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Old 14th Sep 2021, 5:45 am   #6
dagskarlsen's Avatar
Join Date: Jan 2008
Location: Hakadal, Norway
Posts: 584
Default Re: Siemens W28 telephone

The w28 has a 200 ohm balance resistor in the windings, this makes the transmitter's voltage pretty limited, and you have to find a Local Battery (LB) transmitter capsule to get it working well, alternativly you have to do som soldering and add a resistor or Capacitor or even better a combination, I did so with another phone based on the same circuit:
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