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T O P I C    R E V I E W
cyberc Posted - Oct 09 2008 : 07:44:19 AM
Hi

I followed the instructions according to this website http://communication.howstuffworks.com/telephone4.htm

to hook up 2 telephones. It worked perfectly over a few meters. On the same telephone cable over 100 meters - this fails. Should I increase the voltage?

Thanks

Rod

(Edit...Move to Telephone)
3   L A T E S T    R E P L I E S    (Newest First)
Aaron Cake Posted - Oct 12 2008 : 10:46:03 AM
The phone system floats around 40V on hook, and drops to about 10-12V off hook. You need more voltage and probably a bit more current then a 9V can provide.
cyberc Posted - Oct 10 2008 : 09:36:42 AM
Thanks

But given it works perfectly over a few meters, it must be an academic exercise to make it work.

I need Mickey Mouse setup as I have no electrical skills.

Rod
audioguru Posted - Oct 09 2008 : 8:57:55 PM
A telephone exchange applies current-limited 50V to each telephone. It does not connect two telephones in series and does not use a 9V battery in series.
You found a horrible Mickey-Mouse circuit.

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