Cell phone as a 2 way intercom

[Riaan]

HI all.

I want to use a old Nokia 1200 as a door phone, the speaker part is easy to build but to get audio back to the phone is a problem. It seems as some thing is clamping / clipping the signal from my pre amp. Any ideas would be helpfull

Regards
Riaan

[AJISH ALFRED]

Hi Riaan,

This is interesting, please post your circuit diagram so that we can discuss more about what exactly the problem could be.

[Author]

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