The original microphone output was probably about 10 millivolts with
normal voice levels. That should certainly get you in the range of
operation.=20

Shouldn't you run the transformer in the other direction (6:1)?

Bob

On Thu, Oct 11, 2012, at 02:09 PM, Alexander Winnig wrote:
> Hello
>=20
> I want to connect an external audio source to my telephone's microphone=20
> cables(signal and mass) for it to act as the microphone. To make this=20
> clear, I am talking about the connection between my telephone(siemens=20
> euroset 2020) and it's handset, ie I bought a new cord with a 4p4c plug=20
> at each end, cut it through, connected the 4p4c plug with the socket in=20
> my telephone and figured out which two cables of it go to the microphone.
>=20
> For this I want to know which max. voltage level I should aim at for the=
=20
> audio source.
>=20
> I decided to put an audio transformer (1:6) between audio source and=20
> microphone connection, so I need to know the max. voltage of the audio=20
> source before the transformer.
>=20
> Best regards
>=20
> Alex


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