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Building your own pulse to tone (DTMF) converter – Matt's Tech Pages
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Pulse to Tone Converters - Oldphoneworks – oldphoneworks
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Digital or pulse to rotary dial convertor for antique telephones
Validating the prototype | Details | Hackaday.io
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Amazon.com: Customer reviews: Pulse to Tone Converter (Use Your Antique Rotary Dial Telephone On Modern Lines)
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Building your own pulse dial to tone dial converter for vintage telephones – Matt's Tech Pages
Pulse to Tone Converters - Oldphoneworks – oldphoneworks
