A

Thats a good Idea I might try that, Thanks.

or

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C

It's possible to get 10mA Piezo sounders (just make sure you get one with built in oscillator/drive). Just connect in place of the LED.

tiny

buzzer

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M

You could use the phone line its self. I think the line voltage will change when the phone rings and will change again when the phone is off the hook? Just a thought. Might not be to easy though. Mark

or

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A

Not recommended, the regulations on telephone equipment are quite specific.

However, using a tuned photosensor may be the way to go. You can use LEDs as sensors (for example, a water-clear red LED will sense yellow/green light, etc).

-A

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