[ntp:questions] PC DCF-77 signal emulation?

Rob van der Putten rob at sput.nl
Thu Sep 10 19:14:30 UTC 2009


Hi there


Rob van der Putten wrote:

> This will probably work;
> 
>                                    +-----> DATA
>                                    |
>                                    |
>                                |  /  c
>             +-----+          b |/
>   TXD >-----+ 4k7 +--*-----*---|    BC547B
>             +-----+  |     |   |\
>                      |     |   |  \| e
>                      |     |      -|
>                     +++  --+--     |
>               47 kΩ | |   /|\      |
>                     | |  --+--     |
>                     +++    | 1N    |
>                      |     | 4148  |
>                      |     |       |
>                      |     |       |
>   GND >--------------*-----*-------*-----> GND

If you want to build four, just multiply the resistor values by four (it 
will probably still work with 10 x these values).

> You have to write software to drive it.

This is for a parallel port;
http://www.captain.at/rtai-dcf77-simulator.php


Regards,
Rob
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