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

Rob van der Putten rob at sput.nl
Thu Sep 10 18:39:59 UTC 2009


Hi there


Pete Ashdown wrote:

> The clocks take input from a module like this:
> 
> http://clausurbach.de/shop/product_info.php?info=p50_dcf77-module-for-our-nixie-clock-kits.html
> 
> It looks pretty much line an antenna to me.  So what I'd like is a preferably
> cheap option to duplicate that signal to wire directly to the clocks instead,
> sourcing from my Linux box.

This will probably work;

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

You have to write software to drive it.


Regards,
Rob
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