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cyberc Posted - Apr 15 2010 : 10:20:06 AM
Hi

I copied this simple setup between 2 old analogue telephones: http://communication.howstuffworks.com/telephone4.htm

It works perfectly, however, it is very quiet when listening. This makes no real difference over 10 meters or 100.

Is there a simple way I can increase the volume perhaps by increase voltage or changing the resistor? I know our local telephone network actually runs on 12v - I am just nervous to try and break the phones.

Thanks

Rod

(Edit...Move to Telephone)
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audioguru Posted - Apr 15 2010 : 9:54:03 PM
You found an extremely simple circuit. Most extremely simple circuits work poorly.

In Canada, the phone network runs off 48V to 50V, not 12V. A phone draws enough current to drop it to about 8V. If the circuit does not limit the current then the phones might burn up.
A phone line does not use resistors that reduce the levels, instead it uses transformers that pass audio without loss and pass DC to the phones.

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