Building your own pulse dial to tone dial converter for vintage telephones

6 thoughts on “Building your own pulse dial to tone dial converter for vintage telephones”

1. Hello I am just curious the second design schematic on your pulse DTMF tone is different than a month ago. Does this new one work or was it mistakenly uploaded. The Parts list still matches the original revised schematic.

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   1. Good observation!

      They both work. The first one was unnecessarily complicated, so revised and re-uploaded it.

      When I release the gerbers (in the coming weeks) – they will be for the present schematic.

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2. Hello. A Danish F68 rotary dial telephone will add one to every digit dialed. Dialing 1 will come out as 2, 2 will come out as 3 and so on. I have looked through your code but I can’t seem to find a way to subtract 1 from every digit dialed. Could you please help me out?

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   1. A very simple change. You’d replace the code inside the NZ_DIAL define to do that. I’ll take a look at it when I get a chance.

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   2. I had the same problem, but I was able to change the program so it will substract one pulse and it now works fine, I can mail you the firmware if you are interested (I know it’s been a while since you posted this).

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3. Hi,

   Thanks for sharing your Pulse to DTMF converter design. Please could you let me know the license for the hardware and software?

   Thanks again
   Matthew

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