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  • en Telephone pulse to DTMF converter MKII

    Description: Some time ago my brother and I made a pulse to tone (DTMF) converter for my old GNT-A F68 telephone, but after I replaced my microphone from an old...
  • en Telephone pulse to DTMF converter

    Description: During a visit to the local recycling station, I stumbled over an old GNT-A F68 telephone, and it was a bargain I could not say no to. When I...

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