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Fig. 28: TFE module
2.5.2
Interfacing of a simple door phone
Figure 29 illustrates the connection of a door phone equipped with a micro-
phone and speaker. No door intercom amplifier is required for this connection.
The bell transformer is used only for the door opener and the operating signal
lamp. The interface connections at the door phone and bell transformer should
only be seen as examples. When the doorbell is rung, the call is signaled at all
terminals entered in the TFE call mode. If you configure an answering machine
in the call mode, the party at the door will be able to hear the answering machine
message.
Technical Data for the Modules:
Speaker
> 8 Ohm, approx. 2 Watts
Microphone
Dynamic microphone, or Elektret microphone with built-in pre-
amp.
Doorbell
Potential-free button
Operating signal
Example only. In this case, this lamp will light up when the door
lamp
intercom is activated. The data for the lamp depend of the out-
put voltage available at the bell transformer.
LED
So c ket c o nnec to r
M o unting ho les
39
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